Thank you so much for pointing this out. That is really good information.

Awesome and welcome to my channel. Yes I will

@@JBWorx Awesome! Thx

I am glad that the video was useful for you !

@@JBWorx sometimes I get the motor doing a -1 and then +1 missed step while in a loop after all signals have stopped.

As long as the axis does not humm while resting I would not worry too much about it as +-1 is such a low movement. Many cannot get the pos error below 12 or even 20.

Thank you OpenDev

Thank you !

Very nice Bryan, I am happy you got the servos going. +-2 is a very good result. Yes metal parts will definitely help to reduce any vibration no matter from where.

Thank you

Unfortunately PID controller set ups are complex. I hated that class in college lol. However a simple approach is to use 1. The position gain as high as possible until the axis stops. 2. Next you set the speed proportional / forward gain 3. You set the “i” value so the integral value smaller that parameter is touchy observe the movement it will become way harder “higher accelerated “ in the turn around point of the loop that you are running. Do all this while looking at the positioning error. If the axis is behind the commanded position you can add to P02-50. Excited to see your results.

You make a movement loop like I showed in the video for the y axis. Now hook into one motor and start the tuning process. Very important is that you have the alarm output hooked up. Otherwise if the motor stops during tuning the controller will not know and keep moving the other side and possibly break something. That’s it, pretty simple really.

The heavier the movable part of the Z-Axis gets the more it will benefit from a smaller pitch ball screw. Have you tried the torque setting for forward and reverse ? This might help as you can add additional torque for the up movement. If nothing helps think about a gas cylinder to support the weight of the Z-Axis. I have a 16x5 ball screw and had a problem one time and found that the movement got into a bind at a certain area of travel. I did not catch it until I move the axis by hand end to end.

Correct, these are 180W servos. I also have the 200w and the Onlinestepper version with 180W. Yes acc is at 850 accept for Z I think it is at 550. The parameter software is 1.7.6 but I have read there is yet a newer one. Also there is a “Budde” version that is supposed to be really good but I have not used it. The motor firmware (bottom right next to all the Status circles) reads as 604

I would like to agree or disagree but I can’t because I cannot look at the parameters right now. I think all I am saying is that there is a second set of parameters that do the same as the first set but only used at a certain state of the drive. Your explanation up top makes sense but I am sure everyone can figure it out from here … I hope 😆 thank you for reaching out.

Initially I ran one on auto tune while I tuned the second one. Once completed I entered the parameters into the other motor and checked that it has an equal following / positioning error.

Yes, I understand what you are saying. So the chart shows the error relative to it’s commanded position. Not going through or back to zero means that there is an error maintained going from pos. A to B. The system is too soft also there could be high static friction that can cause this behavior. If it is friction you can add torque in parameter P02-50. In the PID loop there is also a parameter that always adds to the calculation of the current movement to reach the target position. If this is set too high you will overshoot … anyways to complex to explain here. If you get stuck best is to load the original parameters and start over.

@@JBWorx Thanks for the reply, I'll give those options a try. What is the PID loop? Is this something I can adjust as well? It's worth mentioning that my setup is very very different to yours. I'm using a lead screw actuator as a slider for a pan tilt head for a video camera. So rather than having a spindle on my actuator I have a video camera on a pan tilt head. The Pan tilt head has rotational stages and I control everything from the computer. The head weights roughly 12kg and has a centre of gravity which is about 30cm from the lead screw. I'm certain that all of this will contribute to a very different graph. Regardless I still get accuracy to within 1-2 it's just the issue of it starting in different places on the graph. Anyway, I'll try your suggestions but thought I should mention this too

It is the engineering term for the controller that you are setting all the values for. I did not use this “word” in my video as this is for beginners and I did not want to explain what the proportional-integral-derivative means. It’s complex and a video on its own and really really dry content.

The positioning error is related to acceleration and speed so if I set the acceleration higher it will increase. It might even lock up the axis in the return point. Yes agreed the JMC auto tune is limited however for the starter a tool that can get you started in equipping your machine with servos. I’m my tuning the integral value is really low at 15 so there is a big cushion there if one would set the axis acceleration higher. I did that so that people watching this will not damage their machine. Also the torque added gain value can make a nice difference for higher acceleration.

Ok like to add to the above comment. I just checked the acc in Eding is relative low at 600 mm/s^2. I see also the speed is relatively low at 9m/min. However for the short x axis that value is fine.

