On 8/13/2012 3:43 AM, Clive wrote:
> Well done on the electrolysis. I've been using it for quite a few years with brilliant results - IIRC I saw the instructions on Instructables.
Been on my 2do list for a long time. Since I got a sand blast cabinet
and glass bead, have not had a real need for it.
The supply goes from 0-30V up to 15 amps or more. So I should be able to
do something fairly big.
Would have been nice for my old 109 lathe. The old 4-jaw chuck was a bit
rusty. A few minutes bead blasting and looked like new. Then spent a
long time getting the beads out of the threads :(
Bead blasting is great as it does not remove material (or very little.)
Great on aluminum as it shatters the brittle oxide layer then bounces
off the bare metal.
>
> I use an ATX computer power supply to power mine. If you short the green wire in the motherboard plug to any black wire with a paperclip, the power supply thinks it's connected to a motherboard and will happily deliver 5 and 12 volts from the Molex hard disk connectors at pretty high amperages.
>
> I've heard dire warnings against this but have never had any problems over a period of years . . .
The issue is the power supply may shut down.
I built a router in a 1U case. An old PIII. It had no hard disk, just a
compact flash drive. So it did not use much +5V or +12V. It had a nasty
habit of shutting down. I had to add a dummy load to the +5V, then it
was better. Still did it once in a while. Ended up sticking and old CD
drive as another dummy load ;) Supply died and could not find a
replacement under 200W so had to go to another case (old supply had near
0 airflow).
What happens is the several voltages may not be independently regulated,
just different windings of the core. If one supply is loaded and the
other is not; the unloaded supply may reach over-voltage and the supply
will shut down.
Or the opposite will happen. The unloaded supply is the one that is
regulated and the used one may not provide much power.
Some supplies may have a crowbar to protect from over-voltage. That
could be tripped also (and cheap supplies may just die when this happens.)
I had an old AT supply that I cut the DC power leads and connected them
to a barrier strip. Made a nice bench supply. I used to call it my "Tube
supply" as it glowed like an old tube amp. That's because I had an auto
tail light inside on the +5V to keep the supply stable giving a dim
orange glow ;)
--
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Scott G. Henion
Craftsman 12x36 lathe:
http://shdesigns.org/Craftsman12x36
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