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Author Topic: Mill or Turn?  (Read 3611 times)

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Offline Davek0974

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Re: Mill or Turn?
« Reply #190 on: May 26, 2019, 06:57:42 AM »
Its not the motor/encoder/spindle bearings

I swapped the motor for my X axis one and got same fault, the X Y Z motors never ever reach full speed so never see the issue.

Its not the spindle bearings/heat causing as it faults with belt removed.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Hood

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Re: Mill or Turn?
« Reply #191 on: May 26, 2019, 07:36:32 AM »
Shame you are not closer as you could have tried out one of my drives/motors on your CSMIO to see if there was an issue.

Offline Davek0974

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Re: Mill or Turn?
« Reply #192 on: May 26, 2019, 07:47:24 AM »
Yeah, thanks for the offer.

Been looking at drives, I know these are cheap for a reason but surely they should work?

I still don't know if the signal quality is an issue.

It runs fine open-loop so its definitely encoder related.

I have no other drives to try out, if i was to buy another i would have to be 100% certain it would work first and it would need to be affordable i.e. probably 2nd hand.

I know this issue popped up on my first build, checked the thread but cant find it, i think it was when bench testing a drive and CSMIO - it would fault out but back then i put it down to lack of set up etc, since fitting on machine, none of the drives have ever reached full speed so the problem never returned.

Doesn't help but i'm sure it happened.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Hood

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Re: Mill or Turn?
« Reply #193 on: May 26, 2019, 08:48:28 AM »
On the Chiron I initially had problems with the spindle drive faulting. Can't recall exactly in which way things faulted, whether it was the drive or the CSMIO. Ended up being the cable I had for the encoder to drive, made a new cable up and all was fine.

I don't really think it will be the drives or encoders as such but maybe just the signal output from the drives is not strong enough to push out to the control. Are they just straight through outputs or are they buffered?

Offline Davek0974

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Re: Mill or Turn?
« Reply #194 on: May 26, 2019, 08:59:32 AM »
Manual shows them as buffered outputs, AM26ls31 line driver.

I have tried two cables - my go-to tester which was a centronics printer cable, now i have made a new cable with proper encoder cable, twisted-pair, shielded etc, damn expensive stuff too.

The cable is less than 1m long.

I cant find any tech spec on the CSMIO inputs though other than max freq is 6Mhz
« Last Edit: May 26, 2019, 09:06:01 AM by Davek0974 »
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Hood

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Re: Mill or Turn?
« Reply #195 on: May 26, 2019, 09:34:52 AM »
Don't suppose you have a spare encoder you could chuck up and use that for feedback to see if it is any better?

Offline Davek0974

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Re: Mill or Turn?
« Reply #196 on: May 26, 2019, 09:44:17 AM »
Not really, i do have a single-ended one somewhere, would have to order a line-driver to get differential output and its only 1024 pulse IIRC
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Hood

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Re: Mill or Turn?
« Reply #197 on: May 26, 2019, 09:55:53 AM »
Does your drive have a 5v and 0v connection for powering encoder? If it does you could maybe try connecting the 0v from the drive to the 0v on the encoder input of the CSMIO and see if that helps. Not sure if I have mine connected that way or not but I do remember that I had to use it on the lathe when I was using a CNC Building Blocks breakout board.

Offline Davek0974

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Re: Mill or Turn?
« Reply #198 on: May 26, 2019, 12:12:14 PM »
Great minds and all that...

I did that this morning after RTFM again - its a bit vague and one diagram shows no connection, another shows the 0v connection.

The are connected now but it made no difference. :(
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Hood

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Re: Mill or Turn?
« Reply #199 on: May 26, 2019, 12:40:36 PM »
Oh well, it was worth a try I suppose.