How to make a pittsburgh joint in sheet metal by hand 2 how does spot welding work.
Pittsburgh joint sheet metal.
In sheet metal shops a rollforming machine is used to fold the pittsburgh seam on one end of a piece of ductwork for example.
This increases productivity while keeping each seam consistently formed on multiple pieces of duct.
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It is a very efficient machine to bend straight duct joints and fittings with tdc type and tdf type flange connectors.
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The grooved seam joint fig.
The button punch snap lock is used in the same way as the pittsburgh lock for joining comer sections of sheet metal.
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Designed so one operator can quickly slide a piece of sheet metal into the machine and align the notches in an instant on the.
A pittsburgh lock consists of three bends that form an extended s shape which creates an airtight seal after completion.
The pittsburg joint is used for most commonly fabricated metal retangular ducts.
2 57 is one of the most widely used methods for joining light and medium gauge sheet metal.
It consists of two folded edges that are locked together with a hand groover fig.
When making a grooved seam on a cylinder you fit the piece over a stake and lock it with the hand groover fig.
Most modern sheetmetal fabrication shops use a mechanized piece of equipment to create the pittsbugh joint on one.