13) An external hexagon is machined by a slotter. After slotting it is found that it has rounded corners. Which one of the following is the reason for this ?

The diameter of the blank is less than that required

The flat-to-flat size is incorrect

Either 'A' or 'B'

Neither 'A' nor 'B'

Answer is:

Either 'A' or 'B'

Pawl and ratchet wheel mechanism

Worm and worm wheel mechanism

Cam mechanism

Bevel gear mechanism

Answer is:

Explanation:

Pawl and ratchet wheel mechanism is used for driving the main shaft of a slotter.

In a slotter, the feed is given at the beginning of the cutting stroke

The feed mechanism in the slotter is used to drive the tool

For slotting external hexagon, a ring of diameter less than the distance flat-to-flat is required to support the job

In a slotter, the feed direction can be reversed

Answer is:

Stellite tool

Cemented carbide tipped tool

High carbon steel tool

High speed steel tool

Answer is:

Explanation:

Cemented carbide tipped tool can cut efficiently with negative rake angle on hard metals.

Depth of cut and condition of machine

Rigidity of job holding

Material of tool and workpiece

All the above

Answer is:

Explanation:

Slotter cutting speed depends on
Depth of cut and condition of machine
Rigidity of job holding
Material of tool and workpiece