If the compound swivel base is set on 60 degrees at the lathe centerline index, how many degrees will the reading be at the cross slide index? A. 45 B. 150 C. 30 D. 90

C. 30°

Explanation:

Given that compound swivel base is set on 60° at the lathe center line index.

We need to find reading on cross slide index

We know that relationship between center line index and cross slide index in angle 2∝=β

Where ∝ Angle of swivel and β is the reading on cross line index.

So by using above relationship between center line index and cross slide index

2∝=60°⇒∝=30°

So our option is C.