Linuxcnc step scale. I have an AC servo as well as a 5um linear glass scale.

Linuxcnc step scale Hello everybody, I am using linuxcnc since 1 year on my 3axis mill (wabeco F1210 with homemade cnc components) STEP_SCALE setp hm2_5i25. Toggle Navigation Remember Me Hello, please tell me what resolution have your linear scale 5um or 1um, (for a pure step/dir system, P should be 1000 and FF1 should be 1. maxvel is too big for current step timings & I have been trying to figure out the input scale. Half a turn of the servo moves the table 1mm. 00maxvel is too big for current step timings & position-scale, clipping to max possible " message means is that your current steplength and stepspace settings will not let you reach the maximum velocity in your INI file at your current steps/turn settings The LinuxCNC Configuration Selector has configs for Sherline already configured. The next thing I need to do is learn about the kinematics to offset the top of the platter (C-Axis) with the hinge point of the cradle (A-Axis) which is about X0, Y0, Z~15mm or so. Toggle Navigation Remember Me General LinuxCNC Questions. LinuxCNC requires the home sensor to provide a step function of the home position, not an impulse. This allowed me to limit the maximum corrrection from the scale to +/- 0,30mm. 0 MAX_LIMIT = 999999. (With things like steppers - the feedback is hooked up internally) There are a couple of reasons why there could be FE with steppers -Step gen doesn't have 20+% acceleration headroom. If you have a step scale of 8000 and a maxvel of 80 then that is a step rate of 640 kHz. The reason for the unreasonably slow crawl working is that LinuxCNC is peculiar, not recognizing anything but a step function switch, not an impulse function with a falling edge like a scale index. Simple STEP_SCALE = 1000 This gave me a max velocity of 60mm/sec (3600mm/min) on a 5mm ball screw on my plasma Z axis the step outputs (LinuxCNC default is active high) The following user(s) said Thank You: visharc. You likely don't need any hardware as the others are suggesting, just HAL magic. it it very similar # Generated by PNCconf at Thu Sep 3 17:54:38 2020 # Using LinuxCNC version: UNAVAILABLE # If you make changes = 2000. Cant get step/dir drives to move 7i92-7i76. The rate is changed by the LinuxCNC serv-thread once every millisecond or so. Hey guys, I´m back with just another problem I can´t seem to figure out. HAL and INI file may attach See the video The signal flow is scale -> PID -> step gen ~> DYN2. Closed loop with steppers. As they are both set to 1000ns there simply isn't time to pulse that fast. Runs under Linux (optionally with realtime extensions). My Z-axis is driven by a stepper, so I need only 7 encoders (Z only needs 1 encoder-input for the scale). Hello, Our hardware configuration is: - one drive controled by step/dir - one encoder returning the real position (exact position verified) In the HAL we use: With software step generation, the maximum step rate is one step per two BASE_PERIODs for step-and-direction output. First, obviously what is better for accuracy, and speed?. 5 mm/second by the step timing. 0 MAX_LIMIT = 300. Configuration Tools. N. So SCALE became 10. 001000 They were both generated by PNCconf but the documentation seems to suggest they both address the same factor ie how many steps per machine unit. So when is the machine switched to C Axis after 5 minutes of turning at full speed, it goes 5 minutes reverse at full speed to reach the last position Step scale should be the actual step scale, meaning the the steps per revolution multiplied by the microstepping and divided by the actual axis movement per revolution of the motor. I have a really hard time setting the 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 When I try to use a pencil to try to draw LinuxCNC - default text, it is much smaller than it should be. 0. 050000 HOME_LATCH_VEL = -0. g. 8Ghz, 1GB Ram, General LinuxCNC Questions. The spindle analogue output (0-10V) works with Sxxx M3 command but not with a M4, CCW. 10mm = 12800 Schritte (oben berechnet) 1mm = StepScale The maximum step rate is not related to latency (and about 12. -This howto will detail tuning the PID for a stepper system with normal steppers and stepper drives, and added encoders or glass scales that feed back to LinuxCNC, be it through parallel port or Mesa hardware. maxvel is too big for current step timings & position-scale, clipping to max possible. It samples the response function with a slow-velocity move to find the inverse, that is, the motor position that happens to close the switch. 