Linuxcnc step scale 6666 # these are in nanoseconds DIRSETUP = 2500 DIRHOLD = 2500 STEPLEN = 5000 STEPSPACE = 5000 STEP_SCALE = 33. LinuxCNC can do all that is required. In case of rotation, machine unit = 1 degree. The doc seems defective in that "length unit" means "revolution" in velocity mode, the units are per second, and it shouldn't be overloading the name "position*" for velocity things (haven't seen so much overloading of variable names since 1975 when I was keypunching FORTRAN card which keeps the motor position locked to the step count, and EMCs loop would mainly duplicate the drives PID loop. I had them sitting on the bench and they sounded beautiful, then i plugged them to my machine and they were very jittery with what I thought was the right step scale. make-pulses base-thread addf stepgen. position-scale %f \n"% (self. I have been away from cnc for about ten years and trying to improve my hobby of using Linuscnc. 8 # Si vous modifiez ce fichier, il sera # écrasé quand vous relancerez PNCconf [EMC] MACHINE = CNC-BF16 DEBUG = 0 VERSION = 1. gain float in scale. The stepgen docs say position-scale is "steps per length unit". 2 but if it only works on whole steps then it will be 3 @ 0. Thanks for your answer. The machine has less than with both you mean the step scale and encoder scale i suppose. 667 So my Servo motor has 10. e. This is a simple physical limitation, that is you cannot issue steps faster than the 1/(steptime+stepspace) limit without violating the timing. The near. position showing (using Hal Show), and the Linux position matches the external Ditron DRO, so getting the linear scale Regarding speed: I am limited to 20 meters/minute for my setup because that's the maximum speed of the 1-micron scales, so I set LinuxCNC to 18 meters/minute to have some headroom. 888888 steps per degree So i would enter 138. If i now go ahead and change a direction parameter on my servo drive to reverse Larger steps than these will lose control of physical precision. 163. I used halmeter to verify the jog speed scale in the 2 modes and found : selector Position Jog. There must be some errors in pncconf with scale calc. But you have to remember most if not all of those are micro-stepping drives and this is a half step drive (400 steps/rev). The scale will be set in the file The final output is a single number in the INI called STEPGEN_SCALE which is the number of step pulses LinuxCNC requires to move the axis by one machine unit. STEP_SCALE = 8000 I don't understand how it works at the moment with it @ 1600 - the angular position the C axis moves to is correct ( except for the 180. One gantry is controlled by WinCNC and the second gantry is controlled by LinuxCNC. yml FULLSCREEN = Could it be that something has changed within Linuxcnc its self before it passes the "Sxxxx" value back to the mesa hardware. 3k. Typical is 200. 667 setp hm2_7i95. Should the drive still be looking for full scale then of 50000? If the drive is set for 50000 steps (or quadrature edges) per turn then the stepgen scale should be 12500 if the stepgen is in It's a "5um" scale, ie 200 counts per mm presumably. offset float in scale. STEP_SCALE = 4000 - in PnCconf built configs Specifies the number of pulses that corresponds to a move of one machine unit as set in the [TRAJ] section. (Multiple boards can be "daisy-chained" together, if needed, on the same parallel port for more axes. 0 MAX The maximum requested step rate is the product of an axis' MAX_VELOCITY and its INPUT_SCALE. 1 [DISPLAY] #DISPLAY = axis DISPLAY = gmoccapy POSITION_OFFSET = RELATIVE POSITION_FEEDBACK = ACTUAL Run/Step Hold/Resume Buttons. update-freq servo-thread ok never mind, I changed the pulse width back to 10000, the step scale to 5000, the step len to 2000 and the step space to 2000 and it doesnt run away anymore. 25mm thread pitch, scale comes out of wizard as 320. . 0 MAX_LIMIT = 999999. The maximum step rate is not related to latency (and about 12. For example a 60 tooth gear with two teeth shortened to form an index so that there are 58 pulses per revolution would use a position-scale of 60 and I'm calculating the step scale to be at ~1700 with 1 and 2 inch per second automated jog movements. 003125 mm and to increase of decrease movement by 0. I believe for configuring your rotary axis you need to specify the axis scale in steps/degree (or what ever angular units you are configuring the machine to use. position feedback in hal must be tied to stepgen-fb in the hal file (net x-pos-fb <= [HMOT](CARD0). If higher rates are needed, a In my case it is 1. 