Re: Lathe controller about micrtokinetics

> THE MINUTE YOU USE A SERVO SYSTEM AND TRY TO THREAD THE CARD

GIVES UP. AT AROUND 1100RPM OF THE SPINDLE WITH A 1000PPR ENCODER
[WHICH IS NOT TOO MUCH OF RPM OR PPR CONSIDERING FEEDS AND SPEEDS
USED TODAY]INSTEAD OF PRODUCING A DECENT STEP SIGNAL WHICH WOULD BE
USED BY YOU FOR A STEPPER OR SERVO THE OUTPUT WAS GARBAGE WHEN
LOOKING AT IT ON A SCOPE.

>

BYRON - PLEASE STOP SHOUTING AT US!

Besides that, 1100 rpm is way too HIGH a spindle speed for most
single point threading. Especially if you are looking at hobby type
of applications and machines. They can't take it. The required feed
rates on the Z axis and the pullout required to thread at this speed
will most likely ruin your tool on any stepper system, even if you
DID get the encoder to work at 1100 RPM.

Why don't you try single point threading at about 100-200 rpm like it
is supposed to be done? Much of the time in a threading cycle is
used up with return, approach and depart moves, such that the little
difference in total machine time is relatively small compared to
running at 1100 rpm vs 200.

Best Regards,

Fred Smith
IMService