Re: [CAD_CAM_EDM_DRO] Re: 3D Contouring - Loss of Accuracy

If you have a portion of program that sets home again, IE sets axes to
zero, this will cause an accumulatiing error. Sometimes people use this
trick to run a sub in abs coords, at different location(s), setting and
re-setting zero to make it work where you sendf it. I tried it with a
Bridgie years ago and it crept around on me too.



At 07:06 PM 12/17/02 -0500, you wrote:

>> Date: Tue, 17 Dec 2002 14:12:16 -0500
>> From: Peter <prenolds@...>
>>Subject: 3D Contouring - Loss of Accuracy
>>I'm stumped! On my BP-clone knee mill, I've tried everything I can
>>think of and nothing seems to produce the results I'm looking for. What
>>I find is that running a large 3D file I gradually accumulate a small
>>error typically in one of the most active axes which often exceeds 0.3mm
>>or .012" after half an hour to an hour of running time. It is usually
>>in the same direction, but not always. Below are some of the things
>
>Look for a mechanical slippage. Possibly a loose set screw on a motor

shaft or coupling.

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