Re: [CAD_CAM_EDM_DRO] Re: Is it possible to change the BP motor to eliminate shifting?

Jeff Goldberg wrote:

>Maybe this is heresy, but how about a small stepper or servo motor
>controlling the Varispeed crank. It's kinda hokey, but no fancy spindle
>electronics involved and you get maximum torque at the low end. Also, you
>don't have to change a whole lot of your setup to get there.
>
>Just a thought,
>jeff
>
>

I had thought about this as well. There are issues with the controller
though - you have to be sure that the crank is only turned when the
spindle is running, for instance.

Another option is to use a DC motor and drive, like this guy did:
http://truetex.com/dcdrv.htm

You get full torque at all speeds, so that's not a problem. You don;t
get "extra" torque on the low end though, so it may still me a good idea
to have changeable gearing.

I'm definitely curious about answers to this question as well.
- Steve