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#13
 
09-21-2004, 09:51 AM
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| Dear Sir: Assuming the only source of error is the rack, you can get precision rack in 11" lengths from several sources. These can be QUITE accurate (.002 per 11 inches, precision 1; .0006 per 11 inches, precision 3). The accuracy of commercial rack is also quite good. Further, by using a gauge and sections of rack, you can restore the desired accuracy at each junction. We used to do that on long (50') gantry machines. Regards, Jack C.  |
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#14
09-21-2004, 10:06 AM
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| You can do just what I.J. has done with his Z axis retro. He added ball screws and attached it to the quill on the front side.
__________________ Thanks Jeff Davis (HomeCNC) http://www.homecnc.info (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |
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