120) Which is the possible cause when a twist drill produces a rough hole on the job ?

The clearance angle is too big

The clearance angle is too small

The cutting speed is too low

Feed rate is too high

Answer is:

Feed rate is too high

Counter sink drill 75 Degree

Counter sink drill 80 Degree

Counter sink drill 90 Degree

Counter sink drill 120 Degree

Answer is:

Poor wedging action

Weak cutting edge

Rough hole surface

Increased point angle

Answer is:

The bored hole has insufficient reaming allowance

Excessive cutting speed

Wrong selection of the reamer for the job

Insufficient coolant supply

Answer is:

Reduce the friction between the wheel face and the job

Wash away chips

Prevent loading of wheel

All of the above

Answer is:

Explanation:

Grinding fluids are used to
Reduce the friction between the wheel face and the job
Wash away chips
Prevent loading of wheel