I am at a loss to explain what could cause this. I noticed that I was getting lines at each successive depth on one side of the pieces being cut. I thought my spoil board may have warped so I started to resurface the spoil board and noticed that the Z axis was not aligned with the Y axis so I spent a few too many hours tramming the the Z for both x and y so that my surface came out as smooth as I could get it whether surfacing in the x or y direction. Great.
Then I put a dial indicator on the spindle and when I ran the Y axis there was a .010" difference over a 7" in space!!! That can't happen can it? I mean even if the Y axis was tilted the surfacing bit would follow the tilt and the distance to the spoil board would remain constant, right?
I ran an 8x8 test on a board screwed to the base, ran a 1.375 surfacing bit first in the x direction, same slope in the Y. Then ran another surfacing done in the Y direction, same slope in the Y. These were ran at 20 ipm and 15000 rpm to make sure that there was no rigidity issues. I have been able to verify that the Z screw is not moving during surfacing nor is the bit moving in the collet.
Can anyone explain where my logic is failing?
Surfacing Anomaly
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- Vectric Wizard
- Posts: 1717
- Joined: Sun Sep 23, 2012 12:14 pm
- Model of CNC Machine: CNC Shark Pro, Probotix Meteor 25" x 50"
Re: Surfacing Anomaly
I had a student Friday cutting a row of pockets for a finger joint. Although all the pockets were created to cut the same depth only a couple of them were even close and none were exactly what they should have been.
What could have caused this? Turned out it was a loose bit. Bit was slipping in the collet.
What caused your .01 error over 7"? The material may have warped after it was cut.
What could have caused this? Turned out it was a loose bit. Bit was slipping in the collet.
What caused your .01 error over 7"? The material may have warped after it was cut.