1 [DISPLAY] DISPLAY = probe_basic CONFIRM_EXIT = False CONFIG_FILE = custom_config. And yes that is the correct way to do it. The maximum step rate depends on the CPU and other factors, and is usually in the range of 5 kHz to 25 kHz. 1kw S&D servos; drives set/tuned internally to be as stiff as possible without noise/vibration; 1um glass scales But given a typical 5 micron pulse width in an optical scale, "slow speed" is going to result in poor performance, or be impossible if your motor steps are more than 5 microns. I know it seems like they need tuning but I think it may be linuxcnc and how it is setup. I have a 6i25/7i76 combo connected to Leadshine DM556 drivers in LinuxCNC Forum. 444 steps/mm = 320K steps/s 1/(2500e-9+2500e-9) = 200K maximum step rate (2500 is in nanoseconds) You don't need to change the scale, just reduce the Y/Joint3 max velocity so something The signal flow is scale -> PID -> step gen ~> DYN2. The maximum requested step rate is the Steps per revolution - is how many stepper-motor-steps it takes to turn the stepper motor one revolution. In practice, it means that you may be able to control to within perhaps +/-10um realistically. 8 image, clean configuration using pncconf, on a totally different PC. encoder. n. speed-out and run it through a limit2 component with the scale set so it will ramp the rpm from spindle. X and Y 2000 steps on the encoder. I have a DM542T at step time = 5050 step direction = 5050 direction hold = 500 direction setup = 500. 0025mm). It can also generate full-step drive waveforms stepgen is used to control stepper motors. I have been trying to figure out the input scale. gaeldk; Hello, once again I am struggling with my ATC, the motor, which is setup as an angular axis, oscillates after each move, and never stops oscillating after a With LinuxCNC loaded, open a terminal window and type: halcmd show pin. Toggle Navigation Remember Me LinuxCNC. This works and is correct with my jog motion. 0 maxaccel 0 stepspace 0 steplen 10000 I'll change the steplength and step space to 1000 and position-scale to 7. SYNOPSIS loadrt scale [count=N|names=name1[,name2]] FUNCTIONS scale. ini file) Note that in mode 2 you should set all the step timings short (say 100,100,100,100 ns) Also AFAIKR Clearpath suggests not using differential wiring so connect the 7I76E Step/dir connector +5 to the Clearpath stepgen. The Z axis is a generic Chinese glass scale (from HXX in my case) and the X axis is one of the miniature magnetic scale that fits inside the cross slide (invisible!). encoder. 200 steps per motor rev * 2 for half stepping 400 400 * 6/1 gear reduction = 2400 / 360 = 6. Continuous operation gives a jog speed far too slow. Exactly what is worse with the tune when you have the linear scales feedback connected? Start by testing the servo's movements with the linear scale and the normal Mesa open loop stepper configuration, except connect the feedback from the linear scale to "joint. so far with some P I get it to land on the right spot, but it does it extremely slow so far My gut is pointing to option 2 with tuning of the PID or as-of-yet not found settings to get rid of the square form behavior and the spindle actually being eased down from a speed (so something in linuxcnc controlling the pulses/second in some form of scaling function rather than flooding them or turning them all off instantly. Can not get step settings that works OK Configuring LinuxCNC. Finally ready to wire up the control panel for my Retrofit Bridgeport Boss5 mill. Am totally blown away by LinuxCNC and the people who make it what it is - so thanks in advance. Mesa: 7i95 Joint 3 = Achse Y Mikroschritte: 1/2 (1zu1 kann mein Treiber nicht) Motor: 1. Your step scale is _way_ too low For example if you have a reasonable microstep ratio like 16 (3200 steps/turn) the scale would be: 16*200/5 = 640 16 = microstep ratio = microsteps/full step 200 = full steps/turn 5 = mm/turn pitch I have 5um scales on both X and Z axes. I also add a capture of the driver scopes. Closed loop with steppers. out float out. Toggle Navigation Remember ("setp %s. stepgen. Does the drive work ok in open loop mode? (setup like a step motor)? If you still want to try using EMC to close the loop, I see at least 2 errors 1. N. PnCConf Wizard. 8Ghz, 1GB Ram, onboard video. the P value must be 1000 in the ini file 1. A step rate of 15 microseconds to this drive would actually be commanding your motors to turn at 10,000 RPM (if I did my math right). maxvel is too big for current step timings & position-scale, clipping to max possible. ini files to make a five axis set-up, how do I make sure Y and Y 2 axes move in harmony. The scale should be 130048 steps per inch (this will be called STEP_SCALE in the . position and it will work fine, but your drive will not see step pulses that short. 000 pulses for 1 rotation. SCALE = 4000 - in Sample configs STEP_SCALE = 4000 - in PNCconf built configs Specifies the number of pulses that corresponds to a move of one machine unit as set in the [TRAJ] section. pos-scale [JOINT_0] ENCODER_SCALE But I could not achieve work in this case and just specify the number in the hal file. scale to -5080, I was I was able to get the hm2_7i95. This is independent of hardware limits. 