Zero shift at end of project?

Zero shift at end of project?

Postby bearcat » Mon May 15, 2017 1:02 pm

While carving out a project it appears that towards the end of the process the zero shifted and resulted in the last part of the project not carving. Hoping this was an anomaly (yeah right) I ran it again and had the same outcome. Any ideas what caused this or how to fix it? See attachment for reference. Thanks! Also, I know I ask a lot of questions and don't have any advice to give to anyone that has questions, I hope in time I can help other people out as much as you guys help me out.
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caRVING.jpg
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Re: Zero shift at end of project?

Postby mezalick » Mon May 15, 2017 1:35 pm

If you can post the last dozen or so lines from your G-Code it'll say if it's a program issue.
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Re: Zero shift at end of project?

Postby highpockets » Mon May 15, 2017 3:01 pm

Could be your material is warped or not held down good.

Did the preview in VCP look correct? (pretty sure it did).

Are you using the correct Post Processor?

Try surfacing your material to make sure it's flat then reset your Z 0 to the top of the material (assuming this is how it's set in VCP) and rerun the Job.
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Re: Zero shift at end of project?

Postby bearcat » Mon May 15, 2017 10:52 pm

Material is perfectly planed before going on the bed. How would I go about pulling the last few lines of code from VCP?
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Re: Zero shift at end of project?

Postby highpockets » Mon May 15, 2017 11:02 pm

You don't get the g-code from VCP. The g-code is in a file you saved out of VCP and loaded into your CNC.
If the g-code file isn't too big post the whole file.
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Re: Zero shift at end of project?

Postby bearcat » Mon May 15, 2017 11:23 pm

Here is the file, as an update I created a completely new project with different artwork and size and had the same issue. When I stop the program and tell the machine to go back to 0,0,0 is always shows the bit higher than it originally started. I will not let me upload the .tap file
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mollieTree.crv
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Re: Zero shift at end of project?

Postby flying_flip » Mon May 15, 2017 11:32 pm

Sounds like the router climbed in the bracket as the project progressed.
I had this happen on my Pirahna.
Replaced the bracket, same thing.
Added sandpaper between router and bracket, and no slips.
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Re: Zero shift at end of project?

Postby bearcat » Mon May 15, 2017 11:34 pm

starts out good in both files though?
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Re: Zero shift at end of project?

Postby bearcat » Mon May 15, 2017 11:53 pm

Router position is unchanged after inspection. It doesn't move or shift at all.
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Re: Zero shift at end of project?

Postby highpockets » Mon May 15, 2017 11:57 pm

bearcat wrote:starts out good in both files though?


It would because you are setting the z0 to the top of the work piece, but as flying_flip is pointing out either the bit is slipping in the collet or the whole router is moving in the mount as the job progresses. Another thing that could be happening is your z drive screw could be slipping causing the machine to loose z zero. Check your z stepper motor connection.
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Re: Zero shift at end of project?

Postby highpockets » Tue May 16, 2017 12:00 am

bearcat wrote: When I stop the program and tell the machine to go back to 0,0,0 is always shows the bit higher than it originally started. I will not let me upload the .tap file


This is a mechanical issue, not software or g-code (.tap file).
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Re: Zero shift at end of project?

Postby bearcat » Tue May 16, 2017 12:18 am

Is it just a coincidence that it is repeatable on multiple pieces of planed wood? Does it in the same spot everytime with that project.
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Re: Zero shift at end of project?

Postby bearcat » Tue May 16, 2017 12:25 am

Oh my God, my apologies. It does appear that my collet had become loose. Not.loose enough the feel but loose enough for the bit to slide up. Thank you so much, I feel stupid that it was so simple.
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Re: Zero shift at end of project?

Postby bearcat » Tue May 16, 2017 12:31 am

Working link a charm again! :D. Thanks!
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Re: Zero shift at end of project?

Postby highpockets » Tue May 16, 2017 12:41 am

Great :!:
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