Re: [CAD_CAM_EDM_DRO] Doesnt ANYONE have this drawn up??? was: John's CNC plans???

I agree with you. No matter how old and beat-up it looked I thought I could
replace it.. Well, in the end the old part is back on there and still works
fine.. :)
I was successful at creating my own Brass ACME Nut when I first got my old
mill. Every place I contacted told me that I could only buy it and the
leadscrew as a matched pair and that would cost me around $1200 per axis..
Sheesh!
Then, about 6 months later I found the Cad_Cam* list. I was ok with the
0.005" resolution that I was getting on my mill with all its old'ness and
manual compensation for the semi-loose ACME. Someone told me on the list
that it was in McMaster/Carr! ha! Oh well... Live and learn...
But now with CNC and Ballscrews?? Hmmm... I wonder...
For me Jon, its very much a sizable learning curve. Sort of getting the
"Online" Apprentisship <--- Bad spelling ) training...

Vince

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, August 14, 2003 10:08 AM
Subject: Re: [CAD_CAM_EDM_DRO] Doesnt ANYONE have this drawn up??? was:
John's CNC plans???


>
>
> Vince Negrete wrote:
>
> >Jon, you've very much enlightened me on using the existing screw
dimensions.
> >Stupid me... I never thought of that! very cool!
> >
> >
> All this stuff is hard to make. Some things, like the shape of the end
> bracket, and
> the J head on a Bridgeport, are free-form, hand-made surfaces ground into
> mold patterns 50 years ago. I tried to measure many of these parts with
> granite surface plates, angle plates, vernier height gauges, etc. and
> still came
> out way off, so holes had to be drilled out, shims inserted, all that
messy
> stuff. So, any way you can continue to use the parts that ALREADY fit
> fine has got to be OK. I made my own yoke (the block in the center of the
> saddle that holds the leadscrews) because I thought the Bridgport part was
> flimsy. Well, it was a big mistake, and I had a HELL of a time aligning
> things so the screws ran straight, etc. A number of ballscrew retrofits
> make cylindrical adaptors that either fit the nut right inside where the
> original bronze nuts went (that would require an undersized screw) or
> the nut sits just outside the yoke on the end of the cylinder. I now
> realize why they do that - to preserve the factory alignment of the screws
> and nuts.
>
> Just a rambling comment on some of the pitfalls I ran into when doing my
> own retrofit.
>
> Jon
>
>
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