Re: [CAD_CAM_EDM_DRO] new paradigm 6+3=9 bits: three S&D drives, 8 axes... , 3 bits spare

I'm guessing your roouter kit could be set up using four axis and still
leave pinout room for spindle on, etc?

Could it then be used for a milling machine instead and the axis switched as
desired via any method we want (I'd switch them using rotary gang switches.

Smoke

----- Original Message -----
From: "Doug Fortune" <pentam@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, September 21, 2001 3:03 PM
Subject: [CAD_CAM_EDM_DRO] new paradigm 6+3=9 bits: three S&D drives, 8
axes... , 3 bits spare


>
> In my upcoming professional CNC router kit, I am
> facing the problem of lots of auxiliary axes:
> multiple Z heads, dual/triple/quad Y axes,
> dual gantries, table raising/lowering etc etc.
>
> This severely constrains using the parallel port
> with its limit of 12 output bits (6 axes max),
> and one would desire to reserve some for
> spindle ON/OFF, vacuum ON/OFF etc.
>
> The new idea is to use and power only 3 drivers,
> each of which can be electronically 'hooked up'
> to any of 8 axes (lets assume bipolar only).
>
> In almost all cases, only 3 axes or fewer will
> be moving simultaneously. If you need to
> reposition an A,B or C axis, then assign
> driver #1 to A momentarily and change A,
> then switch back to #1 driving X.
>
> As there are S&D 3 drivers hooked up, thats
> 2*3 = 6 bits. Using 3 bits for 'assigning axes'
> that gives a choice of 2**3 = 8 axes. 6+3=9,
> so that leaves 3 output bits spare (for Spindle,
> vacuum, etc).
>
> Lets assume for the sake of argumentation, that
> if the 3bit assignment bits change, then
> the next (of the 3 available) "D"'s to flip
> get assigned to that driver now indicated by the
> new bit pattern. Flipping D's should not affect
> positioning adversely.
>
> - - -
>
> This circuit could also be useful to those
> guys who have a mill AND a lathe, but only
> want to buy 3 drivers. With everything hooked
> up, a software macro is called to activate
> either the lathe's motors or the mill's motors.
>
> Any comments from the electronics experts about
> the ease (difficulty) of creating this
> triple (4 wire for bipolar) 3*8 cross-switch?
>
> Doug Fortune
> http://www.cncKITS.com
>
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