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Feb13-11, 07:09 PM
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Hi g124, welcome to the board. It sounds like you want to have heat generated by the mechanical action of shaking or impact as opposed to a chemical means. If that's the case, then there is no way to do what you're asking for and there's a simple reason why. For a device that doesn't change chemical composition and only has the energy input from a person shaking their hands, all the energy to heat the mass has to come from the energy input which is the shaking motion. That shaking motion doesn't represent any more heat than what you get rubbing your hands together, so 400 F isn't going to happen without a hell of a lot of hand shaking.