862168 I will test it Regarding speed: I am limited to 20 meters/minute for my setup because that's the maximum speed of the 1-micron scales, so I set LinuxCNC to 18 meters/minute to have some headroom. I am using 7i92/7i76 and the drives are in step/dir. Please Log in or Create an account to join the conversation. motor-pos-fb" (keep the stepgen's position feedback connected to the PID loop). 075 mm = 16,000 Steps 1 mm = (1*16,000) / 157. New value SCALE = 101. I think home sequence is written in a hurry up time when linuxcnc moved to the joint configuration. The number of teeth missing from the index gap. Normally I would issue an MDI command with a set feed rate, however the two systems do not accelerate at the same rate, even though the acceleration values are set equally (150000/min/sec or 2500mm/s²). General LinuxCNC Questions. I have now been trying to get my numbers right for scale in INI Trying with the help of pncconf but all I get is a rocket launcher ;) I have DM542A drivers LinuxCNC Forum. First time using linear scale feedback and tuning LCNC's PID. When I move them with keyboard jogging they oscillate I am trying to get these servos operating properly. setp encoder. yml FULLSCREEN = Yes, you would have to reduce the step time and step space to reach your requested velocities with the current step-scale. For "spindle velocity" mode it means 10. I have a 5i25 / 7i76 combo but believe I would be short on encoder inputs. g # Get feedback scaling from ini file. STEP_SCALE setp hm2_7i76e. 2048 steps on the encoder. 2", the motor shaft turns 1 rev. 4/Axis" - default image, it is out of scale/proportions. This board produces step pulses of adjustable pulse width to control any stepper driver or servo drive that accepts step and direction signals. In the stepper docs it mentions linuxcnc freezing or locking up if the base thread is set too low which I thought somehow applied to the servo thread in # add scale and lowpass, these will be used in custom_postgui. Yes, but you have the stepgen running in vocity mode, so the PID needs to output a velocity. Configuring LinuxCNC. Choose the step size with all that in mind, then divide the travel per turn of the motor by that step size, and that's the scale value. If your not sure about this setting a value of 20,000 will work with most drives. 3 axis milling machine with 10Nm Steppers (resolution: 1 step =approx. 888888 as the SCALE of the 4th axis Using the config tools just allows you to calculate your scale needed. You can use step and dir interface with closed loop control. 250 paste the above exactly making no changes. 0. Not much, step scale and encoder scale are separate, so you would first make the machine work with steppers only, taking care of step scale, then enter the number of pulses the scale produces for 1mm of travel, or 1 inch. Does maxaccel matter? # Generated by PNCconf at Fri Mar 3 16:12:30 2023 # Using LinuxCNC version: Master (2. The servo is set up to move 1mm for every 1000 pulses (STEP_SCALE = 1000). HAL. The number is set in the INI file. stepgen. (micro steps * motor steps per rev * total gear reduction) / 360 = steps per degree For example i used a 200 step motor with 1000pulses on the driver and a 50:1 harmonic. And, also, the system is likely to move some significant distance after the index before the servo thread can act on the information. SCALE = -8017 This number (-8017) represents the number for steps per machine unit (inches in this case) so you need to calculate the number of steps per machine unit for your mechanics/stepdrive-settings For direct drive step motor systems this would normally be 200*ustep*leadscrew turns-per-inch I have 3 Servo Drives that I want to interface using Step/Dir, glass scales on the axis that I want to interface using TTL signals, one VFD for the spindle that I want to interface using PWM (with PWM -> 0-10V module in between) and an encoder for the spindle. * Step Time - How long the step pulse is on in nano seconds. Then the position loop is closed in Linuxcnc either using the position feedback from your encoder/linear scale or position feedback from the step-counter in the Mesa card. Time to create page: 0. offset 0. Details are in my post referenced For a rotary axis the Scale is in steps/degree. 000 for 1 unit. As far as step time and step space go they also need the ~25% headroom That is, you need to do the timing calculation on the stepgen maxvel number not the machines maxvel number. You need to know your micro stepping, gear ratio if using pulleys and ballscrew pitch. Based on your previous posts you had your scale at 80. So machine unit = one rotation. It is too small. I am using step+- and dir +- and The maximum requested step rate is the product of an axis' MAX_VELOCITY and its INPUT_SCALE. Views: 43. I also reduced the step amounts per revolution from 10000 to 2000, in order to be able to get a bit more velocity and acceleration out of LinuxCNC, I have a belt reduction between the motor and the axis of 2/3. 