Re: Newbie - Z-axis slipping

Hello,

Losing steps on the "up" is more likely. And will result in gradually
deeper holes (because it didn't go up as far as it should have)

What's troubling is that according to the post the first 30 holes are
okay, THEN it starts going deeper. So I'd look for a feedrate change,
or something that corresponds to the location, either physically(are
you moving near your cabling--after the 30 holes--and getting
crosstalk?), or a "location" in the program...

(Some programs act strange when unexpected characters are found in
the toolpath file. These can be "invisible" characters, like
linefeeds,tabs, or returns.)

Hope this helps,

Ballendo


--- In CAD_CAM_EDM_DRO@yahoogroups.com, Vajk Fekete
<vajk.fekete@o...> wrote:

> hi,
>
> My guess is, that you are loosing steps on Z downwards moving, and

this

> is accumulating during the work.
>
> vajk
>
> Dave Fisher wrote:
>
> > Could be your work surface is not flat ?
> > are the problem holes always in the same area ?
> >
> > Or your gantry / pantograph is not at absolute right angles to the
> > worksurface.
> >
> > Easy test for all this - just clip a dial gauge to your Z axis
> > and move it around the table - keeping a good eye on the readings.
> >
> > Rgds
> >
> > Dave Fisher UK
> >
> >
> > -----Original Message-----
> > From: Janice [mailto:bigforkshop@y...]
> > Sent: 30 January 2004 19:57
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Newbie - Z-axis slipping
> >
> >
> > 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!
> >
> >
> >
> > Addresses:
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[Moderators]

> > URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:

aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach
it if you have trouble.

> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this

to be a sister site to the CCED group, as many of the same members
are there, for OT subjects, that are not allowed on the CCED list.

> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY

POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
EXCEPTIONS........

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