Hi Curt,
Thanks for the info, just a couple of points
--- curt_rxr <
cwrxr@...> wrote:
>It's the circuit used in the Garden of EDM -- I'll be
>glad to e mail a
>PDF of the original NASA Tech brief to you if you
>like.
If it is just the Garden of EDM, don't bother to send
at the moment, I have used bits of that but modded to
IPS etc.
>> My early experiments included a solenoid armature
>> oscillating an electrode at 50 Hz, amplitude about
>> 1mm. This worked very well since the spark always
>> initiated at the dielectric breakdown point.
>>However,
>> at the moment I can see no way of integrating the
>> electrode feed with the solenoid arrangement. If I
>> could it would answer a lot of problems.
>There are two ways to implement the servo. One is to
>use a stepper to
>control the pinch roller whichs feeds the brass wire
>through the guide
>the other is to use a worm drive and dc motor.
>Your vibrating electrode is the same approach Ben
>Flemming used in his
>Ramah Tap Burner design and should work well for PCBs
>which are
>∗FLAT∗. It would simplify the overall design a ton.
>Well Done!!
∗BINGO∗ I have just found an ultra simple way of
integrating the electrode pinch feed with the
vibrating electrode, (without vibrating the pinch feed
mechanism). I will proto this w/e, and if it works,
I'll post a sketch.
BTW, do you have any info on the approx. erosion rate
of your 0.001 electrode. Does your electrode feed run
slowly or relatively fast? Just asking so I can
determine whether to use stepper or dc servo drive
motor.
>Yep!! And if you incorperate a drill head on the
>back of your gantry
>you'll be able to drill the boards in water and save
>on dust collection.
Yes, I intend to. why reload twice.
If this vibrating electrode approach is succesful,
there is no reason why 2 (or more) electrode modules,
(spaced on the X or Y axis), could not be driven
simultaneously to produce two boards of the same
design.
For those interested, the vibrating electrode is
driven by the solenoid arrangement in an aquarium
aeration pump. Simple, cheap and very effective.
However, production item may have to be a lighter
design to increase the oscillation frequency.
Curt, many thanks for your help
Roger
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