Abrasive Wheels Training Certificate Mounting and Balancing

Question 1

What is the primary purpose of blotters (compressible washers) when mounting an abrasive wheel?

Accepted Answer

To distribute clamping pressure evenly and prevent stress concentration

Answer

To increase the speed of the wheel

Answer

To make the wheel easier to remove

Answer

To reduce the noise during grinding

Question 2

When tightening the spindle nut on an abrasive wheel, how tight should it be?

Accepted Answer

Hand tight, then one quarter turn with a spanner

Answer

As tight as possible using a pipe wrench for extra leverage

Answer

Finger tight only

Answer

Torqued to exactly 50 Nm as per BS EN 12413

Question 3

What is the recommended standing position when first starting an abrasive wheel after mounting?

Accepted Answer

To one side of the wheel, out of the plane of rotation

Answer

Directly in front of the wheel to observe it closely

Answer

Behind a colleague for protection

Answer

It does not matter where you stand

Question 4

What minimum period should a newly mounted vitrified abrasive wheel be allowed to run at full operating speed before use?

Accepted Answer

1 minute

Answer

10 seconds

Answer

30 seconds

Answer

5 minutes

Question 5

What is the maximum permissible gap between the wheel and the work rest (toolrest) on a bench grinder?

Accepted Answer

2 mm

Answer

1 mm

Answer

5 mm

Answer

10 mm

Question 6

What is the correct procedure if an abrasive wheel is found to be out of balance after mounting?

Accepted Answer

Use the adjustable balance weights in the wheel's balancing hub or dress the wheel

Answer

Continue using it as balance does not affect safety

Answer

Add counterweights to the flanges using adhesive tape

Answer

Increase the spindle speed to compensate for the imbalance