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Heat treating by radiation

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simk:
Thank you scp! Hoping for more details incl. pics soon! I did also google these silicon heating blankets some time ago; they aren't too cheap, are they? Cheers

Beba:
Willie, those heaters are simple cal-rod heaters. Same as the cooking rings on the top of an electric stove. They will not handle much of a bend before breaking the internal element. They are designed for primarily for conductive (in contact) heat. Used solely in a convection application they will burn out quickly.

Using radiant heat is an option I hadn’t considered. Radiant heat waves heat only the objects the waves come in contact with adding an element of control to the process. so I’ll be keeping track of this thread for solutions to the raised questions.

DC:

--- Quote from: scp on September 26, 2019, 06:52:00 pm ---I occasionally used a heat gun in the way Badger does. But it was too noisy and tiresome. I started collecting heating coils and even fans to make a heating panel to be hung over the limb. I thought about using a radiant heater. Too much energy and somewhat dangerous. Finally I decided to buy the silicon heating blanket used to bend wood for string instruments. It does go up to 200C (392F) using just 300W. I think all I need is 170C (338F) that will make the wood plastic. But the belly started to burn at 150C. The belly was almost black and smoking probably after 30 minutes. I did put some wood blocks on top to keep the blanket in contact with the belly. Not a good idea? That was the first try about two weeks ago. I have not stringed the bow yet.

--- End quote ---
This sounds very promising although the numbers don't work for me. When I heat treat the wood doesn't start darkening until my thermometer reaches 400°f+. maybe my thermometer is wrong, don't know. How many times would this heater last using it like this? How expensive are they? Where can I read about them? etc etc

DC:
This was my first Google hit. It mentions 400°
http://www.scavm.com/blanky.htm

gifford:
Not trying to hijack the thread but does anyone else recall a fella cutting a hole in the back of his microwave, I believe it was an old Amana Radar Range (sure looked like the one we had IIRC).  Anyway, like others, the heat gun is a slow and noisy way to go but it does work and is likely a lot safer than microwaving the stave.

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