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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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I need to heat a roller...?
For a project I am working on, I need to heat a roller.
The roller in question is a tube about eight feet long, horizontal, about five inches in diameter and .049" thick aluminum wall. It turns on a 3/4" axle and is supported on three spiders at the center and ends, so that air can flow through. The whole machine is always indoors, in ~70F room-temperature conditions. For other reasons it can't be used in drastically colder temperatures. I need to be able to heat this whole thing to maybe 120F to 150F, automatically. That is, I want to set a temperature and forget it. The wattage I am guessing might take 1000 watts, and it must be electric (dry) heat--propane will not help, as it gives off water vapor. Are there any cheap UL-listed devices around built for doing this? I can construct a "fan box" to use a separate fan to circulate the air if need be. I really just need the heater circuit and elements... The fan motor may not be able to withstand 150F so it will be separated from the hot-air loop, but that's not a problem. I know that there are industrial-devices known as 'drying-room heaters' but they are way overbuilt and too expensive for my meager budget. There must be something cheap and available that I can abuse reasonably-safely to do this. I'd prefer lowering the operating temperature of a device built for higher temps, than raising the temperature of something meant for lower temps.... I have looked at a bunch of toaster-ovens and the lowest "warm" setting for the food seems to usually start at 150F. I have a multimeter with some thermal probes so I can test temps fairly decently and I know a bit about electronics but don't know if there's any easy way to recalibrate the heat to a lower temp. |
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