How to Adjust a Pittsburgh Lockformer


A Pittsburgh lock provides an airtight seam on medium and low pressure duct-work without the need to lay out and hand bend each part of the lock. Lockformer Pittsburgh machines use a series of rolls to fold metal into the form of a Pittsburgh. An improperly adjusted Lockformer will cause the metal to split from excessive pressure or form a loose seam that does not create an airtight seal. Regularly adjusting the roll tension of the machine will ensure that a rolled Pittsburgh seam will provide the correct amount of tension to seal the duct seam.

Things You'll Need

  • Socket set
  • 1/2-inch drive ratchet handle
  • Disconnect the power from the Lockformer machine.

  • Match a socket from a socket set to the size of the bolts holding the cover on the top of the Pittsburgh Lockformer machine. Secure the socket to the 1/2-inch drive ratchet handle. Turn each bolt counterclockwise with the ratchet handle. Set the bolts aside. Lift the cover from the Lockformer.

  • Exchange the socket on the ratchet handle for one that fits the hold-down bolts located on the top center section of the rolls. Turn both bolts clockwise until tight. Reverse the direction of the ratchet. Turn each bolt 3/4 turn counterclockwise.

  • Set the cover onto the Lockformer. Thread each cover bolt into the machine. Tighten the bolts to secure the cover to the machine.

  • Plug in the power to the Lockformer.

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