Re: [CAD_CAM_EDM_DRO] Re: Re: Re: GeckoDrives.. Can anyone Help?

>
>From: Jon Elson <jmelson@...>
><s>
>So, steppers are totally not interchangeable with servo motors of any
>type, and totally different drivers are needed for the two. There are
>some servo drives that can accomodate several types of servo motors,
>others will drive only one type.
><bigs>
>
>Jon is speaking about the electronic packages needed to drive the
>different motors. But there are other considerations where they are
>"totally not interchangeable." Velocity control is one additional
>difference. For this issue I'd include the step and direction servos with
>the steppers.
>
>Velocity control says, go to this position at this rate. Steppers and
>step and direction servos, have no equivalent command. The difference

>not be important for hobby uses, but I've seen operators in the shop
>need to put a 0.0015 taper on a 10" shaft. Using velocity commands, the
>result is a nice smooth cone. Using step and direction, the result is a
>set of steps with cylinders between. You might not think that you can see

>difference of 0.0015 but you could see it's reflection by rocking the parts
>under a good lamp. You will also see the diference near the quadrants
>when milling large circles.
>
>Hope this muddies the waters, but not to much.
>
>Ray
>
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