Making a whatsit

steamer · 2011-07-18T17:43:10+00:00

--For a long time I've wanted to have a rotary welding table so's Idon't have to weld round stuff in 4 sections, turning the assembly eachtime. Well they're available but they cost a bloody fortune. So my idea wasto modify one of those windshield wiper motor assemblies, the ones with the20-to-1 worm drive. Turns out that's not nearly slow enough, even with thefinest motor controller. I'd messed around with the idea of adding agearbox to slow it down further but the cost of the components wasn't small.Then a pal suggested I couple two of the worm drive units in series andthat's what I've started to do. Here's a photo of the 'output' stage; so farI've removed the motor and machined a shaft support. Support has an internaloilite bushing and shaft has a collar inside to limit longitudinal play.More photos to follow when I get more built..

Jul 18, 2011 21 Replies

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Ernie Leimkuhler 14 years ago

You do NOT want a speed control in your foot pedal. Trust me on this. The foot pedal should be ON and OFF only. Put the variable speed knob on the machine.

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RoyJ 14 years ago

Roger that. On off only. On a rotary table you want to hold the gun and move the part uniformly to get a perfectly uniform weld bead.

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