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John Frankl

Drum Forge Question

3 posts in this topic

Hello All,

 

I am heat treating longer blades in a Fogg drum forge and loving it. With a T-Rex burner, it holds temp +/- 5 degrees from 1600 down to tempering temps.

 

But I now have a blade considerably longer than the drum (about 122 cm). Now I have seen nice photos of Randall Graham "stroking," and video of Walter Sorrells doing the same, albeit in a longer forge. My question is this: I am going to have to do some stroking to heat the entire blade evenly. Can I keep the forge dialed to my austenitizing temp, or will I have to go hotter and just keep the blade moving faster?

 

Thanks,

 

John

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Yeah, stroking works best with a short but intense fire, just gotta keep movin. I find it works best if you go up in stages, I take the blade to a nice sub-critical red and get it all nice and even there first, then add gas a bit at a time till the edge shows the flare, or just starts to become non-mag, then hold the fire there and wait to see if the rest of the blade comes up... if it doesn't I add just tiny amounts of gas till it does.

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