0 HOME_OFFSET = 0. Yes, you would have to reduce the step time and step space to reach your requested velocities with the current step-scale. The servo is commanded by a dir/pulse position output. position I'm using a Mesa 7i96, linuxCNC 2. 03. If you I am using 7i92/7i76 and the drives are in step/dir. I am using step+- and dir +- and tried 0,1,2 step type to no avail. That means that STEP_LENGTH + STEP_SPACE must be less than 1500ns. The timing info is correct AFAIK. in 0 setp scale. position-cmd float in (position mode only) Commanded position, in length units (see parameter position-scale). (step = microstep). Hi! I finished one of lathe, the servo 6Nm, spindle 10KWt, precession near 20mk. It can also generate full-step drive waveforms 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. 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 I hooked everything up, flashed the 5i25 with the 5i25_prob_rfx2 firmware, and used PNCConf wizard to create a basic LinuxCNC configuration. 8 deg stepper on half stepping in the driver with a 1. lead screw is direct drive, 5mm pitch, but my machine is in inches. Since you also have linear scales (i hope i am on the right topic), having two loops should be much better, so use motor encoder to close velocity loop in LinuxCNC with the first PID, and use the scales to close the position loop in LinuxCNC with the second PID. I got my Step_Scale calculated with the tool in the StepConf Wizard. For a rotary axis the Scale is in steps/degree. When I Test LinuxCNC Forum. 44 # gives true at 1000 setp scale. Is one more preferable than the other in terms of performance? Are there any examples using LinuxCNC with both encoder/scale inputs. 66677 = 28000RPM OUTPUT_SCALE = 595. It's an misfeature that LinuxCNC requires a homing switch to be a step function instead of an index pulse, but that can be worked around as I've The TTL signal of the scale is connected to the first encoder input of the 7i95. 00. 0 MAX_LIMIT = 1200. (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. 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. 0 HOME_OFFSET The units on the scale value are in true volts per DAC output volts. update-counters base-thread addf encoder. STEP_SCALE = 800. I have an AC servo as well as a 5um linear glass scale. I have got it into my head that the scale is based on one step of a This page is for step and direction timing of stepper drives. I loaded the 7i77+7i76 firmware on the 6i25 and used a small breadboard with 3x SN75176 and some extra electronics on it for the stepper channels and extra RS422-capable encoder channels. 888888 steps per degree So i would enter 138. Im running in step/dir from a 7i95 mesa card, with the servo driver set in position mode. If the requested step rate is not attainable, following errors will occur, particularly during fast jogs and G0 moves. 000000 # Generated by PNCconf at Thu Oct 15 21:55:59 2020 # Using LinuxCNC version: 2. Now that I know the linear scales are So my step scale really should be 1200 steps/rev (of pinion) and 40 steps per mm but this doesnt seem to match up. Any type of tuning I'm attempting with the scale seems to make things much worst than without the scale feedback at all. 01. Step 1 is to display in Axis (and calibrate as required) the linear scale information being fed to the encoder 0 input on the 7i95t. I blame lockdown. So SCALE 10. 0001in granularity, and if the motor turns translate into 0. 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. I have a C6 spindle control board that should output a 0-10v signal If the full scale RPM is 3490 RPM, the step scale would be set to 25000/3490 = ~7. At a step scale of 1600 steps/mm the maximum velocity is bounded to 62. 0 servo-thread # Using the config tools just allows you to calculate your scale needed. My initial thought was to use the step pulse from WinCNC (this has the slower acceleration rate) as an encoder input to "jog" the x axis of LinuxCNC, this however requires two signals (ENCA+ & ENCB+) So basically I want to know if there is a way to "step/jog" an axis from an external step pulse. -Too many realtime errors that causes the system to miss realtime targets. in float in scale. step_type 0 # Standard Step Signal setp hm2_5i25. STEP_SCALE = when I switch from spindle to C Axis, spindle returns to the last position of the C Axis. 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. From what I gathered on information thus far if you plan on going full closed loop to LinuxCNC it's better to use analog control versus step/direction. My dilemma is THIS: shell I use step control or speed control? 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. 0025mm). 