Joints and seams (110103d) Flashcards
what is the most common join in the sheet metal trade?
laps and offset lap
What is a fastener pitch?
this is the even spacing between the said fasteners.
What kind of allowance should an outside corner lap have?
1/8”
Were should fasteners be started?
in the middle working out
What is another name for pop rivets?
Blind rivets
how much of the rivet shank should be protruding out before being upset?
1 1/2 times the diameter of the rivet.
What is the female pocket depth on a Pittsburgh?
3/8” this will never change.
What is the minimum allowance that the Pittsburgh machine can run?
15/16”
were is a button lock used?
lighter gauge and lower pressure duct.
what is spot welding also know as?
Resistance welding
were is the dove tail seam most commonly formed?
in the field
How many brakes are on a rectangular hammerlock?
3
When setting the fingers on a bar folder what should they be set at?
width of the seam minus 2 metal thickness
what is the allowance for grooved seams lighter that 22g?
3w
what does thicker material allow for in regards to pitch?
larger pitch