1111 MIN_LIMIT = -999999. position showing (using Hal Show), and the Linux position matches the external Ditron DRO, so getting the linear scale You can fix or tune the step scale from a working Linuxcnc, it is on the machine menu in "calibration", so you can enter a value, press "test", go to MDI and enter a known value in MM or Inch and measure if it did that exact distance. position-cmd float in (position mode only) Commanded position, in length units (see parameter position-scale). The y axis linear scale works brilliantly, I am Hi, I'm attempting to convert a rather standard milling machine. I can setup on my leadshine driver at 2400 step/rev that will match with the encoder resolution Normally with stepgen you set the motor resolution and microstepping so that calculate the right scale So at this time my driver is set at 400 steps but i can change it by switch on the driver if it could give help The gage wheel encoders for the table are not perfect due to their age and design, but I think they should be accurate enough. 1; 2; 3 6; Replies: 50. gain 0. position => axis. 00 Could it be that something has changed within Linuxcnc its self before it passes the "Sxxxx" value back to the mesa hardware. weird but good working some more on the pid. 01. I have a dual joint axis in which one motor's rotation needs to be in the opposite direction of the other. From what I have understood from another PROGRAM_PREFIX = ~/linuxcnc/nc_files - The default directory for G-code files, named subroutines, and user-defined M-codes. step_type 2 setp hm2_7i76e. sh' and make it executable. Ahh, close enough. That turns out to be roughly 83 in the output scale and that kinda Basically you need to hijack the output of spindle. I had to change my motor steps per revolution to 20 instead of 200 which is obviously wrong. step bit out (step type Thanks for your answer. Can not get step settings that works OK. I just changed the settings to 600 / 2 for the X/Y axis and to 1000 / 2 for the Z axis to give me the same scales as in the settings files people shared in the is thread. scale - Step Mode # Type must be set to velocity # Stepgens must be declared to match the ini declarations # even if not used, hence there is # one for Y even though it does not exist ##### loadrt stepgen step_type=0,0,0,0,0 ctrl_type=p,p,p,p,v addf stepgen. two pulleys 12 tooth to 24 tooth. My calculation Could use some guidance from the community. 44 # gives true at 1000 setp scale. However I corrected it by a factor of 10 and they ran absolutely beautifully. , volts for an amplifier DAC. 009375mm or 4 @ 0. INPUT_SCALE, and MAX_VELOCITY is acceptable, then consider using hardware step generation (such as with the LinuxCNC I'm using a Mesa 7i96, linuxCNC 2. Without scales or with 5u scales I can go up to 35 meters/minute or so before the servo's start running out of revs. 0. You can manually enter the scale in your ini file. The DM542T is set to 25000 step/rev giving 125 microsteps per step. So SCALE 10. If i now go ahead and change a direction parameter on my servo drive to reverse scale - LinuxCNC HAL component that applies a scale and offset to its input. Step time: 5000 Step space: 4000 Dir hold: 4000 Dir setup: 1000 Par port: X step: inverted But when I start Axis and try to draw the "EMC 2. Last Post by Benb 18 Oct 2024 19:17. Configuration Tools. I'm using a Mesa 7i96, linuxCNC 2. Testing this value nearly launched my x of the transom. I am planning to retest this today. 05. , and configuring with pncconf. 000 pulses per 1 motor rotation (in cases of 1:1 ratio 1 Spindle rotation). Hello everybody, I am using linuxcnc since 1 year on my 3axis mill (wabeco F1210 with homemade cnc components) in an open loop configuration with kind of standard setup. If you calculate that you need 2000 step pulses to move 1" (or 1mm) then you can just set everything in Stepconf to 1 (not the veolicites or accel) and set the motor steps per rev to 2000 Hey all, What factors outside of Linuxcnc can cause the axes to move the wrong distance? I say it this way because I just built a new Linuxcnc install with the new 2. (linuxcnc 2. Now linuxcnc in the ini file wants steps per unit so I have entered 20,000 steps per inch both for step scale and encoder scale. Half a turn of the servo moves the table 1mm. Configuration for rotary axis (7i76, stepper+encoder) Configuration for rotary axis (7i76, stepper+encoder) = -66. 