Grinders Flashcards

1
Q

wheel guards on bench grinders should be be angled

A

30-45 degrees past vertical

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2
Q

the nut on the left hand side of a grinder has a ____ hand thread

A

left

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3
Q

the ability of a material to scratch of penetrate another material

A

hardness

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4
Q

the ability of material to withstand heat of grinding without becoming dull

A

heat resistance

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5
Q

the ability of material to resist impact and pressures created during grinding

A

toughness

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6
Q

the ability of material to fracture under stress along certain cleavage lines

A

friability

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7
Q

abrasive used for 75% of grinding, suitable for general work on all steels and ferrous metals except cast iron

A

aluminum oxide

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8
Q

abrasive used for high density materials such as cemented carbides, ceramics and stone
also used for low tensile and non ferrous metals

A

silicon carbide

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9
Q

what are the 3 grades (colors) of aluminum oxide grinding disc from strongest to weakest

A

grey-general purpose
light grey
white

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10
Q

what are the 2 grades of silicon carbide grinding disc

A

green-cemented carbides, ceramics, other hard material

black-cast iron and non ferrous metals

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11
Q

what are 3 bonds of grinding disc

A

vitrified
resinoid
rubber

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12
Q

bond used for 50% of all wheels produced, used for speeds up to 6500 rpm

A

vitrified

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13
Q

bond used in 33% of all wheels, used for rpm of 9500-16,000 rpm

A

resinoid

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14
Q

bond used for thin cut off wheel because of its strength and ability to withstand shock, used for up to speeds of 16,000 rpm

A

rubber

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15
Q

what are 6 markings on grinding wheels

A
abrasive type
grain size
grade
structure or density
bond type
manufacture record
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16
Q

the piece of paper attached to side of grinding wheel, purpose is to protect flange from abrasive grit and compensate for uneven surface

A

blotter wheels

17
Q

flanges on grinding wheel should be sized

A

1/3 of the wheel

18
Q

dressing of a wheel should be performed under what 2 conditions

A

glazed- when abrasive becomes dull the wheel has a glazed appearance
loaded-the particle become jammed with the material being ground

19
Q

what are 4 types of dressers/truing

A

mechanical
abrasive stick
abrasive wheel
diamond dresser

20
Q

the action used restore the shape of a wheel and makes the outer surface concentric with the bore

A

truing a wheel

21
Q

wheel used to polish work pieces to a high lustre, made and charged with fine abrasive such as a polishing rouge

A

buffing wheel

22
Q

wheel consist of coated abrasives attached to a hub, used for light finishing, especially inside a bore

A

flap wheel

23
Q

wheel coated with abrasive used for light finishing, deburring and chamfering

A

sanding disc

24
Q

grit size coarse, medium, fine, very fine

A

10/30/70/220