Abrasive Wheels Training Certificate Work Rest Adjustment and Operating Techniques 1

Question 1

What is the maximum recommended gap between the work rest and an abrasive wheel on a bench or pedestal grinder?

Accepted Answer

3 mm

Answer

HSE guidance states the work rest must be adjusted to within 3 mm (approximately 1/8 inch) of the wheel to prevent the workpiece from being drawn into the gap.

Question 2

When should the work rest on a grinding machine be re-adjusted?

Accepted Answer

Whenever the gap exceeds the safe limit due to wheel wear

Answer

As the abrasive wheel wears down during use its diameter decreases, increasing the gap between wheel and rest, so re-adjustment is required whenever the safe limit is exceeded.

Question 3

At what height should the work rest be set relative to the centre of the abrasive wheel?

Accepted Answer

At or slightly above centre

Answer

Setting the rest at or slightly above the wheel centreline ensures any downward grinding force directs the workpiece onto the rest rather than trapping it between the wheel and the rest.

Question 4

What is the primary reason for keeping the work rest as close to the abrasive wheel as possible?

Accepted Answer

To prevent the workpiece from being drawn between the wheel and rest

Answer

If the gap is too large, a workpiece can be snatched and violently pulled into the gap, causing serious injury to the operator or shattering the wheel.

Question 5

Who should carry out adjustments to the work rest on a pedestal grinder?

Accepted Answer

Only an appointed, competent person

Answer

Under UK regulations, work rest adjustments must be carried out by an appointed, competent person to ensure they are set correctly and safely.

Abrasive Wheels Practice Test

Abrasive Wheels Practice Test

Abrasive Wheels Training Certificate Work Rest Adjustment and Operating Techniques 1