2nd you need to confirm your axis calibration so your movement distances are correct. velocity-cmd float in (velocity mode only) Commanded velocity, in length units per second (see parameter position-scale). If you I'm calculating the step scale to be at ~1700 with 1 and 2 inch per second automated jog movements. 6666 # these are in nanoseconds DIRSETUP = 2500 DIRHOLD = 2500 STEPLEN = 5000 STEPSPACE = 5000 STEP_SCALE = 33. I have a 5i25 / 7i76 combo but believe I would be short on encoder inputs. offset 0. capture-position servo-thread # set the HAL encoder to 60 pulses per revolution. # Generated by PNCconf at Tue Jan 18 09:12:59 2022 # Using LinuxCNC version: 2. andypugh; Offline; Moderator OUTPUT_SCALE = 125 OUTPUT_SCALE_NEG = -125 MAX_OUTPUT = 125 Step or velocity control for servo gantry. 125mm with speed X (how fast we need to be at 2. 163 Please Log in or Create an account to join the conversation. two pulleys 12 tooth to 24 tooth. The second part is to let LinuxCNC know when the spindle is at speed so motion can begin. 009375mm or 4 @ 0. The stepmotor driver is L297-L298. (LinuxCNC) loop. Configuration for rotary axis (7i76, stepper+encoder) Configuration for rotary axis (7i76 = -66. 7778 seems correct to me. now on linuxcnc its more sensitive to the rotation of the wheel and if i dont turn it at a constant speed, it makes a stuttering motion. 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 scale - LinuxCNC HAL component that applies a scale and offset to its input. speed-out to your device that receives the rpm. 26667 and now the spindle turns correct. 01mm I would need to adjust the scale by 3. Thus: scale PID had position as input, position as output. 3333 MIN_LIMIT = -999900. Went with these drives specifically because you can also connect your linear scale directly to the drive to close the loop. 7 pre version with improved TP of LinuxCNC please? Please Log in or Create an account to join the conversation. The Problem with the difference between spindle-fb-rps and spindle-speed-rps still persists tho. If the requested step rate is not attainable, INPUT_SCALE, and MAX_VELOCITY is acceptable, then consider using hardware step generation (such as with the LinuxCNC-supported Universal Stepper Controller, Mesa cards, and others). 000000 on step mode it stepped with every pulse but i was not able to make consequtive steps as i do in linuxcnc. I'm planning on using the MESA 5i25 card and either the 7i76 or 7i77 depending. Computer Laptop Pentium4, 2. 0001in. Please add to this list using the stepconf wizard format and in nanoseconds so it will be uniform. 01 MAX_LIMIT = 200. 6666) as the ini file comment suggests. -This howto implies creating a config using the PncConf wizard. LinuxCNC's HOME_* configuration variables are both overloaded and incomplete. This is how many steps per user unit. Just do not forget to click on "save to file" when you're done tuning. In my testing (with 5u scale, BTW) I had the scale PID act on position. so getting the linear scale values as seen by LinuxCNC was as simple as that. Time to create page: I'm using a Mesa 7i96, linuxCNC 2. A great deal of jitter in the millisecond timing can be tolerated as the actual position and step rate runs closed-loop inside LinuxCNC using a PID. 7. 0 MAX_LIMIT = 999900. N (requires a floating-point thread) PINS scale. The DM542T is set to 25000 step/rev giving 125 microsteps per step. provide us with more info, it is very hard to help with very limited Hi, I've been stuck on this for a wile and cannot get the lathe spindle and encoder working correctly. two pulleys 10 tooth to edit: I'm not clear on the difference between SCALE and STEP_SCALE but reading this: 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. Please Log 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 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 know nothing about Linux but enjoyed Linuxcnc. 0000) Last edit: 30 Nov 2021 00:12 by PCW. 0 # these are in nanoseconds DIRSETUP = 1000 DIRHOLD = 1000 STEPLEN = 1000 STEPSPACE = 1000 STEP_SCALE = -1000. At the Moment the motor is rotating very slowly and I'm having trouble configuring both my Driver and Linuxcnc to match the "real" speed of the axis and the displayed speed in Linuxcnc. Based on your previous posts you had your scale at 80. 