Grinders Flashcards
wheel guards on bench grinders should be be angled
30-45 degrees past vertical
the nut on the left hand side of a grinder has a ____ hand thread
left
the ability of a material to scratch of penetrate another material
hardness
the ability of material to withstand heat of grinding without becoming dull
heat resistance
the ability of material to resist impact and pressures created during grinding
toughness
the ability of material to fracture under stress along certain cleavage lines
friability
abrasive used for 75% of grinding, suitable for general work on all steels and ferrous metals except cast iron
aluminum oxide
abrasive used for high density materials such as cemented carbides, ceramics and stone
also used for low tensile and non ferrous metals
silicon carbide
what are the 3 grades (colors) of aluminum oxide grinding disc from strongest to weakest
grey-general purpose
light grey
white
what are the 2 grades of silicon carbide grinding disc
green-cemented carbides, ceramics, other hard material
black-cast iron and non ferrous metals
what are 3 bonds of grinding disc
vitrified
resinoid
rubber
bond used for 50% of all wheels produced, used for speeds up to 6500 rpm
vitrified
bond used in 33% of all wheels, used for rpm of 9500-16,000 rpm
resinoid
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
rubber
what are 6 markings on grinding wheels
abrasive type grain size grade structure or density bond type manufacture record