126) While power feed is engaged when turning taper by using taper turning attachment, it is noticed that for short distance parallel turning takes place due to certain defect. Which one of the following is the cause for this defect ?

The positioning of the taper turning attachment is not correct

The tool setting is not to the centre height

Play between the sliding units

Workpiece is not rigidly held

Answer is:

Play between the sliding units

Boring tool springs its travel

Coolant is not applied with force

Tool set below centre

No secondary clearance ground on the front cutting edge

Answer is:

support the tool rigidly to avoid chatter during operation

support long shafts that are being threaded for their full length

support workpiece during facing large diameter workpieces with short length

support long workpiece held in chuck, to perform operations at the overhanging end

Answer is:

The angle of chamfering is not correct

The chamfering tool not set square to the work axis

The work face not running true

The overhang of the tool is too much

Answer is:

length of the workpiece

material of the workpiece

diameter of the workpiece

operation to be performed on the workpiece

Answer is: