On Mon, 01 Sep 2003 15:56:40 -0300, you wrote:
5) Another attempt at repairing threading for spindle/step/dir users. (Like
you , Steve.;) ). I have run several tests today on threading and more need
to be run, but I did find the reason for Steves X axis runaway and the
spindle slowing on threading commands. Hopefully its gone, but don't expect
miracles, this is an incredibly interactive code segment and relies on data
from several sources so this may take several attempts. My tests show no
problem and it SHOULD work.
Much, much better :) - Thanks Art!!
No spindle slowdown, no stepper lockups, no spurious X axis moves!
Still a delay initially while spin adder counts up, but the other
problems are fixed. I need to do some more tests and actually try some
threads now, which will be later today. I've a feeling from listening
that the Z axis response may be a bit slow and thread will suffer
without a decent lead in before tool actually starts cutting, and I
may have to keep tool return speeds same as cutting speeds, rather
than rapids to start next pass, but only an actual cut will tell. It's
so much better that I will risk a tool tip <G>.
I'm still tweaking tool offsets so they actually cut as expected, but
we now seem to be getting there. The home made "electronic tool
toucher offer" seems to work well and gives a good starting point for
the offsets. They then need tweaking slightly inwards on both axis so
the finished size is what you expected, but that's par for the course.
For those wondering what the tool toucher is, it's just a piece of
ground 10mm stock inserted into a piece of nylon and the lot held in
the chuck, fasten one multimeter lead to it, the other to tool holder
and slowly jog in until meter beeps on continuity setting. Much easier
than squinting down a loupe at the gap!
--
Steve Blackmore