8 # If you make changes to this file, they will be # overwritten when you run PNCconf again loadrt [KINS]KINEMATICS loadrt [EMCMOT]EMCMOT servo_period_nsec=[EMCMOT]SERVO_PERIOD num_joints=[KINS]JOINTS loadrt hostmot2 ini file [emc] machine = it42-aike debug = 0 [display] display = axis position_offset = relative position_feedback = actual max_feed_override = 2. I have a really hard time setting the Tried two separate dongles and could never get them working. 9pre. txt test1. If the requested step rate is not attainable, following errors will occur, particularly during fast jogs and G0 moves. I'm trying to understand the following error: hm2/hm2_7i95. Topic started 14 Sep 2011 14:33 by Benb. For stepper systems, this is the number of step pulses issued per # 0-10v scaled upon steps from axis4 and direction of # rotation from Dir signal ##### # Use a scale module for offset and scaling of the stepgen # Offset and scale are determined by first calculating and testing # setp scale. Last edit: 06 Feb 2019 18:32 by Todd Zuercher . The linear scales I have in mind are SINO KA300 with 1µm resolution, If the 5µm resolution works I can use that, but have read somewhere that smaller resolution is better. 000/360 = ~28 steps. 000000 The movements are all correct per the documentation, HOME_SEARCH_VEL speed is used until the switch is hit, then HOME_LATCH_VEL speed is used until the encoder index is hit (yes there are motor encoders, and yes the index pulse is firing) I think I'm confused as I read they use PWM and I need a step/dir which made me think I needed to use stepgen mode 0. I measured the backlash last year and there was none. I'll switch back to mode 2. 0 addf scale. scale [AXIS_0]INPUT_SCALE # connect position feedback from step generators to motion module net Xpos-fb hm2_5i20. 1. microsteps 1/2 =400 steps per revolution reduction 40/1 = 16000 steps per revolution 157. That means the steplen/stepspace would be 2000 ns Rightly or wrongly, I plan to convert my Colchester Bantam to CNC using step/dir servos, ground ballscrews etc. motor-pos-fb # Connect index enables to motion controller, for homing. The final output is a single number in the INI called STEPGEN_SCALE which is the number of step pulses LinuxCNC requires to move the axis by one machine unit. This is an "impedance matching" analysis, similar to how in circuit theory, impedance governs the efficiency of power transfer. For this reason LinuxCNC expects the index to be detected by an encoder counter (typically in the hardware of an interface card, potentially a base-thread software counter if the speed and index pulse size allow). This scaling looks like: The value for scale can be obtained analytically The LinuxCNC Configuration Selector has configs for Sherline already configured. PnCConf Setup issue with the Spindle Start; Prev; 1; 2; Next; End; 1; 2 I have been using Linuxcnc with parallel port stepper drives for many years, and now just out of interest I am trying the esp32 ethernet step generator Hello guys I would like to set my motor steps per revolution here in axis scale calculation to 10,000 but the software limits the value to 1000, is there is a Axis scale calculation - LinuxCNC LinuxCNC Forum The Pico Systems Universal Stepper Controller board controls up to 4 axes using Step & Direction signals. the step scaling is correct in the ini file 1. I am new to LinuxCNC, and I am trying to configure all the electronics step by step. OUTPUT = 0. Impact on the loop may vary between different servo drivers? Serial - Is serial better than step + dir? Proprietary - not interested Driver boards The JMC system allows: analog +/-10V (in speed control and torque control modes Y axes has axis scale 100 steps/mm and Y 2 axes has axis scale 224 steps/mm, how do I set up the stepper configuration for this machine? From the stepconfig wizard I can only set up a 4 axis machine; if I modify the . 3. 9) # If you make changes to this file, they will be # overwritten when you run PNCconf again [EMC] MACHINE = lcnc DEBUG = 0 VERSION = 1. I was able to script nmcli to swap networks via a shell script. 666 steps per degree. But, make the step-scale correct first, as it will affect all PID tuning and speed/accel limits. step_signalname,self. , behind timing belts and a ball screw with some backlash). I have a couple questions about analog vs the step/dir formats. 0 servo-thread # Make sure the machine is set up and working correctly with no feedback to LinuxCNC: 1. 7. 01mm I would need to adjust the scale by 3. After setting setp hm2_7i95. And the fact that 5 millimeters will be passed in one revolution of the motor is the way it should be. 005mm). 096 seconds So my step scale really should be 1200 steps/rev (of pinion) and 40 steps per mm but this doesnt seem to match up. SCALE = -8017 This number (-8017) represents the number for steps per machine unit (inches in this case) so you need to calculate the number of steps per machine unit for your mechanics/stepdrive-settings For direct drive step motor systems this would normally be 200*ustep*leadscrew turns-per-inch Specifically, when writing outputs, the LinuxCNC first converts the desired output in quasi-SI units to raw actuator values, e. 3333 MIN_LIMIT = -999900. 