# Machine Tools Questions and Answers – Lathe : Calculation of Change Gears

This set of Machine Tools and Machining Quiz focuses on “Lathe : Calculation of Change Gears”.

1. In simple gear, the intermediate gear has no effect on the ratio between the driver and the driven.
a) true
b) false

Explanation: This is true. The intermediate gear has no effect on the ratio between the driver and the driven, but merely acts as a connection between the two and serves to keep the rotation of the driver and driven in the same direction.

2. The gear connections on a lathe______
a) always compound
b) always simple
c) may be simple or compound
d) none of the mentioned

Explanation: The gear connection on a lathe may be simple or compound depends upon the requirement. It is versatile.

3. The gear on the stud shaft acts as a _____
a) driver
b) driven
c) can’t say anything
d) none of the mentioned

Explanation: The gear on the stud shaft act as a driver. It can be considered as spindle gear as usually it runs at the same spindle speed.

4. Which of the following is also known as Norton gearbox?
a) simple gear train
b) compound gear train
c) quick change type of gearbox
d) none of the mentioned

Explanation: Quick change type of gearbox is also known as Norton gearbox. It covers all the ratio of screw cutting and feed rate likely to be wanted.

5. In Norton gearbox, gear changing is effected by the movement of_____ levers.
a) one
b) two
c) three
d) four

Explanation: Gear changing is affected by the movements of two levers as well as a sliding gear. This eliminates the need to remove and change the gears as in the standard change gearbox.
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6. Teeth on driven gear / teeth on driver gear =_______ T.P.I on lead screw=a, T.P.I. on work piece=b.
a) a/b
b) b/a
c) a*b
d) none of the mentioned

Explanation: (b/a) – This is the suitable ratio for threads where T.P.I on lead screw=a, T.P.I. on work piece=b. If the units of workpiece and leadscrew threads are different, in that case the gears are calculated as follows: 1 inch = 25.4 mm.

7. Driver gear/driven gear =______ pitch of work piece threads=a, pitch of lead screw =b.
a) a/b
b) b/a
c) a*b
d) none of the mentioned

Explanation: It is the suitable ratio. In British it will be equal to (a/b)*(5/127).

8. Lead screw pitch=6mm, work piece pitch=1mm. Find change gears.
a) 6
b) 1/6
c) 3
d) none of the mentioned

Explanation: Change gear=work piece pitch/lead screw pitch. From this formula, we can easily get 1/6 as a answer.

9. Change gear=2, lead screw pitch = 8. Find work piece pitch.
a) 4
b) 16
c) 2
d) none of the mentioned

Explanation: Change gear=work piece pitch/lead screw pitch. So, work piece pitch = change gear*lead screw pitch
= 2*8
= 16

10. In a compound train, the stud carriers______ gears.
a) 1
b) 2
c) 3
d) 4