Re: [CAD_CAM_EDM_DRO] Need 1N4437 bridge rectifier...

Doug,
Can't help you with a source, BUT; was the original a "selenium" unit? If
so, the voltage drop was much greater than that of silicon diodes. At this
point, don't remember exactly what it was.

Now having said that, what you might do is to figure out the current and
then put a power resistor in series with the brake to get the voltage back
to 90v. Remembering that E=IR and you want a 20V drop, you should be able
to use an amp meter to figure out the current you have now and find a
resistor that is close to the correct value. Also remember to figure the
power requirement so you don't burn up the resistor.

Just a thought.

Art
At 11:09 PM 9/12/00 -0000, you wrote:

>Group,
>
>Anyone know a source for this item? Mounts with a 1/4" bolt on the
>back. Metal case. At 110V ac input, ouput is 90V dc. Probably
>about 10 amp rating.
>
>Apparently this was widely used 20-30 years ago. My local sources
>don't even show the number in their listings.
>
>It's for the high/low clutch mechanism in a Hardinge DSMA.
>
>Lacking the exact part number I replaced it with one of those plastic
>cased rectifiers with 30A rating. Output is around 110V dc. Seems
>like the clutch actuating coils are running a little hot, although I
>can't say for sure since I never checked them until now.
>
>Anyway, it'd be nice to get the exact replacement part.
>
>Thanks,
>
>Doug

OLDER THAN DIRT

Country Bubba

(Actually the inventor of Country and Bubba)

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