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 (linuxcnc 2. LinuxCNC is a free, open-source Linux software system that implements computer numerical control capability using general purpose computers to control CNC machines. For stepper systems, this is the number of step pulses issued per machine unit. What it comes down to is how many step pulses or encoder counts it takes to travel one of your chosen units of distance. loadrt encoder num_chan=1 addf encoder. step bit out (step type # Generated by PNCconf at Sun Jan 6 10:34:22 2002 # If you make changes to this file, they will be # overwritten when you run PNCconf again loadrt timedelay count=1 loadrt abs count=1 loadrt trivkins loadrt [EMCMOT]EMCMOT servo_period_nsec=[EMCMOT]SERVO_PERIOD num_joints=[TRAJ]AXES loadrt I know PathPilot will need several changes but I couldn't get it to work with LinuxCNC using Pncconf either. 0: stepgen. Generated by PNCconf at Sat Oct 3 17:03:13 2020 # Using LinuxCNC version: UNAVAILABLE # If you SCALE = 2000. Now that I know the linear scales are In my case it is 1. 1in/0. 8 degres per step so basically 3200 micro steps per revolution ? Last edit: 07 May 2016 14:10 by gaeldk. LinuxCNC's model of homing logic is faulty, and it only works for certain special cases of hardware. The drivers support both position (step/dir) and analog (velocity/torque). Any type of tuning I'm attempting with the scale seems to make things much worst than 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. there was some kind of delay. offset float in scale. 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. stepgen. It can drive milling machines, lathes, 3D printers, laser cutters, plasma cutters, robot arms, hexapods, and more. I measured the backlash last year and there was none. If I am right then 1 step = 0. 125mm) So machine unit = one rotation. 0 # these are in nanoseconds DIRSETUP = 10000 DIRHOLD = 10000 STEPLEN = 5000 STEPSPACE = 5000 STEP_SCALE = -1000. 4) Joy joy joy what should I set the scale to for a 16 micro steps drive and 1. Hello, Our hardware configuration is: - one drive controled by step/dir - one encoder returning the real position (exact position verified) In the HAL we use:. For stepper systems, this is the number of step pulses issued per machine FF1 - Steps/inch is 50810, and INPUT_SCALE = 25398, so I'm guessing I need to drop it from 1. I managed to build a configuration controlling the motors. 25mm thread pitch, scale comes out of wizard as 320. 000000 HOME_SEARCH_VEL = 20. You can manually enter the scale in your ini file. ) 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. The second part is to let LinuxCNC # add scale and lowpass, these will be used in custom_postgui. spindle via step/dir servo and Mesa card was created by robertspark I've got / had my lathe spindle set up via a asda2 servo drive, with a 2:1 reduction drive. , and configuring with pncconf. The drives are LinuxCNC Forum. 0 MIN_LIMIT = -200. 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. Try it, and do whatever tuning is necessary to the drive Hi! I finished one of lathe, the servo 6Nm, spindle 10KWt, precession near 20mk. 02 scale is taken from [SPINDLE_0]STEP_SCALE which is 8000. The TTL signal of the scale is connected to the first encoder input of the 7i95. 0 MIN_LIMIT = -0. 0 HOME = 0 HOME_OFFSET = 0. control-type 1 setp hm2_7i76e. 1. control-type 1 # position control mode (0) (Stepper Openloop 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 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. i did invert it to: OUTPUT_SCALE = -68. Does something simple like the LinuxCNC text work? Step timings are probably not significant here (you are a long _OUTPUT = 0. The servo is set up to move 1mm for every 1000 pulses (STEP_SCALE = 1000). 'servo' PID had position as input, velocity as output. Now I added linear scales on each axis and want to use them in a closed loop. This is completely unrelated to the encoder scale (which seems to have been factored in) (at least assuming 10000 steps per turn) Configuring LinuxCNC. 000000 HOME_SEARCH_VEL = -0. And the fact that 5 millimeters will be passed in one revolution of the motor is the way it should be. on cont. I initially tried position control and used the Y servos as master-slave(got the step signal from Y1 output and feed it to Y2; used the 5i25 and 7i76). Step pulse is 5v (can be scaled with op-amp) Hi, Im new to emc, im trying to convert from mach 3, i have a machine under mach control with a step / dir spindle, well actually its just a 1kw ac servo and i need to control it, i googled the subject and found some stuff about re connecting a stepgen in hal, i have a broad understanding of what that means, i configure my spindle as the a axis and then reconnect the Hi everyone, I'm pretty new to linuxcnc and i'm working on a BF-16 retrofit with a Mesa 7i95 board and encoders on the X and Y axis. 