Re: [CAD_CAM_EDM_DRO] Re: 20 Amp 80 V $99 DC Servodrive

Mariss Freimanis wrote:

.....

> I am not familiar with the Kerr
> drive; it may have been slow because of low power, small motor or a
> high encoder line-count requiring step frequencies beyond the ability
> of the computer. We will shortly have out a "X10" step pulse
> multiplier version of our microstep drive. The same circuit can be
> used in the G320. What is exciting is if a 1000 line encoder is used
> with the "times 10" pulse multiplier, the servomotor would look just
> like a half-step driven step motor. All speeds and distances would be
> identical. Otherwise it would be like a 20 microstep drive.

Thanks for the answers so far, Im learing a lot.

OK, I think I see the problem.
If I had a 1000 line encoder on the motor, and a 3:1 pulley ratio to the
screw, I would need 3000 steps per rotation, or 30,000 steps per inch
given 10tpi screw. So my software would have to generate 30,000
steps/in, vs the 2,000 steps per rev for a 200 step stepper motor direct
coupled to the shaft. This might be byond the speed a PC running windows
could do. Your pulse multiplier of X10 would take each incoming pulse
and generate 10 pulses, so the software would only have to do 3,000
steps per inch.

Just curious, how do you do X10 scaling and keep the space between
pulses uniform?

In my stepper stuff ramp up and down is very important, is that equally
true with a servo operated in step/dir mode? I assume your servo module
does not know anything about ramp up and down? Could I just throw the
right number of step pulses out, at my max desired rate, and expect the
motor to follow- assuming of course I have a motor large enough to do
the job. Wouldnt this tend to overshoot at the end?

Your introductory offer of $99 sounds very good to me, but if I get
hooked on these what will the produciton versions cost?

Thanks again for all the answers.
ron