For some reason my shapeoko 5 makes the first pass a lot deeper than the rest of the passes.
1/4 bit 0.060 depth plunge 15 feed 75. Cutting mdf. It appears thats the first path is about 0.1875" and makes a terrible noise.
I have surfaced the machine bed but it doesnt seem to matter.
Whats going on with this machine? Im having to watch it make the first pass and slow it dow to like 10% speed then after that i resume cutting speed.
How is your stock setup? Top of the part or bottom? Are you using the correct stock thickness for the MDF?
What about the depth of cut that you have set for your tool?
Usually this is caused by a mismatch between job setup:
https://carbide3d.com/hub/courses/create/job-setup/
and how origin is set relative to the stock:
https://carbide3d.com/hub/courses/running-shapeoko/movements-zeroing/
I find that opening the .c2d file up and drawing a box which matches the specified dimensions (draw up the cut in profile if need be) or moving the machine to the origin and then using a tape measure to measure out the dimension(s) in question will make clear where things should be lining up but do not.
And are you setting the machine Z-axis zero point to the Top of the MDF?
If the Z-axis zero is set below the top surface of your stock material with that project setup, then it’s going to cut extra deep on the first pass.
What method are you using to set the Z axis zero? If using the bit zero, make sure it is sitting on top of the workpiece when setting the Z axis by itself.
I set all 3 axis with the bitzero. I holdnit on the corner. The legs stop it from moving then it raises up and sets the z.
Alright, that should be setting the Z-axis zero to the top of the stock then - unless the BitZero hardware version is not set correctly for your machine.
Which version of the Bitzero(v1 or v2) do you have? And is Carbide Motion setup to match?
Also, before running the job, you can check the position of the Z-zero - move the spindle away from the stock & then hit the Jog to Z-zero. You can then visually confirm that the end of the bit lines up with the top of the stock.
I have V2. I would have to look at the software again to verify its correct. I can check home fir reference but it all looks fine.
Note when setting the zero using a BitZero there are two positions:
I use onbthe corner for all zeros
Are you positioning the unit as shown at:
After you use your bitzero, jog the Z so it’s touching the top of the part. Does Z read 0.00?
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