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 decks). So LinuxCNC calculates how many pulses/steps we need to move in one direction to 2. hal loadrt scale count=1 loadrt lowpass count=1 # add the encoder to HAL and attach it to threads. I never tested because I got so annoyed of the step-sound, but I guess the table will move after some tension has been built up by the motor (stick-slip). 3. 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. 0 LinuxCNC Forum. Or, The maximum step rate is not related to latency (and about 12. 2 but if it only works on whole steps then it will be 3 @ 0. 000 for 1 unit. Now you have the scale loop in place, but it is disabled. You can do that from within AXIS, Ja mein Motor macht 1. gif INTRO_TIME = 5 PROGRAM_PREFIX = /home i did invert it to: OUTPUT_SCALE = -68. Should be doable, but i have yet to try as i have no linear scales on anything. This means that the actual maximum joint velocity should be about 50 mm/s (leaving the stepgen about 25% headroom) 3 axis milling machine with 10Nm Steppers (resolution: 1 step =approx. I'm up and running, but I'd just like to know if there is a way to accomplish this in pncconf without hand editing? When I try to use a pencil to try to draw LinuxCNC - default text, it is much smaller than it should be. Finally I had to manually edit the ini file and make the step scale negative on that joint to get inverted rotation. The position command enters the PID, gets copied to the output, and is fed to the stepgen position-cmd. SYNOPSIS loadrt scale [count=N|names=name1[,name2]] FUNCTIONS scale. Not sure if I'm doing it right but so far it seems to behave correctly. gif INTRO_TIME = 5 PROGRAM_PREFIX = /home 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. X and Y 2000 steps on the encoder. I also add a capture of the driver scopes. The SCALE number should be something you derive from the mechanical parts of the machine, not an ad-hoc adjustment. That is, with 5000 ns step time and 5000 ns step space you are limited to a 100 KHz step rate. This board produces step pulses of adjustable pulse width to control any stepper driver or servo drive that accepts step and direction signals. weird but good working some more on the pid. PnCConf Wizard. To continue the example, if you are a pessimist and choose 0. Toggle Navigation Remember Me Log in INTRO_GRAPHIC = linuxcnc. so far with some P I get it to land on the right spot, but it does it extremely slow so far I have attached a pdf of the page in the manual of this drive that talks about step and direction. 005mm). 0125mm. Any help is very much appreciated EDIT: (01/02/2020) The questions above were solved thanks to amazing support. Please Log in or Create an account to join the conversation. 238 OUTPUT_MIN_LIMIT = -466. position-scale [JOINT_3]STEP_SCALE setp hm2_7i96. 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). I've got the drive wired up in step/dir mode as I don't have any +/-10V output options on my bench test breadboard at the moment. With a steptime and stepspace of 5. setp encoder. 8 # If you make changes to this file, they will be # overwritten when you run STEP_SCALE setp hm2_7i76e. What the:" hm2/hm2_7i76e. Yes, but you have the stepgen running in vocity mode, so the PID needs to output a velocity. HAL and INI file may attach See the video If you need to ramp your spindle speed command and your control does not have that feature it can be done in HAL. 9pre. [SCALE] setting. control -type 1 setp I think the output scale should be 166. The units on the offset value are in volts. 0. 0 addf scale. The scale should be 130048 steps per inch (this will be called STEP_SCALE in the . pos-scale [JOINT_0] ENCODER_SCALE But I could not achieve work in this case and just specify the number in the hal file. The servos have their own closed loop. This is what I have. speed-out and run it through a limit2 component with the scale set so it will ramp the rpm from spindle. 0 # these are in nanoseconds DIRSETUP = 10000 DIRHOLD = 1500 STEPLEN = 7000 STEPSPACE = 500 STEP_SCALE = 200. For a linear joint one machine unit will be equal to the setting of LINEAR_UNITS. Am totally blown away by LinuxCNC and the people who make it what it is - so thanks in advance. Could someone guide me to the git link for the 2. This scaling looks like: This results in a step taken every second without effect. Step/U = 200 Step/U * 64 Step/U = 12800 Schritte Steigung: Schritte pro mm Jetzt muss man wissen, was bei einer Umdrehung zurückgelegt wird, bei mir ist das ein Spindel mit 10mm/U. Specifically, when writing outputs, the LinuxCNC first converts the desired output in quasi-SI units to raw actuator values, e. spindle-fb-rps is negative and spindle-speed-rps is positive (in case of m3). You need to know your micro stepping, gear ratio if using pulleys and ballscrew pitch. You might need to tune but I think that in most cases a p-gain of 1000 is right for such a system. If not, change value, test again. 