@@JBWorx I redid the tuning of the servo's today following your steps. Got it within 3 steps deviation at 9000mm/min and 2500 acceleration (also Eding controller). This has been the best result by far, so I would really like to thank you!. Previously they were stalling really quickly, but that doesn't happen if you follow you're steps. Even the settings are pretty close while I have a much heavier machine, Sorotec ST0704 and servo's are belt driven with a 3:1 reduction. Only thing I'm seeing now is the servo is jittering, buzzing at standstill, just 1 step. Not sure what could be the cause of this.

That is awesome !!! So happy ! Ok to eliminate the buzz on standstill lower the value of P02-12. That should take care of it.

I have not worked with this version of the servo. However alarm 060 says you selected the wrong motor for the software. I think these are settings in P00. Have a look at this. If nothing helps download the original data file again, I hope you saved a copy like I mentioned.

No I did not. I had one running on auto tuning and then the other one hooked up to the laptop and tuned it down to +-2 then I worked on the other one also down to +-2. It is totally possible that the motors have not the same parameters and that is ok as long as the positioning error is the same.

@@JBWorx Thanks. I sent you some more questions on Facebook

Ok let’s see if I can answer them.

Thank you for your comment! The inertia value will only change with auto tuning enabled. Unfortunately it is not quite good in this software. The bigger ac servos have a separate move that can be enabled to determine the inertia. This is also available on the OMP version of this motor. Anyways I would start the tuning and monitor the positioning error only if I get unsatisfactory results I will get back to the inertia value. For example there are several values at its max setting and the error is still to big. This is a sign that the inertia setting is wrong. Calculating it is quite a task and in my experience the rotational inertia of the ball screw is always the highest value much higher than the entire gantry. Good luck with your tuning !

@@JBWorx Hi, thanks for the quick response, ill give it a try the next days (weekend the latest) - but maybe i can ask for more information. I am using a iHSV57 6.04 on my Y-Axis. I did configure with autoconfigure P01-02 "1" and P01-03 "23" where small noise startet of the motor. So i went back to 20 and switched to manual mode. Finally i came up with P02-00 - "251", P02-01 - "293", P02-03 - "98" and P02-04 - "0,2". System is quite stiff - Following Error with 1500mm²/s acceleration and 5000mm/s feed is below 5 increments - fine for me. So i started to run my first CNC Program (Spoil Board) but i experience step losses in the Y-Direction. I am milling 50 small Pockets (D15mm with an Helix and an 8mm endmill). So there is lots of acceleration and deceleration due to the helix. Placing a dial gauge before I start, i see approx. 1mm step loss after these 50 Pockets which concerns me because i thougts its closed loop. My best theory is: I did the optimization with a Program Moving +100mm and -100mm (

Yes a couple of ideas: P01-01 has to be set to 0 for a CNC machine please check that. Your gain Settings P02-00 and P02-01 sound too low if you cannot get these increased then have a look at the inertia value. If it is set to 1 then try it at 0,5 and see how it reacts. Also to test if it is really “loosing steps” set the value of P03-15 to the steps of let’s say 0.5mm whatever that is on your machine, remember the value is multiplied by 10. Run your program and see if the machine stops with an alarm. If so your axis are still too soft for the acceleration you expect them to do. Good luck and come back and post your findings please.

@@JBWorx HOOLLLYY i just found it and i am so happy... the issue for my step losses were not caused by the servo software or parameters but the settings for the Pulse Generator - I did use 3200ns signal duration (STEPLEN in LINUXCNC) for X Servo which worked great and 3050ns for the Y Servo which worked somehow but not propperly. now that i changed to 3200 on Y there is absoultely no step loss and the system works. I will go on fine-tuining the servos now. Thanks a lot for your help!

Very good that you figured this out ! Yes pulse frequency, steps/ rev and travel/ step all need to be set correctly in order to move the expected distance.

Thank you very much for your positive feedback !! Unfortunately I have no access to the software at the moment as I am traveling (Vacation). I think the inertia value itself for my machine is between 0.5 to 1.2 depending on the axis. You can try the switching with a second set of parameters it works well, but it makes only sense if you have trouble at really low speeds (axis/ motor noise) and are forced to change to soften the set up causing it to be at a not acceptable pod. Error. Otherwise don’t go through the trouble. Have fun !

