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Author Topic: Z-axis changing during job & depth is increasing  (Read 197 times)

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Z-axis changing during job & depth is increasing
« on: July 17, 2021, 04:35:24 AM »
Hello

I have a wood CNC. While I wanna cut a borderline or when I wanna make a 2d model with V-Craving in artcam , the Z axis increasing over time and depth of job is deeper than programmed. For example I set depth on 4mm , in the end depth was increased slowly and reached to 7.734mm.

I don't know where is problem and why it should be work like that. I tried different ways in artcam and changed the model but it's still do wrong job .

Thanks for your guidance 🙏

Offline JG

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Re: Z-axis changing during job & depth is increasing
« Reply #1 on: July 17, 2021, 05:16:33 AM »
Is the DRO showing the Z depth increase or is it just the physical depth ?
If he later then the possibility is that the tool is creeping out of the collet - ie. it is 'loose'  -  this will be exacerbated if the cutter is spiral flute 'up-cutting'.
It has happened to me!!

 
Re: Z-axis changing during job & depth is increasing
« Reply #2 on: July 17, 2021, 05:52:57 AM »
In DRO all things are true , x,y,z coordination are corresponds with real measurements.

Drawing file is correct too , there is no problem in drawing.

But Angels and Depth changing during job, I'll attach the done job picture.
Re: Z-axis changing during job & depth is increasing
« Reply #3 on: July 17, 2021, 10:37:40 AM »
This is my drawing and setting of milling program.
Re: Z-axis changing during job & depth is increasing
« Reply #4 on: July 17, 2021, 10:41:22 AM »
This is my drawing and setting of milling program.
Re: Z-axis changing during job & depth is increasing
« Reply #5 on: July 17, 2021, 01:11:13 PM »
Wrong job

Offline JG

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Re: Z-axis changing during job & depth is increasing
« Reply #6 on: July 17, 2021, 01:59:57 PM »
It may seem like a silly question but ....   

Is the surface of the work really flat? ie. co-planner with the CNC table.

Do you skim the surface before the V-Craving run?
I don't know the ArtCam program - I'm just applying basic logic.

Offline Graham Waterworth

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Re: Z-axis changing during job & depth is increasing
« Reply #7 on: July 17, 2021, 02:45:32 PM »
It looks to be progressing deeper as the job goes so it could be loss of rapid retract steps or is the board lifting toward the middle or as already stated is the bed parallel to the axis rails.

From the start its too deep into the material as per your drawing.

How is the material held down on the table, vacuum table or side clamps.
« Last Edit: July 17, 2021, 02:51:07 PM by Graham Waterworth »
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