--- In Electronics_101@..., "duncanbojangles"
<duncanbojangles@c...> wrote:
This is exactly what I was looking for. Now, I can get my
Homemade CNC machine to work using a parallel port interface.
Now I'm even more puzzled. Why do you want your positioner to
execute 4 steps with each command? By the way, using some latches,
you could get the PC to control the steppers directly. This would
eliminate the counter, decoder and NAND gates. Also, using this
method you could implement "normal mode" stepping where you have two
windings energized at a time. (You could also do half-stepping if
you wanted.) This mode results in more torque than the wave mode
(one winding energized at a time) that you have now.
The energization table for normal mode is:
1 1 0 0
0 1 1 0
0 0 1 1
1 0 0 1
Wave mode is:
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
Is your CNC machine for metalworking? I do a bit of that myself.
Recently, I built a controller for a dividing head, using a stepper
motor, so that I can do automated indexing. Here's a link to a page
describing the prototype:
Don
