Re: Re: one axis closed loop control

Mark

I'd vote for the servo/gecko3x0 option. With a stepper the faster you turn,
the less torque you get. With a spindle the faster you go the more torque
you need.

Ray

>    From: "markotime" <mfraser@...>
>
> I'm facing the same challenge with an emco lathe that I'm retrofitting
> with "generic" stuff.  Rather than indexing, I'm putting a
> step/direction control on the spindle.  May be a big stepper with
> a Dan Mauch 5-amp driver, or a servo with a Gecko320.  Drive it
> as an axis under cnc (CNCPro from Yeager in my case) when doing
> threading, fusee-making, fluting, or by a 555-based pulse generator
> when running at constant speed.
>
> That's *my* way around changing software...
> There are some nifty looking rotary encoders on ebay, for 7 bucks
> (800 line, use a toothed belt) /mark