Abrasive Wheels Training Certificate Mounting and Balancing 2

Question 1

What must be checked about the flanges before mounting an abrasive wheel?

Accepted Answer

That they are clean, flat, undamaged, and of equal diameter (at least one-third of wheel diameter)

Answer

That they are painted the correct colour

Answer

That they are made of plastic

Answer

That they are larger than the wheel diameter

Question 2

Why should an abrasive wheel never be force-fitted onto a spindle?

Accepted Answer

Forcing can crack the wheel, leading to catastrophic failure at operating speed

Answer

It voids the manufacturer's warranty

Answer

It makes the wheel spin faster than intended

Answer

It is not a legal requirement, just best practice

Question 3

On a double-ended bench grinder, what is the purpose of the tongue guard (spark guard)?

Accepted Answer

To prevent sparks from reaching the operator and to limit the exposed portion of the wheel

Answer

To collect metal filings for recycling

Answer

To improve the quality of the grinding surface finish

Answer

To cool the workpiece during grinding

Question 4

What should be the maximum gap between the tongue guard and the abrasive wheel on a bench or pedestal grinder?

Accepted Answer

6 mm

Answer

2 mm

Answer

10 mm

Answer

15 mm

Question 5

What is the correct method for checking an abrasive wheel for cracks before mounting (the 'ring test')?

Accepted Answer

Suspend the wheel on a pin or finger through the bore and tap gently with a non-metallic implement, listening for a clear ring

Answer

Spin the wheel on its spindle and listen for unusual sounds

Answer

Drop the wheel from 1 metre onto a concrete floor

Answer

Submerge the wheel in water and look for air bubbles

Question 6

When mounting a new abrasive wheel, in what order should the following steps be performed?

Accepted Answer

Visual inspection, ring test, mount with blotters, tighten correctly, run idle at full speed standing to one side

Answer

Mount wheel, tighten nut fully, connect power, run at speed

Answer

Connect power, mount wheel, add blotters, tighten nut

Answer

Ring test, force onto spindle, tighten with pipe wrench, test immediately on workpiece