Re: Mogliced Sherline backlash report

It sounds good. Now Let see how long the moglice will last. keep the
groups inform of the result..

--- In CAD_CAM_EDM_DRO@y..., "Brian" <ka1bbg@w...> wrote:
> Hi, just took a look at pictures. Nice work! cul brian f.
> ----- Original Message -----
> From: "Randy Gordon-Gilmore" <zephyrus@r...>
> To: <sherline@y...>
> Cc: <cad_cam_edm_dro@y...>; <devittmach@h...>
> Sent: Thursday, August 08, 2002 1:13 AM
> Subject: [CAD_CAM_EDM_DRO] Mogliced Sherline backlash report
>
>
> > Tonight I had a chance to measure the backlash on my Mogliced
Sherline
> > mill. I have a Starrett Last Word 15-0-15 indicator, which I
held in the
> > spindle using the 3/32" collet. I'm using CNC Pro, which has
fast, slow,
> > and incremental jog. I set incremental jog to .010"
> >
> > First I turned the point horizontal and slow jogged the Z down
until the
> > contact point (sphere) touched the table by about .005" for
preload, and
> > zeroed the dial. I switched to incremental jog and jogged down a
> commanded
> > .010" The dial then read .010". I jogged up one increment, and
the dial
> > read .001" So the Z backlash is .001" I jogged up and down one
increment,
> > and the dial read .000" (i.e. showing .001" backlash again in
the other
> > direction, canceling the original backlash accumulation.) I
repeated this
> > several times to verify that this was a repeatable reading. So
the Z
> > backlash is .001"
> >
> > I did the same for Y, getting .001" backlash. On X, the backlash
is
> .0025"
> >
> > I'm very happy with the .001" Y and Z backlash, and pretty happy
with the
> > .0025" X. I'm assuming that I was more generous with the release
spray
> > than Ron Ginger was, who reported less than a thou backlash on his
> machine.
> > CNC Pro has backlash "compensation" so I will enter these
numbers in the
> > program before I start using the mill again.
> >
> > Once I get some kind of ability to mount the indicator to the
gantry's Z
> > axis, I will do the measurements there. It is scary fast--300ipm
rapids
> > with CNC Pro on my 466MHz Celeron. I was unwilling to go faster,
and will
> > probably "keep" rapids to 100ipm. That machine will get a
Sherline head
> > assembly when I can afford it (i.e. the machines transition
from "hobby"
> to
> > "earning their keep" :-)
> >
> > (For Dee and company at Devitt, photos of my Mogliceing are at:
> >
> > http://photos.groups.yahoo.com/group/cad_cam_edm_dro under "Fun
with
> > Moglice")
> >
> > Best regards,
> >
> > Randy
> >
> > Randy Gordon-Gilmore ,----.___________ ______________
_________________
> > ProtoTrains // = = === == || == == == = || == ==
== = ==
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