Re: [CAD_CAM_EDM_DRO] Re: A MaxNc Retrofit on my Dyna-Myte 2000 CNC mill

Fred,
I looked at the board layout and read the
description. From what I gather they are using the S5
input for the Positive limit switches and S6 input for
the negative limit switches. What you need to find out
is what is your program is looking for. I attached a
file with the pin outs of a printer port and a
schematic of what I think they may be asking for. I
have no experience with cnc but tons with electronics.
You may want to wait before using the schematic until
some opinions have been expressed.
Mike


--- caudlet <thom@...> wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Fred Howe"
> <fredhh47@...> wrote:
> >
> > I am retrofitting a dead Dyna-Myte 23000 CNC
> tabletop mill with a
> > MaxNc controller board and software kit that I
> purchased for about
> > $250.00 a few years ago. My problem is the
> limit/home switch wiring. I
> > simply can't make heads or tails out of the single
> paragraph of
> > instructions about how to hook them up. What I
> have is two loops,
> > consisting of the 3 positive limit switches and
> the 3 negative limit
> > switches, set up so that if any switch is tripped,
> it opens the
> > circuit. I am hoping to use the same positive
> limit switches as the
> > Home switches by putting a switch in the line and
> directing the output
> > to either the "Home" pin or the "limit" pin, as it
> appears that it
> > won't work to simply connect the switches to both
> at the same time.
> > What mystifies me is where do I connect the
> "other" end of the loop?
> > Ground? Someone suggested I had to supply a low
> level (<50ma) 5 volt
> > source. Does this make sense? I have listed the
> location of pictures
> > of the circuit board, the circuit schematic and
> the very short
> > paragraph describing the hookup. If anyone can
> offer any insight on
> > this problem I could complete my project. BTW, I
> know the MaxNc board
> > is a cheap, cheesy substitute for a real
> controller, but I'd like to
> > complete this project before I start trying to
> improve on it. Thanks
> > for any help
> > Fred Howe
> > pictures are at:
>
> Fred I am not familiar with the specific controller
> you have but from
> an electronics perspecitve you can't have switches
> in a series
> configuration (typically normally closed) AND an
> individual
> configuration for homing. The Home signals have to
> be for each axis.
> Each axis as a separate Home switch. In some
> software you can
> designate the Homes as Limits too but they can't be
> in series
>
> You can connect all of your limits (sometimes called
> "hard limits" and
> far limits in series and use the NC (normally
> closed) so that any trip
> will open the circuit and trigger an e-stop. The
> Homes need to be
> separate swtiches, one for each axis. Homes can be
> NO (normallyu
> open) or NC depending on how you setup the software
> logic.
>
>
> Not trying to rag on you but for 57.00 bucks for our
> powered hreakout
> and MACH3 (Mach as a MaxNC mode) you might have all
> the features you want
>
> Tom Caudle
> Http://www.CandCNC.com
> "We just made CNC easier!"
>
> Hardware for Home Shop CNC:
> Low cost, powered/isolated, breakout card
> AC and DC "Drive Saver" power controls
> 2nd Generation digital THC
> Handheld Manual Pulse Generator (MPG)
>
>
>
> > www.professorwiz.com/fred/circuit1bd.jpg
> > www.professorwiz.com/fred/circuit1dwg.jpg
> > www.professorwiz.com/fred/description.jpg
> > or e-mail me and I will e-mail them to you.
> >
>
>
>
>
>
>
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