Re: [CAD_CAM_EDM_DRO] Another EDM Approach

hi
can u sed me circuit diagram with 556 and 2 risisters and 2 capaciters??

shabbir

At 05:34 AM 7/30/01 +0000, you wrote:

>vrsculptor@... wrote:
>
>> Just musing, I'm out of my depth here....
>>
>> I'm also interested in EDM. I had concluded, before the recent posts,
>> that useable home EDM was not feasible. Seeing the recent posts I'm
>> not so sure. How about simplifying the proposed circuitry by
>> offloading most of the control to a PC.
>
>HUH? The pulse on time that someone suggested was 1 - 9 uS.
>There's no way you can control pulses that short with the PC parallel
>port.
>
>> The parallel port already
>> controls my Z axis using a step and direction pin. Could the third
>> pin be tied to a one shot circuit to fire the pulse?
>
>The pulser circuit doesn't "fire" the pulse, the EDM action in the small
>space between the electrode and the workpiece does the 'firing", and
>the pulse control interrupts the discharge, and prevents another one
>from starting for a controlled time. This kind of circuit can be built
>with a dual timer chip, the LM556, and 2 resistors and 2 capacitors.
>
>> A trim pot with
>> knob on the one shot circuit could manually control the pulse length.
>> Determining optimal operation (no spark, just right, short) seems
>> like a much harder task. It could be done if the EDM interface board
>> could post the operational status using some of the remaining
>> parallel port pins. The software to drive such an arrangement would
>> be trivial.
>
>But, WAAY too slow. Letting the PC control electrode advance (or
>other axis movements) and figuring out when to stop is fine, but the
>pulse control is just a bit too 'real time' for the parallel port.
>
>Jon
>
>
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