Re: Phase stepping implemented, not tested on hardware

["Matt Shaver" <mshaver-at-erols.com>]

> My first thought was that with one bit we might be refering to the
> purchase of the cabin on Walden Pond for 12.5 cents.

I thought HDT had about $20 in that cabin, garden, etc. ? The book's out in
the shop, I'll check tomorrow ;)
 
> My second thought is that somehow these bits can be translated into
> signals, that when amplified and fed directly to the windings of a
> stepper motor, cause it to turn.  If this is true, how would you set up
> such a circuit.  
> 
> I think I'd be happy to be a "brave tester."  I've already got the smoke
> hood in place above the bench.

This "phase stepping" thing is specific to old Bridgeports that use this bit
pattern rather than the more conventional step and direction type signals.
Brendan Doherty in Ireland has retrofitted his old Bridgeport with the EMC
using a little circuit that I drew up for him a while back. He added an L297
to convert step and direction to this bit pattern. Fred has built it into the
software and Terry Ridder from Chicago is going to try it out on a couple of
machines there.

Matt