shafts, fits, lubrication test Flashcards
keys are timing devices are designed to fail before any other part in a gear train, shaft or hub assembly
true
false
true
the width of a square or flat key should be about ____ of the shaft diameter
1/8
1/4
1/3
1/2
1/4
a pratt and whiteny key _______________________
does not require a key seat in the shaft
is a boxed or blind key
can be fixed or sliding
has a taper 1 in 96
can be used on a parallel or tapered shaft
is a boxed or blind key
a woodruff key
does not require a key seat in the shaft
is boxed or a blind key
can be fixed or sliding
has a taper of 1 in 96
can be used on a parallel or tapered shaft
can be used on a parallel or tapered shaft
a tapered gib head key
does not require a key seat in the shaft
can be boxed or a blind key
has a taper of 1 in 96
can be used on a parallel or tapered shaft
has a taper of 1 in 96
a saddle key
does not require a keyseat in the shaft
can be boxed or a blind key
can be fixed or sliding
has a taper of 1 in 96
can be used on a parallel or tapered shaft
does not require a keyseat in the shaft
a feather key
does not require a key seat in the shaft
can be boxed or a blind key
can be fixed or sliding
has a taper of 1 in 96
can be used on a parallel or tapered shaft
can be fixed or sliding
if you had a woodrufr key with a number of 406, the width would be_______ and the diameter would be______
1/16, 1
1/8, 3/4
1/4, 1/2
1/8, 1/2
1/8, 3/4
first number x 1/32
last 2 numbers x 1/8
the accurate, proper depth of a key seat in a shaft is measured from
the bottom of a key seat to the top of the key seat end
the bottom of the key seat to the top of the key seat side
the bottom of the shaft to the bottom of the key seat
none of the above
the bottom of the shaft to the bottom of the key seat
parallel key seats in shafts can be open or tapered
true
False
false
you should not use a_______________key with a cast hub
gib head parallel
feather
pratt and whitney
tapered key
tapperd key
key stock is manufactured with low to medium carbon steel (AISI) 1020 to a ___________tolerence
minus (under sized)
plus (over sized)
size on size
plus (oversized)
when installing keys, on shafts and in tapered bushings, you can put anti-seize on the keys and tapers of the bushings to help stop seizing and damage to the bushing, key seats and the key
true
false
false
key seats in hubs and attachments will be cut to a depth equal to
half the key
half the key plus the clearance
half the hub width plus the tolerance
half the key minus the clearance
half the key plus the clearance
you can cut key seats with
portable key seat cutter
hand broaching with an arbor press
milling machines with endmills
all the above
all the above
when fitting keys, a class ______ fit has a tight fit while a class_______ fit has a clearance fit
1, 2
3, 2
2, 1
2, 3
class 2 is tight class 1 has clearance
there should always be a clearance (0.005”) on the ________ of a key
top
end
bottom
side
top
setscrews are used to lock attachments onto shafts. for positive locking power, you should
use 2 setscrews of a similar width to the key. one on the key and one 90 degrees to the first
lubricate the threads on the setscrew for maximum thrust
use a knurled cup point setscrew for positive positioning
all the above
all the above
to help facilitate removal of hubs and attachments, you should
make sure there are not 2 setscrews in the hole
file a flat where the setscrew fastens to the shaft to eliminate hang-ups from burrs
use fox wedges to help in removal of gib head keys
all the above
all the above
to help facilitate removal of tapered keys, the gib head should be about 1/4” away from the hub to allow for wedges
true
false
true
