127) Unusual sound is heard during rough boring a large diameter hole. Which one of the following statements is the cause for this defect ?

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:

Boring tool springs its travel

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:

allowing dismantling of the top slide easily

eliminate the backlash of the screw and the nut in the assembly

adjust the slackness developed due to wear

permit flow of the lubricant between the sliding surfaces

Answer is: