Gearing

Question 1

It is the radial diantace from the pitch circle to the top land of the tooth , what is this tooth called

Answer 1

Addemdum

Question 2

Is the radial from the pitch Circle to the bottom land of the tooth, what is the tooth called?

Answer 2

Dedendum

Question 3

Is the total height of the whole tooth , so addendum plus dedendum

Answer 3

Whole depth

Question 4

This one is that the gear tooth extends toward the root of the matting tooth , when both are in full mesh .

Answer 4

Working depth

Question 5

Thickness of a gear tooth at pitch circular , indicates tooth strength

Answer 5

Chordal thickness

Question 6

These gear have teeth cut at a helix angle , they are stronger and have more teeth in contact at one time than a spur gear

Answer 6

Helical gears

Question 7

The teeth rows are offset or non- symmetrical or non symmetraical in line , the advantage of using double helical gears is that axial thrust is cancelled by the opposite row teeth, what gear is this

Answer 7

Double helical gears

Question 8

These gears are recommend for high sapped applications and heavy loads , these gears must be mounted on shafts that are parallel to the

Answer 8

Herringbone gears

Question 9

This gear is supported by a bearing on each side , which allows minimal gear and shaft deflection , which gear is this ?

Answer 9

Straddle mount

Question 10

The is gearing is only supported by a bearing on each side . These hears are also good for small load , but under severe shock loads, which gear is this?

Answer 10

Overhung

Question 11

The shafts of this gear intersect at 90 degrees and they gave the same number of teeth , so there is no speed change , also the ratio for this gear is 1:1 , what gear is this ?

Answer 11

Mitre gears

Question 12

These gears shave curved teeth that are angular to shaft axis

Answer 12

Sprail bevel gears

Question 13

These gears are smoother and quieter than straight cut gears , they do not have axial thrust Like spiral bevel gears

Answer 13

Zero bevel gears

Question 14

This gear crosses over between two shafts are at 90 degrees

Answer 14

Hypoid gears

Question 15

This gears transmit power through shafts that cross over at right angles , this gear is very quiet screw likes thread and steady

Answer 15

Worm gears

Question 16

This is the distance from one tooth to the next tooth on worm

Answer 16

Worm pitch

Question 17

The teeth of this gear are on the outside of both the pinion and the
gear. The connected shafts of external spur gears rotate in opposite
direetions.
Which gear is this ?

Answer 17

External spur gear

Question 18

Is the rotational arc clearance between arc between a pair of mounted gears , lack of this function can cause noise ,overloading , over heating and even failure

Answer 18

Backlash

Question 19

How can back lash be checked?

Answer 19

Using a dial indicator
Lead wire
Feeler gauges