air ir s bad dielectric, it forces you to get much closer to the work before
the disharge occurs
use a 'parrafinic' like kerosene.
connect your air to a 'paint pot' full of kerosene and get a brass tube
you now have high pressure flush
rig up a holder to chick up one end and a hole in it to connect the tube at the
other
drill a cross hole to admit the pressureized fuild
connect the power to the tool with a jumper clip
(i doubt youre' achieving much current, so little heat )
work submerged, like 1" submerged `( dam or tank )
whatever cap you use it is best to have a longish (several mS ) non sparking
time
since you use a cap ( not a n osccillator ) you dont have independant on/off
so use what you have
aim for consistancy not speed
the speed you get with a consistant cut is the best speed
screwing with it for several days suggests you dont have any consistancy
commercial edm hole drill rotate fast to make the end wear even, else you get
pointy
and pointy is a hot spot
and a hot spot slows you down
commercial units use thru flush at > 800psi head
the end flow is low, but the swarf build up requires it ( lotsa flow)
if you dont get the swarf out, you're cutting swarf
use a spit shield because this can splatter a lot
alumatap is good smells nice but is darn expensive
kerosene is cheap
both are highly flammable, so submerge
( removes air, reduces fire potential until the fluid is hot enuf to ignite...
np for you)
capacitor discharge ( and lcr types ) are so old i have no data on them
old AGie STM STDM VF generators had such, but that was 1960
if you could guess from this rough idea from a transistorized system......
discharge time of 32uS longer just heats soft tool too much, cause
more wear not more removal
off time >400uS this is chip clearance edm is like a
bandsaw, on=tooth off=chip clearance
average discharge voltage 50V you'll have to sand back further than
the pros
supply voltage near 100V= the discharge will be near 30V= (seen on
scope), you need higher to 'start' the spark
with a single supply, use a
higher open/noload voltage
and 'lower your expectations' ;)
tomp
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