@@JBWorx Thank you for your quick response! No hurry with anything! My own machine is just growing up, but I am on the JMC servos since they are on the market and play around with them to understand the sense of each single parameter. Firstly, for my own knowlege, 2nd - I evaluate parametring processes not on my own machine, I am a 1st level supporter in a facebook group for JMC servos and attend people with the parametring of these motors and try to write a "parametring for dummies" to help people to get them running. Inertia is (in my eyes) one of the most important things to know and to set in the process. Other as in other servos, there is no measuring tool to come to a real value, simultaneously it has great influence to the process itself. That's a problem I did not come over all the time. I set it to factory default, knowing that this must be just a 1st approach. Well, I will gain switching give a try if my machine has the first axis motor mounted, and I think you are right with your assumption that it's most senseful for low speeds. Because I rarely saw great differences at higher speeds, if the loop was around 2-3000 mm/min. Your tuning in the end is a very fine tuning... BTW - did you try out the latest version of software, V. 2.13? it is much more reliable in connection and it has better hints in the help text and - the sample rate of the oscilloscope ist much higher than it was in 1.76! I can recommend this version, it's a real advance! The GUI is much better and make more sense in many regards. Thanks for your time and have a great time!

@@MrMiffy08 you are correct on the inertia. If you max out parameters and cannot get the error down or the opposite happens that several values are extremely “touchy” then this is an indicator that the value of the inertia ratio is incorrect. I suggest you start the tuning process close to the speed that you would want to machine most of the time. On s you are happy move the axis that is typical for homing or even slower. Often the slow speed will result in humming or even lock up an axis. This is the perfect opportunity to use the second set of tuning parameters. Let me know how it works out. You can also reach me on my webpage www.JBWorxStudio.com

@@JBWorx Thanks a lot, Joerg! I will give my best and maybe contact you again if I know more on my own machine!

@@MrMiffy08 perfect !!!

Glad that you got something out of the video that is all I can hope for. So I choose JMC and also OMC (stepperonline) for the price point. They are an excellent value and if you can not tune it or burn one up you are not out thousands of dollars. The encoder on the OMC motor is better than the JMC but they only offer the 180W version no bigger once as of today. Is it good for a “big” gantry? Well often it is not the total weight of the gantry but more the parts that rotate that are attached to it like a much bigger ball screw. The inertia value of the rotational parts are huge in comparison to the mass of the gantry. So the 180-200w JMC will probably cope fine with a double driven gantry weighing 50-70 kg. I build one with 50kg and the motors have no problem at all driving it with high acceleration and 6m/min speed. And thank you for your comment.

@@JBWorx thanks for your response i have planned making machine with aluminum extrusion frame work area 6*10 ft i can buy 400 watt jmc integrated servo motor with planetary gearbox and rack and pinion movement system is good choose for this type machine with big gantry (but not so heavy gantry)?

@@saeedkamali2032 400W is quite a lot of power remember you can temporarily get 3-5 times the rated power from the servo. Also if you use a gear box in between the weight will be less important (sure it depends also on the ratio of the gearing). So 2 motors or one motor for the 10ft axis of your machine ?

@@JBWorx 2 motor on 10 ft i know 400 w is a lot more than I need the problem is shaft of this integrated servo motor planetary gearbox input need 14 mm shaft and 200-180 have i think 11mm shaft. or maybe I must use jmc gearbox (and this hard to find in my country)

Good on the 2 motors ! Ok have a look at “shaft sleeve bore adapter” that might help you.

Yes, so just set P01-02 to 0. This will allow the manual change of all values.

@@JBWorx Thank you for your fast response. I have set the value of P01-02 to 0. the only values beside P01-02 and P01-03 I can write to the motor are : P03-15, P02-19, P02-31, P02-32, P02-41. That´s it. When I try to write to all other addresse i allways get a small popup-box with an OK - button on the screen. on pressing OK the value set to the original value.

Oops that does not sound right. Best is to reload all parameters. Check online to find the parameter set.

@@JBWorx hurra, I made it. I changed from my HP Laptop to an other computer (standart 64-bit cpu) and with this the programm works ok. Thks for your help.

Excellent that you figured it out !

Hmmm was für eine Sprache hast du eingestellt ? Sollte English sein da sonst Komma und Punkt vertauscht sind …

@@JBWorx Du bist doch Deutscher das kann man wunderbar am deinem deutschen "th" erkennen. Warum dann auf Englisch

@@JBWorx gut ich frag jemand anderes

Weil ich in den USA wohne

Ok nochmal die Spracheinstellungen in der Software sollten English sein da sonst bei deinen eingetragenen Zahlenwerten der Punkt als Komma gesetzt wird und die Firmware vom Servo das nicht beißen kann.

Nick, this is awesome !!! Thank you so much for posting it !!