Shop Review Flashcards
Lab seem allowance
1W added only
Groove seam allowance
3w half and half added to each side of the pattern
Gore seem allowance
1/8 of an inch
Male Pittsburgh
1/4
Female, Pittsburgh
15/16
Describe bead on pipe
Provides a stop on small end and stiffness to round pipe seam should not be rolled
Longevity travels length of fittings. Examples are.
Snaplock
Lap seem
Groove seam
Circumference goes around the fitting what are examples
Lap seam
Elbow seam
How is small end stretch out marked?
Seven material sicknesses
3/16
Slip and Drive allowance must be added to pattern how much
1/2 inch
Hammerlock allowance
3W times its width
Ideal ratio for duct is
1:1
Adjustments to both the measurements should be considered when
4:1
Blueprints are drawn to what dimensions
Net patterns
Two views are required to develop a mitre line side, or elevation view
Front
Back view
How many element mines or ideal to be connected with a scribe mitre line
Three points
Transferring element lines on metal can be done how
Dividers
How many dimensions need to be established for round offset
Three
Four methods for developing offset
Given throat
Given the centreline
Given hell and bisecting the centreline
When are transition fittings used?
Aspect ratio
Architectural reasons
Why is the use of transitional fittings avoided
Time in money
Why is slip and drive trying to be adjusted for transitional fitting
S cleat can’t be an angle
The stretch out length of a hell runner should be
Calculated
Start assembling the gore section starting at
Small end
