Grinders Flashcards
What do the two grinding wheels have in common with the axle?
They’re both mounted to the same axle and the right side disc has a right-hand locking nut in the left-hand disc has a left turn locking
How far should a grinding wheel guard extend past vertical ?
30° to 45°
What do more powerful electric motor grinders run at rpm ?
1750 RPM
Belt Grinders come in widths of what range ?
1/4 to 26 inch
Name for natural abrasives
Corcus, reddish brown fine powdered oxide of iron
Corundum or aluminum oxide
Emery, mix of iron and aluminum oxide
Diamond
What is cubic Boron nitride ?
Unites boron nitrogen under heat and pressure is used on space-age materials
What are the three types of bonds used in a grinding wheel
Vitrified designated by letter V good for speed up to 6500rpm
Resinoid designated by letter B good for speed up to 9500-16000 rpm
Rubber designated by letter R up to 160000
When setting that tool rest/workrest on grinder it must be set at ?
1/16 of an inch and must never exceed 1/8 of an inch
What should the gap of the Spark guard on the grinding wheel be set to
Should be between 1/16 and 1/4 inch
Flanges on the grinder should be at least what diameter of the wheel
Flanges should be at least one third the diameter of the wheel and both flanges must be the same diameter
When using a diamond dresser you should?
The depth of the cut should be very light 0.001 of an inch and a tool should be held at a 15° drag angle and 30° lead angle to reduce chatter keep the diamond sharp
The kind of abrasive material used in grinding wheels for general-purpose applications is?
Aluminum oxide
A blotter is used on a grinding wheel to?
Protect the flanges from abrasive grit of the wheel display information about the wheel and the composite for the uneven surfaces on the wheel
Flanges should be at least
1/3 the diameter of the wheel
Under properties of abrasives the term hardness refers to?
The ability of a material to scratch or penetrate another material
