To form elbows use a manual or powered right angle flanger and slip rolls.
Snap lock pittsburgh lock sheet metal fitting.
The pittsburgh lock seam fig.
Button snap lock and s clip need 9 sets of roller dies.
7 snap lock technology galvanized pipe round and oval 14 pipe 16 pipe 18 pipe 20 pipe 24 pipe 12 pipe 10 pipe 9 pipe length gauge item 2 24 140209.
Originally formed in the brake or press brake today roll forming machines are used to form the pocket on one piece and the flange on the other piece.
Figure 2 69 shows a cross section of the two pieces of metal to be joined and a cross section of the finished seam.
2 69 is a comer lock seam.
The common type of longitudinal seam is the pittsburgh lock seam.
Even for radius fittings.
Machines used in high volume applications to form metal by running material through rollsets which progressively change the shape or profile.
Provide custom shapes and industry standard shapes such as pittsburgh snap lock button lock standing seam etc.
Puts the flange and dimple in at the same time.
Pittsburgh lock drive cleat and acme double seam are made on a machine with at least 5 sets of roller dies.
Two piece duct showing the 5 16 pocket of the female pittsburgh and the 7 32 right angle flange of the male pittsburgh.
The radius button lock machine is the way to go.
When it comes to rectangular duct the pittsburgh lock is considered the longitudinal seam in commercial ductwork.
Snap lock button lock is for sure the best way to go.
The male seam is a button the female seam is a lock and the two snap together for a flush corner.
These machines can form 0 4 to 1 2 mm sheet metal into female locks on the inboard and button punched right angle flanges on outboard rolls at speeds of 18m min and are available in seven and nine forming station machines.
This seam is used as a lengthwise seam at comers of square and rectangular pipes and elbows as well as fittings and ducts.
If you need to feed lots of metal to a rollformer consider using an uncoiler.
You put the flange on the same way as the pittsburg cept you need a longer flange.
After one piece is inserted in the pocket the tail in hammered over to close the lock.
Commonly used in the hvac industry roofing industry etc.
A radius elbow consists of 2 cheeks these are the sides of the fitting and it s on the top part of this cheek that the right angle flange is turned at a 90ยบ angle.
