Grinding

Question 1

True or false: Thermite is composed of powdered aluminum and iron oxide.

Answer 1

True

Question 2

What is the danger of using a belt sander to grind away rust after it has been used to grind aluminum?

Answer 2

It creates thermite. The rusty steel (iron oxide) can generate heat and sparks which ignites the thermite and can create explosive reactions.

Question 3

What is the primary function of grinding?

Answer 3

To smooth and finish a product (often to specific size)

Question 4

What are the two major types of grinding?

Answer 4

(1) Offhand Grinding (grinder or workpiece held by hand)
(2) Precision Grinding (variety of operations done to machine work to extremely close tolerances)

Question 5

What are some of the basic grinding operations? (6)

Answer 5

(1) Cylindrical Grinding
(2) Plunge-cut Grinding
(3) Form Grinding
(4) Internal Grinding
(5) Surface Grinding
(6) Centerless Grinding

Question 6

What is the difference between external and internal grinding?

Answer 6

External grinding occurs on the outside of the work surface while internal grinding is usually performed to shape a cylindrical hole

Question 7

How can you grind on a lathe?

Answer 7

Mounting a tool post grinder. This can be used for both internal and external grinding operations.

Question 8

What test should you always perform before mounting a grinding wheel?

Answer 8

A “ring” test

Question 9

What should you never do when installing a grinding wheel? (3)

Answer 9

(1) Never exceed speed recommendations
(2) Never force a wheel onto an arbor
(3) Do not over tighten

Question 10

What should you always ensure when installing a grinding wheel?

Answer 10

(1) Flanges are recessed
(2) Flange diameter should be at least 1/3 wheel dia.
(3) Soft blotter must be between flange and wheel