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Topics - skfisher

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General Mach Discussion / RE: z-axis depth problems
« on: November 07, 2010, 10:13:15 PM »
I have a BlueChick CNC machine from Buildyoucnc.com. 


Here is the situation I find myself in frequently. I am carving a sign first with an 1/8" endmill for the rough pocketing and then I switch to a 1/16" endmill for the final profiling of the letters. I have a basic auto-zero plate to zero the z axis to the work surface between tool changes. For the 1/8" endmill if my final depth of cut is set to -.125" when I am done I measure anywhere from -.125" to -.130" which for me is ok. Then I switch tools to the 1/16" endmill which is programmed to cut to the same final depth of -.125". By the time the 1/16" endmill MOP is finished the overall depth can be anywhere from -.16" to -.18".

I have tried the following:
1. Cleaned the lead screw and reapplied a dry lubricant.
2. Slowed the z axis velocity down to 20ipm, accel to 2, step pulse to 3, and dir pulse to 5.
3. Tightened the collet to ensure the end mill is not slipping.

So far I have been unable to erradicate this problem. My x and y axis (belt drive, bluechick) are fine.

I am at a loss. Any help would be appreciated.

I have the 270oz in motors and should have the 425ozin motors in the next week. I had some concern that the torque on the 270ozin motors was causing some lost steps. I am also puzzled by why the problem seems more pronounce with the small endmil.

Sincerely,

Stephen

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