2. step_type 0 this should be step type 1 (velocity mode) 2. Glass scale encoders on all axis (resolution 0. I have set the INPUT_SCALE to -200, as the encoder counts down when the X direction is positive, assuming the scale value can be signed to indicate polarity. 00. Basic Steps to add the components and configure them: [In this example, we will assume that some encoders have already been issued to axes/joints 0, 1, and 2. Manual calc 4000steps 25mmpitch = Scale 160 4000steps 10mm pitch = 400 So now that works. 5 MHz on Mesa Ethernet cards) If I set Linuxcnc step scale at 1/4 for example 12500. Also don't forget to do things like setup the encoder scale and change the PID P term from 1000 to something much lower before you start Linuxcnc as well. ) So for the numbers you gave one revolution of the step motor will give 1/12 of a rev of your rotary, or my steppers are 1. Im running in step/dir from a 7i95 mesa card, with the servo driver set in position mode. in float in scale. The step scale needs to be right to get the correct RPM, but the position is closed-loop to the encoder. 547deg issue - will verify tomorrow) so somehow that step_scale is not used - presumably because the C axis position is from the encoder? Is it unused here? The linear scales I have in mind are SINO KA300 with 1µm resolution, If the 5µm resolution works I can use that, but have read somewhere that smaller resolution is better. 0125mm. unit / external machines step scale = jog-scale, e. 200 and 333. What it comes down to is how many step pulses or encoder counts it takes to travel one of your chosen units of distance. capture-position servo-thread # set the HAL encoder to 60 pulses per revolution. In the process i uninstalled WICD and installed network-manager. Second, do you still have to tune the driver to the motor when you use analog? because I find it hard to tune the motor to the driver, and I have read a few things on here about tuning the analog system in linuxcnc and it seems doable. LinuxCNC is a free, open-source Linux software system that implements computer numerical control capability using general purpose computers to control CNC machines. Micro Steps - is how many steps the drive needs to move First, set the P to 1000 and do not change that for step/dir open loop. step_type 0 setp [HMOT](CARD0). HAL Examples. 01 I am using 7i92/7i76 and the drives are in step/dir. These are the other default values: position-scale 1. 7200 (mm/s) * 44. 0 HOME_OFFSET = The maximum step rate is 1/(steptime+stepspace). StepConf Wizard. I don't know if it is better to calibrate the scale with small distances such as 10mm or with large distances such as 1000mm. Much better. The above mentioned tuning and some testing to make sure the distances traveled are correct. velocity-cmd float in (velocity mode only) Commanded velocity, in length units per second (see parameter position-scale). The SCALE number should be something you derive from the mechanical parts of the machine, not an ad-hoc adjustment. I know nothing about Linux but enjoyed Linuxcnc. I am using nema 24 stepper motors without encoder. Then 1us in not 900ns, it is 1000, but it is wise to set both dir timings to 20000 and both step timings to LinuxCNC is a control method that runs on either an Intel/AMD PC or Raspberry Pi 4, and is paired with either a parallel breakout board (bob) or ethernet connected Mesa 7i76e or 7i96. Many thing's have changed sinds that time. I'm planning on using the MESA 5i25 card and either the 7i76 or 7i77 depending. 0 MAX setp hm2_7i95. Scale is equal to the number of steps need to go 1 machine unit. 5 tpi on the ball screw. I have purchased a mesa 7i84 card to mount behind the panel to save on the amount of wiring that needs to be run. If not, change value, test again. position-scale [JOINT_1]STEP_SCALE setp [HMOT](CARD0). I will take every sensible measure to minimise backlash but plan to integrate linear scales on X and Z, as it would seem rude not to. The scale does seem odd to me, but my understanding was I was looking for number of steps for 1 degree. The following user(s) said Thank You: axk. I have an AC servo as well as a 5um linear glass scale. the FF1 value must be 1 in the ini file 1. My servos are 3000rpm get 500khz step-dir signals and output differential signals from its quadrature incremental rotary encoders (ABZ) 2500ppr (10000 with quadrature) # Generated by PNCconf at Thu Oct 15 21:55:59 2020 # Using LinuxCNC version: 2. missing-teeth s32 in. First, obviously what is better for accuracy, and speed?. txt \#\<scale\>\] 2 . The maximum requested step rate is the product of an axis' MAX_VELOCITY and its INPUT_SCALE. If you calculate that you need 2000 step pulses to move 1" (or 1mm) then you can just set everything in Stepconf to 1 (not the veolicites or accel) and set the motor steps per rev to 2000 I am not sure if this is the right sub-forum or not, but here goes After fiddling with StepConf, I was able to get my (book built) machine to move the The LinuxCNC Configuration Selector has configs for Sherline already configured. lead screw is direct drive, 5mm pitch, but my machine is in inches. I have not done this myself but you have to set up the stepgen in velocity mode and use a pid to close the position loop. 8deg (200 per rev). 