1000 / 200 = 5 Micro Steps (5 * 200 * 50 ) / 360 = 138. Option 2: Step and Direction - Tested and Works, accurate, however when the spindle is in that mode it really tries to act like a Servo, so a square form stop (IE the steps pulses just stop) shakes the heck out of things as it tries to stop instantly, and that can't be good for the ATC spindle, the Belt drive, or well the machine. maxaccel [JOINT I have a couple questions about analog vs the step/dir formats. I assume that LinuxCNC with the current GUI displaying the camera as is would net a higher jitter based on the latency of the image displayed and may be the cause of the crashes but I have not tested latency with the GUI running as is. CAUTION: Encoder scale and step scale in hal are not the same thing!!! # Generated by PNCconf at Tue Jan 18 09:12:59 2022 # Using LinuxCNC version: 2. 667 OUTPUT_MAX_LIMIT = 466. Scale is equal to the number of steps need to go 1 machine unit. 2048 steps on the encoder. First Post. The maximum requested step rate is the product of an axis' MAX_VELOCITY and its INPUT_SCALE. No smoke and everything looked ok until I tried to move an axis. Testing this value nearly launched my x of the transom. step_type 0 setp hm2_7i76e. There is an FPGA on the 5i25 that makes steps at very regular rate up to 10Mhz. LinuxCNC controls CNC machines. 000/360 = ~28 steps. The following user(s) said Thank You: paulsao Please Log in or Create an account to join the conversation. stepgen. of the current step timing. setup cia402. 8grad, somit 200 Step/U Meine Endstufe steht auf 1/64 demnach muss ich doch rechnen. 016667 so I think there is a delay or a mismatch between linuxcnc speed en servo speed. I had to change my motor steps per revolution to 20 instead of 200 which is obviously wrong. 1in of motion, then the scale value is 1000 = 0. Last edit: 06 Feb 2019 18:32 by Todd Zuercher . my stepper drivers are set, i think, to 1/8 microstepping (Leadshine Replied by tommylight on topic step_scale, max_vel and step/dir timings First, set the P to 1000 and do not change that for step/dir open loop. 5 to start? FF2 and FF3 both seem to help with the initial spikes, but I'll work on the above first. position-scale [JOINT_2]STEP_SCALE setp hm2_7i96. - nerdegutta 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. When I This results in a step taken every second without effect. 000000 Enables output steps - when false, no steps are generated. 0 to 0. The stepgen docs say position-scale is "steps per length unit". The first step is to rule out that you don't have any lost motion issues do to backlash or missing steps. The machine has less than LinuxCNC with EtherCAT¶. mode motion was more smooth on mach3 as if it was averaging the values. 8 image, clean configuration using pncconf, on a totally Yes, that's correct. I'm trying to understand the following error: hm2/hm2_7i95. out = # 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. The maximum requested step rate is the Gather information on steps and gearing. step_type 0 setp hm2_7i96. 0 HOME_OFFSET = 396. Or calculate the motor steps per turn, reduction, and the distance traveled for the pinion or belt pulley. Time to create page: Hi! I finished one of lathe, the servo 6Nm, spindle 10KWt, precession near 20mk. gain float in scale. My calculation Step 1 is to display in Axis (and calibrate as required) the linear scale information being fed to the encoder 0 input on the 7i95t. 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. However, the tuning "software" is no more than a means of downloading and uploading the table of parameters from a PC to the drives and I don't seem to be alone in being unable to even load the "software" on a W10 machine. 8 # If you make changes to this file, they will be # overwritten when STEPSPACE setp hm2_7i96. Using the DMM tuning software, I was able to put a quick auto-tune on it, and I've got it moving around under LinuxCNC control using position control from a stepgen in the Mesa. 000000 HOME_SEARCH_VEL = 0. So here we have different settings for the same Rightly or wrongly, I plan to convert my Colchester Bantam to CNC using step/dir servos, ground ballscrews etc. 04. I have been away from cnc for about OUTPUT = 0. I am planning to retest this today. The y axis linear scale works brilliantly, I am Connecting a glass linear scale to linuxcnc was created by jools Hi All I want to make a compensation file as my ball screws have minor errors in them along their length so have some questions about which to buy, how to connect them and how to connect them to the Halscope to log values. HAL and INI file may attach See the video 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. Then 1us in not 900ns, it is 1000, With software step generation, the maximum step rate is one step per two BASE_PERIODs for step-and-direction output. 