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Trade point success??

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madcrow:
I have got 5 gallons of old motor oil, it will work too.  The bigger teh project, the more likely it will flame up.

Auggie:
Learned that one the hard way my self.

Titan_Bow:
So if I use old circular saw blades, is it a necessary step to heat them to take out the temper?   What are the drawbacks if you bypass this step?  If it is absolutely necessary, what equipment do you use to heat to 1500 degrees?  Would a handheld torchfrom the local hardware store be sufficient?

Thanks,
Titan_Bow

madcrow:
Most of the blades are too hard to bore through.  I have ruined some expensive bits trying it.  You have to remove the temper in order to do that.  You can use a small map torch to remove the temper.  To heat treat, I lay them on one of the large burners on the kitchen stove and turn it on high.  The burner is not hot enough by itself, so I use the torch while they are on the burner to get them red.  Once they turn red, I touch a magnet to them.  If the magnet sticks, they are not ready, but if it does not stick, I know that i have the temperature around 1500.  I try to hold the temp for about a minute to ensure an even heat treat.  Then I quench in regular cooking oil that is about 135 degrees for 1 minutes, wipe them down and throw them in the oven on a cookie sheet at 500 - 550 for one hour.  Oh yeah, cover the cookie sheet with aluminum foil before you start so you don't leave arrowhead shaped spots on it.

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