050 usec, the maximum steprate would be about 99 KHz but the requested stepgen velocity of 50 mm/sec at 2000 steps per mm needs a 100KHz step rate. 4) Joy joy joy what should I set the scale to for a 16 micro steps drive and 1. Topic started 09 Oct 2024 22:49, by iforce2d. 0 units. It is only 75mm long, and should be 188-something mm. scale)) Thanks guys. scale - [SPINDLE_0]ENCODER_SCALE with a minus but that alone does not change the direction of m3/m4. Step mode gives a step far to large at the higher settings 60% and 100%. The second part is to let LinuxCNC know when the spindle is at speed so motion can begin. Now in a terminal cd into the directory and paste: bash Scale_cutall_combined. Step 2 would be to copy my 'Scale_cutall_combined. But with HAL you can turn the impulse function into a step function, and then the peculiar LinuxCNC logic works at reasonable speeds. two pulleys 10 tooth to I also commented dirsetup, dirhold and stepspace and I get different errors from linuxcnc and the driver. I am using step+- and dir +- and Can LinuxCNC use the current setup run in step-dir mode with the teco drive closing the loop to the servo AND take into account data from a linear scale for absolute positioning? Depending on the scale resolution, you might be able to do it with a single layer of PID. 075 mm 1 mm = 101,862168 Steps / mm Then this is the new calculation. 0 # these are in nanoseconds DIRSETUP = 10000 DIRHOLD = 10000 STEPLEN = 5000 STEPSPACE = 5000 STEP_SCALE = 111. 03. 8° Getriebe: 40 zu 1 (Eingangsumdrehungen 40, Ausgangsumdrehungen 1) Do you take the existing SCALE value and divide it by the actual movement and then multiply that value. 0:stepgen. 1 [DISPLAY] DISPLAY = gmoccapy EMBED_TAB_NAME = Center_panel EMBED_TAB_LOCATION = ntb_preview # Généré par PNCconf le Sun Apr 18 11:08:51 2021 # Using LinuxCNC version: 2. With software step generation, the maximum step rate is one step per two BASE_PERIODs for step-and-direction output. So SCALE became 10. Full analog - dual loop into linuxcnc (servo rotary encoder and axis linear encoder) Step + dir - common interface. scale needs to be set to say how close the two numbers must be before turning on the output The Mesa card converts the velocity commands to the position step pulses that the servo drive is reading. maxvel is too big for current step timings & position-scale, Clipping to Max possible. control-type 1 setp LinuxCNC can control up to 8 spindles. The scale can’t be connected directly to the drive. ) LinuxCNC will sign-extend and overflow the 24-bit count to a floating-point value of practically unlimited range in a floating "long The step space and step time values were already 5000. Generated by PNCconf at Sat Oct 3 17:03:13 2020 # Using LinuxCNC version: UNAVAILABLE # If you make changes to this file, they will be # overwritten when you run PNCconf again [EMC] MACHINE = Skyfire DEBUG = 0 VERSION = 1. Laser power scaling based on speed and direction. 333333r. 238 OUTPUT_MIN_LIMIT = -466. my stepper drivers are set, i think, to 1/8 microstepping (Leadshine In the step calculator I set the following values: Checked Pulley Teeth: 25, 25 Microset Multiplication Factor: 125 Motor steps per revolution: 200 This gives a motor step per With software step generation, the maximum step rate is one step per two BASE_PERIODs for step-and-direction output. N (requires a floating-point thread) PINS scale. 8 deg stepper on half stepping in the driver with a 1. I blame lockdown. So, to be clear, what I basically do is double the amount of microsteps, right? That seems to work, although now I need to scale down the amount of microsteps on the drivers to get the speed I want, because LinuxCNC is complaining that the maximum velocity is too big for the step timing. In general there is no advantage to going beyond say 1/32 microstepping (6400 steps per turn on a 200 step motor) scale − LinuxCNC HAL component that applies a scale and offset to its input. 