Shafts & Fits

Question 0

Pratt & Whitney

Answer 0

• round ended keyseat

- used when the hub slides back and forth

Question 1

Keys

Answer 1

• timing devices & torque

- should fail before anything else does, just like a fuse

Question 2

Woodruff Key

Answer 2

• 1/32 width 1/8 diameter

- lighter applications

Question 3

Tapered Gib key

Answer 3

• taper of 1/8 inch per foot

- do not use with cast iron or the hub with crack

Question 4

Splines

Answer 4

-

Question 5

Key width rule of thumb

Answer 5

-1/4 inch of the diameter of the shaft

Question 6

QD detachable bushing

Answer 6

-recognizable by the axial split through the barrel and the flange

Question 7

Bending stress

Answer 7

-

Question 8

Torsional shear (twisting) stress

Answer 8

-nonuniformal

Question 9

Helical spline

Answer 9

• will offset or counteract the axial or end thrust

- 2 helical gears in mesh and rotating under torque produce thrust

Question 10

Types of stainless steel

Answer 10

-

Question 11

Difference between tolerance and fit

Answer 11

• Tolerance is total permissible variation

- fit is permissible tightness or looseness

Question 12

Carbon

Answer 12

-principal hardening element in steel

Question 13

Chromium

Answer 13

-improves steels hardenability, abrasion resistance and wear

Question 14

Copper

Answer 14

-improves resistance to corrosion

Question 15

Lead

Answer 15

-improves machinability of steel

Question 16

Tolerance symbols

Answer 16

• hole is “H”

- bore is “b”