On Sun, May 11, 2008 at 5:35 AM, Ray Henry <[EMAIL PROTECTED]> wrote:
>
> Hi Gary
>
> The limits are at the end of travel. As are the home switches. On most
> commercial machines like this there are 2-3 or 4 switches on each end of
> travel. What we do is home to the switches at one end and then offset
> to the center of the table. This offset is set in the ini file as a
> distance from the actual switch and index pulse to where the integrator
> wants home to be. It is seen by everything in the control as the real
> home. So even if you command a g53 x0y0z0 it will find the center of
> the table rather than the switches.
>
That makes good sense. Thanks!
-g
> HTH
>
> Rayh
>
>
> On Sun, 2008-05-11 at 03:12 -0700, Gary Fixler wrote:
> > On Sat, May 10, 2008 at 7:53 AM, Dave Engvall <[EMAIL PROTECTED]>
> > wrote:
> >
> > > The Mazak at Galesburg offsets (X and Y) to middle of table.
> >
> > I thought limit switches needed to be at extents, because you can't
> > run right through them. How do they have it set up? It would work with
> > an optical trip - something I've kind of wanted to set up with
> > something like this:
> >
> > http://www.robotobjects.com/scripts/prodView.asp?idproduct=407
> >
> >
> > I've seen used Boeing machines with a 1" aluminum plate
> > drilled and
> > tapped in a 2" or 50 mm grid.
> > Lots of flexibility for mounting.
> >
> > I recently made a tiny one of these for my mini mill, and confirm that
> > they're awesome:
> >
> > http://www.flickr.com/photos/garyfixler/sets/72157604574121304/
> >
> > They're pretty easy to code for with nested O-code while loops, and
> > either a drilling, or helical boring routine. I used the latter, with
> > my own helical sub, which I later learned is nearly identical to the
> > one included in EMC's examples files :)
> >
> >
> > For 90% of what I do I use UL of my vise as G59.3 and clamp
> > fixtures
> > in the vise. I simply draw my parts with a 0,0 UL corner.
> >
> > I like this idea, especially as it's easy to square the mill back up
> > with my table. How do you account for the horizontal position in the
> > vise? Do your fixtures butt up against one side of it for
> > repeatability across the jaws? I think I'm going to steal this
> > concept.
> >
> >
> > I keep thinking about making a tool length gage mounted on the
> > table
> > with a piston and a prox switch. It should be a very fast and
> > accurate way of setting length. So far the round-to-it has
> > eluded me.
> >
> > I think this doesn't even have to be mounted. It could simply be a
> > little device you place on the table whenever needed, though it
> > wouldn't be quite as fast as a prox switch. I just found this while
> > poking around the net:
> >
> >
> http://www.industrialhobbies.com/howto/production_notes/height_gauge/height_gauge_pt1.htm
> >
> > I'll just need a parallel block, a height gauge, a little block for
> > the gauge tip, and some epoxy.
> >
> >
> > -g
>
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