Re: [CAD_CAM_EDM_DRO] Mogliced Sherline backlash report

Hi, just took a look at pictures. Nice work! cul brian f.

----- Original Message -----
From: "Randy Gordon-Gilmore" <zephyrus@...>
To: <sherline@yahoogroups.com>
Cc: <cad_cam_edm_dro@yahoogroups.com>; <devittmach@...>
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 ,----.___________ ______________ _________________
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