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Author Topic: Position Errors Only on Diagonal Moves  (Read 10389 times)

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Offline BR549

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Re: Position Errors Only on Diagonal Moves
« Reply #50 on: January 15, 2015, 08:52:35 PM »
Have you by chance played with the Gib adjustment since you got the machine ??? Looks like the axis is rocking creating 2 good corners and 2 bad corners.

(;-) TP

Re: Position Errors Only on Diagonal Moves
« Reply #51 on: January 15, 2015, 09:15:21 PM »
The Torus PRO uses LM type ball slides for the Z and parallel type gibs on the X and Y.
I'd do a good pry bar type backlash check on all of the screws and mounts.

I looked this machine over at Cabin Fever last year. You can tell it's chinee, but is pretty stocky.
Russ

Offline Hood

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Re: Position Errors Only on Diagonal Moves
« Reply #52 on: January 16, 2015, 02:55:21 AM »
Do you have software for the servo drives? Normally with modern AC servos you should be able to hook up to a computer via serial port and monitor everything via software.
You should be able to see what the max +/- errors are and also you should have an inbuilt scope so you can see how the axis is behaving, ie is it over shooting, what the damping is like etc. You should also be able to see what the following error is set to in the software.

Hood
Re: Position Errors Only on Diagonal Moves
« Reply #53 on: January 16, 2015, 08:45:40 PM »
Here is the thread on cnczone: http://www.cnczone.com/forums/showpost.php?p=1624744 this thread documents the tests I have run now.

 

Updated broken kink/incomplete link.
http://www.cnczone.com/forums/novakon-systems/207688-torus-pro-log-13.html
For those of us curious to follow along.
I'm sure Nate will post back with his findings. :)
Thanks

Position Errors Only on Diagonal Moves
« Reply #54 on: January 17, 2015, 06:04:20 PM »
Found the problem. A setting on the Y servo drive was not set properly.

The results are beautiful, my bearings now fit perfectly and the finish is much better. Thanks to everyone for the suggestions provided!

Test circle for bearing fit (I cut it over top a previous test cut so ignore the round partial cuts you see.)



The test piece. Bearing just slips in al nice and snug. Finish is excellent too.







Nate
Fine Line Automation
www.finelineautomation.com
Re: Position Errors Only on Diagonal Moves
« Reply #55 on: January 17, 2015, 06:18:17 PM »
That's great Nate ... simple as that.
I love it when a plan comes together.
Appreciate you posting back, this may be a "recommended reading" post for future reference.

Good job.
Thanks again,
Russ
Position Errors Only on Diagonal Moves
« Reply #56 on: January 17, 2015, 06:34:19 PM »
That's great Nate ... simple as that.
I love it when a plan comes together.
Appreciate you posting back, this may be a "recommended reading" post for future reference.

Good job.
Thanks again,
Russ

It was Ray who suggested checking the parameters. Given this is my first experience with servo drives, I am glad I had some resources to turn to.

Thanks again for all the suggestions!


Nate
Fine Line Automation
www.finelineautomation.com