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Messages - cncbobuk

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General Mach Discussion / Circles not Circular???
« on: August 11, 2016, 12:16:52 PM »

Anyone any idea why circles are distorted as in the picture?

Sorry about the link but can't work out how to post the picture here any other way.

Mach 3 on Win 7

General Mach Discussion / Art code 102
« on: August 10, 2016, 10:25:15 AM »
Hi all, just completed my 2nd router construction and doing some testing, however I'm getting a problem with Mach 3 stopping mid cycle on odd occasions.

The program just hangs and reports "Art Code 102" offers to try to recover, which is not successful then I have to click "no" when Mach 3 closes down.

After restarting all is well again.

Any ideas whats happening?

Mach 3 running on Win 7 laptop and e-cut motion control board.

I'm not that experienced with CNC setups but I had a simmilar problem with my Router losing/gaining steps. Turned out to be motor resonance or ringing caused by excessive current drive to the motor. My machine also uses Nema 34 motors and Leadshine HM860H drives, I had to reduce the drive current to less tha half what was set by the manufacturer and now all is perfect. I've no idea if this could be the cause of your problem but could just be worth a try.

All the best, Bob.

General Mach Discussion / Re: Why does my router "Clonk"?
« on: June 27, 2016, 06:10:02 AM »
Dave, you may have just solved my problem. I did a little research on motor resonance and it's a little cleared now. Before adding mass to he motor I decided to play with the current drive, now halved from the original manufacturers setting and low and behold everything is much smoother and after 10 x 100mm cycles up and down the axis has returned to exactly zero. Tada!

It all goes to prove there's a lot to learn and often the simplest things can have the most effect. I'll continue to play with the settings to see if I can perfect them.

Regards and thanks again.

General Mach Discussion / Re: Why does my router "Clonk"?
« on: June 27, 2016, 05:37:18 AM »
Hi Dave, thanks for your input, that does sound like a reasonable assessment. The problem was there when I first got the machine with an NcStudio controller. It was my motivating force behind upgrading to the Mach 3 platform. In desperation I will try adding some mass to the motor shaft or would changing the driver current settings maybe help?

General Mach Discussion / Re: Why does my router "Clonk"?
« on: June 27, 2016, 05:01:54 AM »
Ok guys, a bit more info. I've checked the pulse train to the drive with a scope and there does not appear to be any "ringing" or interference there. I then tried different feed rates to try to see if any were worse than others. The problem is particularly bad at between 400-650 mm/min becoming ridiculous at about 570. I've taken a short video as suggested and attach here, as you will see or should I say hear there is a big problem. As I said previously this seems to disappear completely at rapid feed rates.

Video here https://youtu.be/d1a2sbQnat0

General Mach Discussion / Re: Why does my router "Clonk"?
« on: June 23, 2016, 12:44:53 PM »
I'll give it a go but there really isn't much to see. Hopefully the sound if I can capture it will help. It's peculiar in that it only seems to do it when the axis is moving slowly, if I run it at rapid speed it appears to be OK.

Is it possible it could be something to do with the step per rev setting (currently 1600) resonating with something mechanically?

General Mach Discussion / Re: Why does my router "Clonk"?
« on: June 23, 2016, 10:54:31 AM »
OK just to bring this back to the top, I've changed the Z motor and the driver and all is still the same  :'(
Also checked the wiring and am sure all is good. Any further ideas where to look?

General Mach Discussion / Re: Why does my router "Clonk"?
« on: May 31, 2016, 07:11:43 AM »
Ok, I think I'll start by replacing the "Z" axis drive and see how it goes, maybe a faulty drive?

General Mach Discussion / Re: Why does my router "Clonk"?
« on: May 31, 2016, 05:05:00 AM »
Any chance of a video - it could be backlash, a loose coupling, belt jumping teeth, drive issue :)
Unfortunately there is nothing to see, I've checked the mechanical linkage, belt tension etc and all is well there, it does sound like an electrical issue as it's exactly as when the drive is first powered on.

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