Early Miller Dynasty 200 dx

Cyclotronguy · Dec 10, 2020

I have an early Miller inverter machine that has been wonderful. It lives in a clean environment and in terms of arc time, very low hours. That said thousands of HF starts (GTAW tacks on thin sheet steel and thin wall tubing). I need to dress the points on the start circuit (yes it has points) I am not finding any spec for the gap.

I'm guessing 0.010" - 0.011" (0.2mm - 0.3mm) but I'd rather not guess. Anyone know the factory spec?

turnworks · Dec 10, 2020

Can't answer that question but is there a chance you can take a different route and bump the start amps?

Crank the start amps to 15 for 90ms while keeping the min amps at 1-2. Just a little bump on the pedal will give a nice pop to get the arc going consistantly. The settings are under the nonsecret secret menu on the DX models.

teemfan93 · Dec 10, 2020

Not sure if this helps, but I've heard people recommend sticking a piece of paper between the points during a HF start to clean them.

Cyclotronguy · Dec 14, 2020

Thanks "turnworks" for the suggestions: it's like having a new / better machine.

eKretz · Dec 15, 2020

Good tip. I've got an early 200DX also. I'll keep that in mind.

Cyclotronguy · Dec 16, 2020

BTW

I did not clean or re-gap the points, no changes other than what "turnworks" suggested. The 200Dx went from 5 failed fires for every good one to 100% crisp clean starts running 3/32 tungsten clean grind and a small flat on the tip.

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