Laps And Seams Flashcards
What is one of the most common joints in the sheet metal trade?
Lap
What is meant by a fastener pitch?
Spacing
How much must be deducted from an outside lap?
1 1/2 times the diameter of the rivet
Spot welding is also known as what?
Adhesion or fusion
When spot welding where should I place my first spot weld?
Center working outwards
Pop rivets are also known as?
Blind rivets
How much should the rivet shank protrude through the material before upsetting the rivet?
1 1/2 times the diameter of the rivet
What is the allowance for a grooved seam?
3w
What is another name for a hammerlock?
Tap in
What is allowance for a hammerlock?
3w
What is the most common longitudinal seam used on medium pressure duct?
Pittsburgh
What is the pocket depth on a Pittsburgh female portion of the seam?
3/8
What is minimum allowance to run through a Pittsburgh machine?
7 inch
The male hook for a Pittsburgh is what width for duct and fittings?
1/4 duct
3/16 fittings
What rotary machine is used to turn an edge up on a rectangular elbow fitting?
Easy edger
What power machine is used to turn a 3/16 flange?
Power flanger
What bench machine is used to bend the male portion of a square throat elbow?
Cheek bender
Where is button lock used?
Lower pressure duct residential
What is the minimum edge distance for a fastener?
2 times the fastener diameter
When running a piece of material through the Pittsburgh machine what side should you be looking at inside or outside?
Inside
What seam is used in the field on round pipe to fasten to a piece of duct?
Dovetail
