Re: [CAD_CAM_EDM_DRO] Re: Servo hardware

timgoldstein wrote:

> Jon or anyone,
>
> Seems like a super solution, but over kill for a Sherline, Taig, A2Z Monster Mill sized machine. I would almost be afraid that a learning crash could do serious destruction.
>
>

No, these servos aren't that powerful, just that they reserve their
power for when it is needed. Also, due to the feedback, the computer
knows if the axis is lagging. I have a guy who uses a Taig with my
servos to cut wax patterns for casting cameos. He does a sheet of 9 of
them and it takes 24 hours of continuous milling. There are done from
both sides, and the two sides have to line up very accurately. He had a
stepper system before, and could not tolerate the occasional bindups and
other things that would ruin the production run.

> Also, I know with the time I have available and with where the market is moving, I would much prefer a solution that basically comes in a pre-built box and is ready to bolt on the motors and connect to the computer.
>
>

Yes, I agree about how desirable that would be. But, the problem is the
$10K ++ cost of the emissions and safety testing. I'd have to sell a
LOT of them to amortize that cost.

> I really like the idea of a full closed loop to the computer system and would probably have fun playing with EMC again.
>
> So, any options for maybe more appropriate powered brushed servos and matching drives that would work with your Universal PWM controller?
>

You can select the current limit with a resistor to limit motor torque
to whatever you think is safe. If Keling will import the smaller
brushless motors, that is another option. He lists a NEMA 17-size
motor, but I don't know if he stocks it. It only saves $6 to go with
the smaller motor.

Jon