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Author Topic: losing steps on z-axis (help)  (Read 5037 times)

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losing steps on z-axis (help)
« on: September 24, 2012, 09:56:28 PM »
Hi and I would greatly appreciate some help figure out why I lose steps or that is what I think is going on with my machine.....
I have this setup
https://www.finelineautomation.com/store/show/FLA100-00

with these electronics
https://www.finelineautomation.com/store/show/EL-0007

on X & Y I have 5 start screws and on Z I have single start screw.
during a job at some point the Z thinks zero is higher than it originally starts at. X & Y are perfect.

Thanks -
Keith

Offline RICH

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Re: losing steps on z-axis (help)
« Reply #1 on: September 25, 2012, 06:43:59 AM »
Sounds like the Z is skipping steps. Experiment some, lower the max X&Y velocity.. Does this happen at a particular part of the code or is it random.
RICH
Re: losing steps on z-axis (help)
« Reply #2 on: September 26, 2012, 04:34:38 PM »
Been playing with the velocity settings like you suggested and still no fix.... :(

It is really odd - The z axis is always a bit higher at the end of the job than where it started. Where it thinks zero is changed almost every time.

Offline RICH

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Re: losing steps on z-axis (help)
« Reply #3 on: September 26, 2012, 05:20:52 PM »
What kind of work are you doing?
Post your xml file.

What is "a bit higher"?
Do you have the steps per unit set accurately for the Z?

RICH
Re: losing steps on z-axis (help)
« Reply #4 on: September 27, 2012, 04:09:23 PM »
Will post my XML when I get back home along with everything I have about my setup. Thanks

A bit higher - The bit is no longer even touching the wood it was cutting to begin with.

Offline Fastest1

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Re: losing steps on z-axis (help)
« Reply #5 on: September 28, 2012, 02:15:28 PM »
Is everything clean in the Z platform/carriage? Does the ballscrew spin easily by hand (or have you checked?). I just discovered a similar problem in my mchine (and my bad technique for gib adjustment) however you appear to have linear slides so I have no idea if tension is adjustable simialr to gibs.
I want to die in my sleep like my grandfather, not like the passengers in the car! :-)

Offline Fastest1

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Re: losing steps on z-axis (help)
« Reply #6 on: September 28, 2012, 02:16:41 PM »
Is your plunge rate set too high and loosing the steps right away?
I want to die in my sleep like my grandfather, not like the passengers in the car! :-)
Re: losing steps on z-axis (help)
« Reply #7 on: September 29, 2012, 12:07:54 PM »
Is everything clean in the Z platform/carriage? Does the ballscrew spin easily by hand (or have you checked?). I just discovered a similar problem in my mchine (and my bad technique for gib adjustment) however you appear to have linear slides so I have no idea if tension is adjustable simialr to gibs.

Simple answer is YES all is good in that aspect.
Re: losing steps on z-axis (help)
« Reply #8 on: September 29, 2012, 12:09:31 PM »
Is your plunge rate set too high and loosing the steps right away?

No the first half of this particular job is perfect. And it is not consistent when it will start losing steps. I repeated the same job many times and it is not in same area where it loses steps.

This weekend I will be able to post some pics and my XML file.

Thanks
Re: losing steps on z-axis (help)
« Reply #9 on: September 29, 2012, 12:31:13 PM »
I have this setup
https://www.finelineautomation.com/store/show/FLA100-00

with these electronics
https://www.finelineautomation.com/store/show/EL-0007

Attached is my zipped up XML file...

I have played with velocity and acceleration and regardless still same problem.
I have a single start screw on Z
and 5 start on X&Y

Thanks