On Tuesday 21 August 2007, Stuart Stevenson wrote:
>Gentlemen,
> We cheat. The edm uses through the spindle/tool flushing and
>dielectric oil. The electrode is a copper tube. The tube is not
>completely hollow. The tube has a web in the center of it. This allows
>it to remove the whole plug instead of leaving a core.
Unforch, Stuart, the micromill has no facilities to feed coolants through a
mounted bit. I'd assume also that your machines maker also supplies the
expendable electrode at a price. The brazing rod is ultra cheap at a tenner
for 30 feet of it in a plastic tube.
> You will have the same flushing problem with oil, water or air. I
>think you will probably get more agitation and flow with air. They all
>serve the same purpose. Use whatever you have and whatever works the
>best for you.
ATM I'm using 3/32 brazing rod, but the thought has crossed my mind that a
3/32 drill bit, with its flutes, might provide passage for flushing air if a
wd-40 nozzle tube could be aimed at the work/bit junction such that a blast
of air would be directed to the electrode face as a flute went by as it turns
a couple hundred rpms. Down one side and up the other. This will require a
re-mount of my current air blast as that's mounted on the head and this
should ideally be fairly fixed so it could maintain its aim. With my current
compressor, there will be a certain amount of water in the delivered air too,
and it doesn't seem to help a to drain the tank, 5 minutes later it has water
in the air again. I think its un-avoidable unless one is willing to purchase
and maintain a silica-gel dryer, which with the flow a day this would
require, would also need about a 4 hour bake cycle a day. PITA...
But the conversation about this is an ongoing idea exchange, thank you very
much, Stuart.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Fuch's Warning:
If you actually look like your passport photo, you aren't well
enough to travel.
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