<rant on>
Just a quick comment about encoder counts. You have a 8mm/rev ballscrew. Assuming your motors are connected to the ballscrew 1:1, then with an encoder set a 4194304 counts per rev, you have a theoretical resolution of 1.9 nanometers per encoder count. Even the best machine tools are going to be hard pressed to hold 1/5000 that accuracy (10 microns). If you had your encoder set to 8000 counts per rev, that would mean that each encoder count was 0.001mm - still 10 times your machine accuracy.
Approached from another direction, Centroid has stated previously that their encoder interfaces have a bandwidth around 2MHz. Assuming you run rapids around 10,000mm/min with a 8mm pitch screw, that's 1250rpm at the motor, or 21 revs per second. If you have your encoder set to 4194304 counts/rev then you need a bandwidth of 87MHz or 40 times more than Centroid provides.
Just because the encoder can generate an interpolated resolution of 4 million counts per rev, doesn't mean more is better. I don't know what kind of encoder is used in the EMJ motors, but my guess is it's magnetic with 100-1000 pole changes - physically less accuracy than a 2000 line glass encoder. The magic of software is making it seem amazingly accurate by subdividing those 1000 divisions into even smaller make-believe numbers.
Try this analogy. You just put a 10 foot diameter speedometer in your car and now you can read out your speed down to 0.001 MPH. Can you really adjust your foot on the accelerator such a minute amount to change your speed by 0.001 MPH? Could you do 0.01 MPH? I bet you'd be hard pressed to even do 0.1 MPH.
Overloading any system with extraneous data does not make it better.
<rant off>
Estun Servo Tuning
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Re: Estun Servo Tuning
Cheers,
Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
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Re: Estun Servo Tuning
Pn200 = 16384 if I put this number in the counts/rev it faults out. Nothing is working as per our instructions Tech Bull or anything. I have paid for your support. please let me know when I can call you to team viewer this machine and get it set up. I cannot be wasting my time like this much longer.
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Re: Estun Servo Tuning
"Tblough" I understand what you are saying exactly. But any numbers less than 400000 the thing faults out. this is what I do not understand.
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Re: Estun Servo Tuning
Counts/rev is 4 x Pn200 = 65536.MRW wrote: ↑Wed Aug 14, 2019 12:48 pm Pn200 = 16384 if I put this number in the counts/rev it faults out. Nothing is working as per our instructions Tech Bull or anything. I have paid for your support. please let me know when I can call you to team viewer this machine and get it set up. I cannot be wasting my time like this much longer.
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Re: Estun Servo Tuning
Ok Ill try this again as well.
Just to be clear this gets input into the encoder counts per rev. in the motor config settings correct?
Just to be clear this gets input into the encoder counts per rev. in the motor config settings correct?
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Re: Estun Servo Tuning
Please give us a call at 814-353-9290 Option 4 for Tech Support. We are open 8am to 5pm EST. A quick Teamviewer session can probably get your issues resolved.MRW wrote: ↑Wed Aug 14, 2019 12:48 pm Pn200 = 16384 if I put this number in the counts/rev it faults out. Nothing is working as per our instructions Tech Bull or anything. I have paid for your support. please let me know when I can call you to team viewer this machine and get it set up. I cannot be wasting my time like this much longer.
When requesting support READ THIS POST first. https://www.viewtopic.php?f=60&t=1043
Please ALWAYS post a FRESH report. To make a report: https://www.youtube.com/watch?v=Ecvg0VJp1oQ.
(We pride ourselves on providing timely solid technical support but, without good information we may not be able to help and/or reply until such information is posted.)
Please ALWAYS post a FRESH report. To make a report: https://www.youtube.com/watch?v=Ecvg0VJp1oQ.
(We pride ourselves on providing timely solid technical support but, without good information we may not be able to help and/or reply until such information is posted.)
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Re: Estun Servo Tuning
Issue resolved.
I will release a revised TB291 in the next few days explaining the setup with more detail.
I will release a revised TB291 in the next few days explaining the setup with more detail.
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Re: Estun Servo Tuning
Thanks so much. Now I can hopefully get this thing making parts.
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Re: Estun Servo Tuning
Can someone tell me how a properly tunes drive looks like? For some reason I cannot seem to get mine to where the instructions say I should be at. I can get it running fairly good in low rpms. but as soon as i get up over 200 it faults out. I am not sure what is wrong, what I am doing right or wrong and where these scopes should really be since I cannot get anything to match even close to the Tech bulletin.
Report is attached.
Report is attached.
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- report_0320190764_2019-09-03_11-48-59.zip
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Last edited by MRW on Tue Sep 03, 2019 11:55 am, edited 2 times in total.
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Re: Estun Servo Tuning
maybe it is time for a teamviewer session with josh in support. email him to arrange.. support@centroidcnc.com
Need support? READ THIS POST first. http://centroidcncforum.com/viewtopic.php?f=60&t=1043
All Acorn Documentation is located here: viewtopic.php?f=60&t=3397
Answers to common questions: viewforum.php?f=63
and here viewforum.php?f=61
Gear we use but don't sell. https://www.centroidcnc.com/centroid_di ... _gear.html
All Acorn Documentation is located here: viewtopic.php?f=60&t=3397
Answers to common questions: viewforum.php?f=63
and here viewforum.php?f=61
Gear we use but don't sell. https://www.centroidcnc.com/centroid_di ... _gear.html