Re: DRO

Art,

I am starting to build a DRO for my mill--have bought motors
and encoders from Goldmine, and am planning the setup. I'm
curious how your wire loop worked out, --what path did you
use, and what kind of wire. I remember reading that Steve
was worried about slippage. Have you experienced any, and
how have you prevented it?

Intuitively, I'd think a steel wire on a very small steel
shaft could slip very easily.

--Joe Landau

"A. G. Eckstein" wrote:

>
> From: "A. G. Eckstein" <axtein@...>
>
> Rudy,
> With the help of this list, I am in the process of building a 3 axis DRO
> for my mill/drill.
>
> At Goldmine, http://www.goldmine-elec.com/, I found some 24 volt motors
> with 1000 line encoders attached ($3.95 each). Be carefull of their specs
> as the shafts are 5mm not 3/16" as advertised. Also found some 5mm ID
> bearings ($1.49 each)at the same place. Then on the metalworking
> newsgroup, found a notice that Steve Lindsey was making his DRO software
> available for the download and it works quite well on an old 486 DX 100
> that I had laying around. While it should work in a DOS window, I find that
> it does not on this machine. Then with a few pieces of Al that I have
> laying around, I have had an enjoyable experience making chips on my Mill.
>
> The biggest difference between what I have seen in the metalworking drop
> box (and in the material with Steve's program) is that instead of using a
> single line to rotate the encoder, I put the encoder in a block on one end
> of the table and then have another axle in a block on the other end and
> make a loop out of the wire with it fastened on one side in the center of
> the table.
>
> If you need additional details, please let me know, and will send something
> to you off list as I have some drawings in cad. They are always evolving as
> I find ways (in my own mind) to improve the workings. At this point, I have
> two axis up and working and the resolution is 1.8 tenths per line on the
> encoder. Have a couple of ideas and may(?) be able to get that down to .1
> tenth with very little work. Hope to do that this weekend when I finish the
> blocks for the Z axis and hope to give it a try.
>
> Art
>
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--
----------------------------------------------------------
Joe Landau jrl@...
VersaForm Systems Corp. (408) 370 2662
591 W. Hamilton Ave., # 201 Campbell, CA 95008
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