EXERCISE NO. 2 (Part 2) – OFF-HAND GRINDER- ANSWERS

1.   Match the symbols with the description:

1 .            v                                       4.   Type of abrasive

2.             46                                    5.   Grade of bond

3.             BE                                   6.   Structure

4.             38A                                 1.   Type of bond

5.             K                                      3.   Bond variation

6.             5                                      2.   Size of abrasive grain

 

2.   What answer best completes the statement best in three of the following:

A ringing sound produced when a suspended abrasive wheel is struck lightly with a wooden handle indicates that the wheel:

a.                      Is faulty

b.                      Is not cracked

c.                      Has an open structure

d.                      Is aluminium oxide

e.                      Has a fine grit size

 

3.   The first thing to do when changing the abrasive wheel on a grinding machine is to:

a.                      Remove the guard

b.                      Move the work rest clear

c.                      Check the wheel specifications

d.                      Check the spindle direction

e.                      Isolate the power supply

 

4.   To sharpen a hard cutting tool to a fine smooth edge which abrasive wheel is used.

a.              ( ) Coarse grit and soft bond?

b.              ( ) Fine grit and hard bond?

c.              ( ) Open structure and coarse grit?

d.              ( ) Soft bond and fine grit?

e.              ( ) Hard bond and close structure?

 

5.    Complete the following statement:

When an abrasive wheel is correctly mounted on the spindle of a grinding machine, the wheel should be separated from the flanges by:

                                                       Compressible washers