02. 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. STEP_SCALE = 800 # Output Scale in RPS: 466. In case of rotation, machine unit = 1 degree. 0 # these are in nanoseconds DIRSETUP = 10000 DIRHOLD = 10000 STEPLEN = 5000 STEPSPACE = 5000 STEP_SCALE = 111. . 8deg (200 per rev). 888888 as the SCALE of the 4th axis The scaling is different for quadrature, you need to divide your STEP_SCALE settings by 4 in addition you should set the steplength, stepspace, dirsetup, dirhold to a small number (say 100 ns) so they have no affect on the quadrature timing Please see my post Precision automatic homing using an independent DRO scale index. Glass scale encoders on all axis (resolution 0. 6666 (or -166. The scale can’t be connected directly to the drive. 1111 MIN_LIMIT = -999999. Same for the encoder scale, it should be PP divided by the movement of the axis per revolution. These can be used to linearize a DAC. out float out. Test this axis - This 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 Hi, I'm attempting to convert a rather standard milling machine. When I move them with keyboard jogging they oscillate I know it seems like they need tuning but I think it may be linuxcnc and how it is setup. After checking things over, I fired the mill up. e 320 400 etc or will it work with a decimal place. 0:stepgen. 0 MIN_LIMIT = 0 MAX_LIMIT = 420. Hello, Our hardware configuration is: - one drive controled by step/dir - one encoder returning the real position (exact position verified) In the HAL we use: I initially tried position control and used the Y servos as master-slave(got the step signal from Y1 output and feed it to Y2; used the 5i25 and 7i76). * Step Time - How long the step pulse is on in nano seconds. The result of this is steps per user unit which is used for SCALE in the INI file. Do you take the existing SCALE value and divide it by the actual movement and then multiply that value. Because LinuxCNC's logic about homing is not properly designed. I'm using the Mesa 7I96 board and a ball screw axis with a threat pitch of 5mm per rotation . HAL and INI file may attach See the video Internally linuxcnc see's everything as closed loop. 5 MHz on Mesa Ethernet cards) If I set Linuxcnc step scale at 1/4 for example 12500. Hallo zusammen, ich verstehe die Meldung nicht ganz, welche Werte sind im Verhältnis zueinander nicht OK und in welchem Verhältnis muss was zueinander stehen, damit es passt? stepgen. Time to create page: 0. Does the scale function only work on whole numbers, i. gain 0. My dilemma is THIS: shell I use step control or speed control? The stepgen. 667 The maximum requested step rate is the product of an axis' MAX_VELOCITY and its INPUT_SCALE. control -type 1 setp Typically with a setup like yours (step-dir and scales) you would set the LinuxCNC stepgen to velocity mode, send velocity commands from the pid to the stepgen and use the scale as position feedback to the pid. 5 tpi on the ball screw. I'm up and running, but I'd just like to know if there is a way to accomplish this in pncconf without hand editing? I am using 7i92/7i76 and the drives are in step/dir. I think you should do some tuning effort. Basically you need to hijack the output of spindle. 096 seconds STEP_SCALE = 1600 the 1600 STEP_SCALE came across with your previous ini file - my servo is set for 8000 steps/rev - should that not be 8000? It is so in the spindle section : DIRSETUP = 10000 DIRHOLD = 10000 STEPLEN = 1000 to increase the maximum possible step rate. maxvel is too big for current step timings & Could it be that something has changed within Linuxcnc its self before it passes the "Sxxxx" value back to the mesa hardware. 003125 mm and to increase of decrease movement by 0. I noticed some errors Generated by PNCconf at Sat Oct 3 17:03:13 2020 # Using LinuxCNC version: UNAVAILABLE # If you SCALE = 2000. , Volts for an amplifier DAC. You can do that from within AXIS, 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. Surely I don't need both / which one do I need / is one of them redundant? INPUT_SCALE = 4000. dreynolds; It is difficult to say exactly where your problem might be. it is / was set on joint4 as step and dir The by-switch code does invert the response function. wrdfu dkbp cokkw zctsea ojsl hidbre rbyncp qbiuee ibmt ykyod