stationary grinders

What does wheel size 200 25 19 (8" 1" ¾") mean?

diameter, width, diameter hole IN wheel

What two things should be taken into consideration when selecting the size of a grinding wheel?

a. the wheel diameter fits the grinder's wheel cover b. that the diameter hole in the wheel fits the spindle on the grinder, or has an adapter for it c. that the width of the grinding wheel will fit into the wheel cover.

Where would the wheel marking number be found?

on the grinding wheel

What do the five basic symbols of the wheel marking represent?

abrasive material, grain size, grade, structure, bond type

Which materials would an aluminum oxide abrasive grinding wheel be suited for grinding?

for grinding high tensile materials, steel, and steel alloys

The grade of a grinding wheel is designated by a letter from A to Z. Do the wheels get harder going toward A or going toward Z?

get harder from A-Z

What is the first thing that should be done when removing a grinding wheel?

unplug/ turn off

truing a grinding wheel

Truing is the process of shaping the grinding surface of the wheel to the desired profile.

Truing is the process of shaping the grinding surface of the wheel to the desired profile.

Dressing means to clean and restore the cutting action of the grinding wheel

loading of a grinding wheel

Loading is when small pieces of metal fill up the pores of the grinding wheel.

To what distance should the tool rest on the grinding wheel be adjusted?

adjusted 2 mm ( 1/16” ) to 4 mm (1 /8”) from the face of the grinding wheel.

When dressing a grinding wheel, the worker should always wear or a .

safety goggles or a face shield.

All material being worked on a grinder must be properly supported by

a tool rest

What is meant by the term "offhand grinding?"

this is hand held grinding

What must be done to the tool rest if the work piece requires grinding at an angle?

must be adjusted to the work angle

What is an indication that the cutting edge has been burnt during grinding?

the metal changing colour to blue or purple

What must be checked before using a grinder?

a. the tool rest is secure and properly adjusted, b. the grinding wheel is secure, c. the safety shield is in place, d. if the grinding wheel is dull - it must be dressed, and e. that all guards are in place.

Where should you stand when starting up a grinder?

stand to the side until it is up to operating speed

How should "high-speed" steel be cooled to prevent it from being burnt during grinding? Why?

should be air cooled during grinding because water cooling will cause the metal to crack

where should you stand when starting up a grinder

side until up to speed

Never grind on the _____________ of the grinding wheel.

side

If a small piece must be worked on a grinder hold it with

vise grip

What safety equipment must always be worn when grinding?

eye protection (goggles or a face shield)