Re: Converting Computer Power Supply to Variable Supply

Marc,

Even though a "bucker" will certianly work.. IMHO a good ole Variac and some
diodes from hell are they way to go... I have an old computer tape drive
spindle motor mounted on my BP.. Some people think it's rated at 60VDC, some
think 90VDC (seriously I've see EXACTLY the same motor rated at both , I
mean same fricken part number)... I have it on a Varaic.. FWIW one of the
neat things about these old computer tape drive motors is that hey were
meant for continious hard duty and were meant to be air cooled (they used
the output of the vaccume system for the tape drive to blow into the
motor)... and yeah I managed to get the first stage vaccume assy (basiccaly
just a fan in a shroud) from the tape drive and I air cool it... I plow away
on the BP all day doing SERIOUS metal removal and the motor is cool as a
cucumber...

Checkout this url for some pictures of the Variac and Diodes from hell.. :-)
http://www.ggls.org/DCPower/
and although it shows an import lathe (my OLD lathe) I have 3 of these
motors and ..duh .. stuck one on the BP...
You'll also see a smaller version that I used to power a gearmotor as a
power feed on my old import mill/drill..... and yeah these are kinda old..
since I now have a BP and a Clausing :-)....

--.- Dave




<marc.britten@xxxxxxxxx> wrote in message
news:1177622858.141944.165230@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Apr 26, 12:10 pm, Don Foreman <dfore...@xxxxxxxxxxxxxxxxxxxx>
wrote:

Depending on current and voltage, a "buck converter" is only slightly
more complex and has the property of magnifying current to the extent
that load voltage is less than supply voltage. It acts essentially
like a variable DC transformer. The trick there would be finding (or
making) an inductor that can hack the load current without saturating.

Don, THANKS! I know there was something out there that worked like
this, just couldn't remember the term.

I need a power supply for that old 60Volt motor I posted about and
can't find a good 60ish volt transformer to work with.



.

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