The tranformer requirements for the EDM described are neither hard to find nor especially bulky. The resisters needed are also easy to get hold of from any...
I'm new to this group - ordered the book after seeing Rich's neat machine at Cabin Fever (thanks for taking the time to explain your nice mods to the leadscrew...
I went out and bought two nice 25VAC 150VA Transformers yesterday. The thought of 180V DC was too daunting. They cost $27 CDN each. I still think they're too...
Remember the power of your system is current * voltage. So the max power you can deliver is 25.6 volts * 0.15 amps = 3.84 watts, and it is limited by your...
I am working on a job to produce a plate for extrusion of material. The plate has a 5" diameter section with 1433 #44 drill size holes. Currently these holes...
Scott, EDM in that regard would be an even bigger PITA. You will be changing tiny electrodes constantly. CNC machining with the proper coolant and correct...
Yep. The way I've seen it done is a shallow metal box to hold the upper end of the electrodes, a master jig to position them then fill the box with a low-temp...
... Remember the power of your system is current * voltage. So the max power you can deliver is 25.6 volts * 0.15 amps = 3.84 watts, and it is limited by your...
This diet is making my insulin work so well I must be getting very light headed!!!! I don't know how I missed the "Two" and read 150VA as 150 milliamps. Must...
... I found a 48V 20.8 Amp transformer wound on a teriod at a local electronic scrap store. What value resister would you guys recommend with one of these?...
... Remember the power of your system is current * voltage. So the max power you can deliver is 25.6 volts * 0.15 amps = 3.84 watts, and it is limited by your...
Goldmine Electronic not only has the need DC gearhead motor but they also have photo flash caps (slightly less capacitance then what is used in the book but...
I'm finishing up my board and box and waiting for parts for the servo and dielectric tank. While I've been tinkering away, I've been thinking about the...
Reid, When i built my EDM i had used the Rustlick EDM 500 and it works great. The fluid will dis-color over time but will still porduce the arc all the same....
That's the reason someone unknown went to all that trouble to invent gloves! Almost all of these dielectric substances are toxic to some degree. If you dropped...
I have used several dielectrics in the home built EDM machines I have constructed. Below is a very rough draft version of the dielectric section for the up...
Thanks for the information. My main concern was the odor (if used in my basement), or the possibility of spilling dielectric oil on the floor, so it looks like...
Thanks for the info Ben I called the Hangsterfer (sp?)distributor in Milwaukee, and Crystal Brite costs 19.49 in one gallon quantites and a five gallon is...
Rich that is a good price, I paid close to $16 per gallon for five gallons. I think you will like it. There is no odor at all, just wipe off with a shop towel...
Hi, I have a 2-axis ball screw and linear bearing machine frame available. It would make a great platform on which to build an EDM with very professional...
I'm almost finished with the generator. My voltages for pins 2 and 7 on the servomotor socket (page 56) are a little high and nonlinear when the pot is turned....
Reid, You should have +12V on pin 3 (from U1). The action at servo driver chip 2 and 7 is correct. The LM339 is a comparitor. As you vary the input the voltage...
Rich, I have about +13.4V at pin 3. Is that high enough should I replace U1? My servo output ranges from just -.4 to +.4, but if I measure from either pin 3 or...
Reid, Whoa!!! DO NOT GROUND THE SERVO CHIP OUTPUTS!!!! If one happens to be high and you ground it, you will blow it. The reason the LED lites with one end...
I think I've already toasted U2. I found a mistake on the panel wiring to the pot & common side of the switches, and was careless in testing the LED by...
Reid, The meter is off, but no matter for this circuit. The U1 7812 is internally set to +12V +- .05 at worst. If the grounded pin U1-2 is not ground, the...
Rich, I checked my meter with a bench power supply set at 11.8V and it's dead-on. I replaced the 7812 and still have 13.4V which is strange. My generator...
... Where exactly are you applying the probes? Have you got the smoothing capacitor? I'm wondering if the input to the regulator is not as well smoothed as it...
The plans call for a 12v transformer which is then rectified and smoothed. This is regulated to provide power to the chips on board however the power to the...
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