Re: [CAD_CAM_EDM_DRO] Re: Commercial EDM capacitance ranges

Fantastic idea! You can always wire them in series for less capacitance and
parallel for more. When they
are plentiful and free, it's just an ESR ( effective series resistance )and
physical size issue of how many you can
cram in a box! The ESR rating would be something to watch out for.
Photoflash caps might not have that great
of a rating as they aren't designed to charge and discharge at quite the
rate an EDM would. They might get too
hot in that application. When caps get too hot they like to vent (
literally ) and blow fuzz all over the room.

later,
Larry Edington

----- Original Message -----
From: <wanliker@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, February 10, 2003 4:04 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Commercial EDM capacitance ranges


> One cheap source of High Voltage, High Capacity, capacitors for a Homemade
> EDM, are the used disposable cameras, they can usually be had for the
asking.
> Last time I asked a Walgreens for them, I got over 100 within a week, had
to
> ask them to stop saving them.
> The ones I tore apart had a 330 volt, 160 MFD capacitor in them, and these
> capacitors are rated for Photo-Flash usage, and this means a very high
> discharge rate, as when a flash goes off, it is almost a direct short.
> Parallel as many as you need to get your needed capacity, or using them
> switched in to control your discharge, but be sure switches can handle the
> high discharge rate.
> bill
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