Re: [CAD_CAM_EDM_DRO] DRO for mini-mill

On Fri, 27 Jun 2003 19:48:50 -0000, you wrote:

>Hello all, this is my first post to this group. I have a mini-mill
>(similar to Grizly etc but with 10tpi leadscrews on all three axis)
>and want to get DRO for it. I'm going nuts using just the little
>scales on the handcranks. I see there are inexpensive scales to use
>for this purpose that can be either used stand alone or with a DRO
>box. What I haven't figured out is what part of the scale gets
>attached to what part of the mill for each axis. The vertical axis is
>easy, its the X and Y I haven't quite got figured out yet. I'd
>appreciate any hints how to get these hooked up.

I've got a similar setup. Please check www.netcom.com/~madyn and go
to metalworking. I've got the pictures of the X and Z axis up there.
The Y is similar to the X axis and on the left hand side. I used two
simple angle brackets.

>
>Then there is the issue of the DRO box. I saw a mention here of DRO2
>which seems good for the task except its only 2 axis, I want three (I
>could do it with 2 DRO2s but thats getting a little expensive)

I've got one in design, but I am not going to be able to get to it for
a while.

>
>I'm an electronics engineer, doing any PIC based boxes and stuff is
>easy if anybody has any plans for this sort of thing.

Looks like you need 2 LM 339 sections for each caliper, data and
clock, and perhaps a few relays to set modes. I think that an 8751
style processor will do just fine, there's an ATMEL version that will
do the job and is beefed up over the original. Don't have plans for
this yet.

>
>Home machining is a resent endeavour, primarily to support one of my
>other hobbies, telescope making.

I know about that one, too... at least, some of the accessories.

>
>I eventually want to get this converted to full CNC use, but for now
>I'll settle for getting DRO working.

Later this summer for me, the DRO readouts, that is.

Harvey

>
>Thanks,
>
>John S.
>
>
>
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