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Old 2010-03-03, 8:41am
Dale M.'s Avatar
Dale M. Dale M. is offline
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
Posts: 5,200
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Foot pedals is just a series of valve connected to a believe it or not a " foot pedal" similar to one for sewing machine or rotary tool or accelerator pedal in a car..... And one point (we will call low) it just runs the inner fire (small flame) of a "monster" torch because the valves (either mechanical or electrical) only allow fuel/oxygen to inner fire, if you want to activate the the "outer portion" of torch, you press down on foot pedant which cause the valves that control oxygen/fuel to open and supply the "outer ring" (large fire) once you do not have need for extra heat you rock back (release pressure) on foot pedal and it closes the valves for the outer ring and the outer flame goes out....

Visualize this, little (or no) pressure on pedal smaller flame (much like slow rotary tool) and you increase pressure of foot pedal bigger flame (faster rotation of rotatory tool)...

Concept is simple, how ever the plumbing is a little more complex but not so difficult the average lampworker can't hook one up ....

Dale
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