Re: [CAD_CAM_EDM_DRO] home-brew CNC lathe

In a message dated 5/14/2003 4:20:27 PM Central Standard Time,
forumtvm@... writes:

> http://photos.groups.yahoo.com/group/cad_cam_edm_dro/lst?.dir=/Home-
> brew+CNC+lathe&.src=gr&.view=
>

I took the photos, and I admit, I am NOT a trained studio-portraitist! I am
not sure WHICH lead-screw you mean, the "X axis" or the "Z axis". So, I will
explain both:

Due to the bad "posing" of the photo with the dust-guard door closed, you
can't see the "Z-screw", but it leads from that handwheel on the far-right
into the headstock, where the "Z stepper" is face-mounted on the
inside-surface of the headstock's left face (1.5" thick 6061-T6).

The "X lead-screw" is directly fastened to the shaft of the motor on the
far-rear end of the saddle, and this is totally hidden by the tail-stock
body. However, you can JUST see the outline of the TOP of this motor in the
third snapshot in this group, right behind the left end of the tail-stock
body. That outline is the nearly-white, bright area, so intensely lit by the
working-lights above it.

BOTH are Superior Electric bipolar KML092F07 steppers, driven by a Slo-Syn
SS2000DP4 dual-driver-with-power-supply "box". Opto-isolator inputs. Works
fine, but VERY expensive. Were I to do this same machine again, I'd use
Gecko G210 drives and my OWN power-supply!

The lead-screws are 4 mm/rev. ACME with preloaded Turcite nuts by BSA.

Questions?

The little PCB drill in picture 1 of that group can drill a board so fast
that I can be DONE with all the holes faster than attempting it by hand, even
when I include the time to measure and "type-in" the X-Y coordinates!

Now, THAT uses surplus Size-23 motors and home-brew drivers made with a
now-difficult-to-find 29HGA41 (or whatever) IC once made by Sigma, later
G.I., but who knows, now! I haven't bought one in years. Long story!


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