How To Bend Sheet Metal For Ductwork

How do you bend a flat sheet of metal into a rectangle or l section if there is a profile rollformed on the two vertical edges of the blank as it approaches the braking station.

How to bend sheet metal for ductwork.

To form the operator marks the bend line on the sheet as a guide then lines it up with punch tip and performs a shallow bend. Leave backing on the tape on metal ductwork. Monkeys spinning monkeys by kevin macleod. If the ducts are going to be concealed all seams need to be taped or caulked.

Cross braking is done using benders like this one from roto die. Peel off part of the backing. Here s bob s trick for taping a seam on a pipe that s installed close to the subfloor. A second bend is made across this initial one leaving an x impression on the sheet.

To remove irregularity or improve uneven bends place a hardwood piece lengthwise along the bend and hit the bend with increased strength using a heavy duty hammer or mallet. In some cases as with thicker sheet of metal you may need to use a sheet metal brake to apply your bend. V notches are the bending notches on straight duct on slip drive.