Miller high frequency arc start

Thanks, Tim.

I had more time in that pedal than I care to admit. It was a bit of an engineering nightmare. Adjusting the spur on the rack so it didn't bottom out, but had minimal lash, adjusting the tangs on the roller microswitches to engage sequentially. The arm on top of the L linkage has a slotted hole to allow the pedal to come down before engaging the rack/spur, so it connects to the machine/ switches off max display and goes to low end display and engages the 2nd micro roller switch to start the arc on the very bottom of the amp range.

Because the torsion spring that lifts the pedal would pull that slotted link to its other end of the slot, it won't keep the rack/spur position as you start to lift up on the pedal to lower amps as you pulse. It would slack with that slotted hole, right as you went from down to up, so I had to put a second spring on the L linkage to keep tension between the pedal and the L link, so when you lift up on the pedal it didn't hesitate amp change and it didn't shut the arc switch off at the low end, prematurely.

I barely kept myself from pitching the idea out the window and caving to ebay.

The torch trigger is good for awkward tac weld positions, but because it gives max amps all the time, you can't feather back out of it and the weld puddle craters, because it cools before the arc lowers enough to relieve it. Its like throwing a rock into a pool of water and watching it freeze before the water calms. The pedal is critical.