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Author Topic: Motor Tuning  (Read 10920 times)

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Offline m4uk

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Re: Motor Tuning
« Reply #50 on: March 01, 2013, 07:13:14 AM »
Set stock diameter to 1'' and touched X to side of stock and then set zero in Mach, also set zero with dial indicator.

Did a G54 X0 and the dial reads .002'' under. So 66 version is .0035'' under with that command and 57 is .002'' under. Better

Now set stock DIA to .995 and touched X, did a G54 X0 and the dial reads .0045'' short, so better than version 66 of .005'' but not by much.

if I do individual steps of .100'' so G54 X+.9, G54 X+.8 etc... and work my way in, then each is bang on correct.

Cutting test:




Offline m4uk

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Re: Motor Tuning
« Reply #51 on: March 01, 2013, 07:25:52 AM »
Please explain to me how one command gives an error of .0015'' and another gives an error of .0045''.

Or why changing the stock diameter causes the error to change from .0035'' to .0045'', because I can repeat these all day long.

Or how taking .0005'' cuts on a 1'' stock down to .500'' ends up being .485'', out by .015''

Do any of the measurements I have provided look like I have loads of slop in the mechanics, please tell me because I cant work this out.

Offline Hood

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Re: Motor Tuning
« Reply #52 on: March 01, 2013, 07:44:03 AM »
I am unsure why you are having to call a G54, it may be something to do with the standard lathe screenset, Rich may be able to answer that?
I would have thought you were in G54 anyway so calling it would have no effect.
I also do not understand what you mean by changing the stock diameter? If setting the X DRO to a value then that is you changing the offset (G54 unless you have called some other offset) not changing the stock dia. Maybe I am just misunderstanding what you are meaning.
Hood

Offline m4uk

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Re: Motor Tuning
« Reply #53 on: March 01, 2013, 08:56:35 AM »
Just discovered that he jumper on X motor driver was set to 3A and should be 6A, have changed it and am testing again.

Offline m4uk

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Re: Motor Tuning
« Reply #54 on: March 01, 2013, 09:25:08 AM »
Just turned .489'' after asking .500''.

The guy who set up the lathe did not set the jumper on the X card correct.  >:( >:( >:( >:(

So much of my time wasted and yours Hood.

Thanks for all your help on this. There are a few niggles to iron out yet but its working a lot better.

Offline Hood

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Re: Motor Tuning
« Reply #55 on: March 01, 2013, 09:56:51 AM »
Good to hear :)
  BTW I would stick with 057 ;)

Hood

Offline m4uk

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Re: Motor Tuning
« Reply #56 on: March 01, 2013, 05:54:57 PM »
I have a slightly different problem now. :(
Could not get NSF turn to work in version 57 or the other turn wizard to show any part shape display so had no option but to go back to 66.
On two occasions now the machine has come to the end of a cutting pass, withdrawn the tool but rather than move in + to restart the cut the it has started from the position it was at and cut further down the stock. Somebody said that the rapids could be too fast and the code thinks it has returned to the beginning but in fact has not moved at all. Please can somebody advise me what to do, I have reduced z velocity from 35 to 30, is there a guideline for this at all please.

Offline Hood

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Re: Motor Tuning
« Reply #57 on: March 08, 2013, 01:08:32 PM »
Does indeed sound like you may be stalling  but you should hear that easily? does the motor aqueal when it happens?
Hood