RE: [CAD_CAM_EDM_DRO] Re: Newbie - Z-axis slipping

I've soon LOADS of credible explanations for the possible
cause of the problem - Now waiting to see what the REAL problem
was - Are we going to get an answer soon ? The suspense is driving me nuts !

Dave Fisher UK

-----Original Message-----
From: brian reid [mailto:bbrreid2001@...]
Sent: 03 February 2004 22:07
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: Newbie - Z-axis slipping


Is the drill being pushed back into the chuck

jmosufsen <jmosufsen@...> wrote: --- In
CAD_CAM_EDM_DRO@yahoogroups.com, "Janice"
wrote:

> I'm brand new, self taught on my CNC router/engraver. I am
> currently using a single drill point function where I am drilling

30-

> 90 holes per part, at a precise depth of 0.043. I am losing depth
> starting at about hole 25, and losing up to .030 worth of depth

over

> the course of the remaining holes. Am I expecting an unreasonable
> level of precision, or are there some explanations for why a Z-axis
> would lose depth? Thanks in advance!

Chances are pretty good that your depth loss is due to thermal
effects (e.g., thermal expansion). Even stiff, heavy-duty industrial
CNC machines need to have their offsets readjusted after they warm up
or after they've been running for a while.

Jesse


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