1000 / 200 = 5 Micro Steps (5 * 200 * 50 ) / 360 = 138. STEP_SCALE = 800 # Output Scale in RPS: 466. Last Post 09 Oct 2024 23:25 Configuring LinuxCNC. Scale in StepConf, not in Axis Step time: 5000 Step space: 4000 Dir hold: 4000 Dir setup: 1000 Par port: X step: inverted But when I start Axis and try to draw the "EMC 2. sh test. I thought it should stop doing that once inside the deadband, but it just kept on although not very often, one microstep every 5-20 seconds or so. update-counters base-thread addf encoder. 20% difference on driver displayed rpm conpared to linuxcnc. out = Enables output steps - when false, no steps are generated. 66677 = 28000RPM OUTPUT_SCALE = 595. About the home sequence : The machine can not be moved when a mill is drowned into a workpiece accidently, even after you restart Linuxcnc, homing looks impossible with mill drowned into workpiece. scale cont Mode Jog. Any help is to increase the maximum possible step rate. I am measuring with a tape measure. With a steptime and stepspace of 5. hal loadrt scale count=1 loadrt lowpass count=1 # add the encoder to HAL and attach it to threads. 8 degres per step so basically 3200 micro steps per revolution ? Last edit: 07 May 2016 14:10 by gaeldk. Yes i agree, the problem is i dont really have a way to find that out myself i believe. If I am right then 1 step = 0. For stepper systems, this is the number of step pulses issued per machine unit. For example, if position-scale is 500, then 1000 counts of the encoder will be reported as a position of 2. hal and . I was suspicious but when I put an digital angle finder on the chuck and test it I get the correct amount of rotation. Is one more preferable than the other in terms of performance? Are there any examples using LinuxCNC with both encoder/scale inputs. INPUT_SCALE, and MAX_VELOCITY is acceptable, then consider using hardware step generation (such as with the LinuxCNC-supported In my case it is 1. AXIS reports velocity of 6000 that seems a bit slow, how do I get higher speeds? Configuring LinuxCNC. setp hm2_5i20. 667 OUTPUT_MAX_LIMIT = 466. 4. 7778 seems correct to me. Those scales will work, but check when you order, they seem to be available in different output options. Computer Laptop Pentium4, 2. 0 MAX_LIMIT = Exactly what is worse with the tune when you have the linear scales feedback connected? Start by testing the servo's movements with the linear scale and the normal Mesa open loop stepper configuration, except connect the The drivers support both position (step/dir) and analog (velocity/torque). The motor encoders do have more effective resolution, but that doesn't directly translate to positioning due to where they are located in the mechanical system (i. PCW, Where do I find the position scale? Is this the same as step scale in the ini? I know, it was just that the motor never stopped reposition. I vefified the signals A/B in the oscilloscope and they look good but it seem that they are not going at the correct rate. LinuxCNC with EtherCAT¶. capture-position servo-thread addf stepgen. 0 MIN_LIMIT = -0. For a linear joint one machine unit will be equal to the setting of LINEAR_UNITS. speed-out to your device that receives the rpm. From what I have understood from another post here, the way to give the feedback to the pid is hi, I try to config my a axis, but i dont know how do scale it in velocity mode need help for this motor ac 3ph inverter pin1=enable pin2=frequency I want to drive servos (step+dir mode or analog velocity mode) from linuxcnc with outer closed loop. In the step calculator I set the following values: Checked Pulley Teeth: 25, 25 Microset Multiplication Factor: 125 Motor steps per revolution: 200 This gives a motor step per unit of 25000. I am using a 7I76e (final config includes 7I89 & 7I88) and have 3 axis working nicely with linear scales providing positional feedback and stepper control (only configured y axis linear scale in attached HAL/ini). when I jog . in 0 setp scale. txt' file to that directory and rename it to 'Scale_cutall_combined. g. You can either copy and paste the output to a text editor (it's shift-ctrl-c in the terminal for copy) or send it direct to a file with [HMOT](CARD0). So I assume a stepper motor with 200 steps/360° with 8x microstepping that would be 1600 steps/360° with ratio 4:1 that would be 6400 steps/360° so your scale = 17. Could you toggle between the two or use both at the setup cia402. I assume this part is correct. loadrt encoder num_chan=1 addf encoder. This is what I have. 83 by just testing via rpm difference at 100 rpm 500 and 1000. See, for example, the sim config sim->axis->vismach->vmc-toolchange Generated by PNCconf at Sat Oct 3 17:03:13 2020 # Using LinuxCNC version: UNAVAILABLE # If you make changes to this file, they will be # overwritten when you run PNCconf again [EMC] MACHINE = Skyfire DEBUG = 0 VERSION = 1. First Post. I did a test cut of the LinuxCNC logo, and it all gust fine, but it is still 15% to 20% too small. Some how I doubt you will ever need to go that fast (or that the motors could). STEP_SCALE = 800.