Re: [CAD_CAM_EDM_DRO] On LED's and Gecko Tunings

AbbyKatt wrote:

>Two quick, and perhaps silly questions:
>
>Will a 6K resistor be enough with my 50-60V power supply, to light an
>LED and not fry it?
>I'd like to have a neat light telling me if my power-supply is on, and
>the old external HD case I'm using already has one built in... So..
>
>R=V/I
>R=(60/0.01)=6K?
>
>Goodmath? Wrongmath?
>

Yes, good. But, it will dissipate .6 W, so you should use a 1 W
resistor, minimum.
Or, use 2 1/2W 3000 Ohm resistors in series.

>
>.. And.. Which is better, tuning gecko-drives with the motor attached,
>or not attached to the leadscrew (ie. Bench or field?) I mean, attached
>it might break something if it starts violently oscillating, but then,
>wouldn't it be better if you adjusted it when it was actually moving the
>table? Or is a combo of both best? Your experience, please!
>
>

You really need to tune it with the entire load attached (screw, nut,
table, etc.)
Have an e-stop circuit hooked up so you can shut it off if it oscillates.

Jon