Grinders Flashcards
Hand grading machines are
Grinders where the work is geld and guided by the hand
Exhaust tube
A collection tube that directs dust and particles
Water pots
Small containers used to keep work piece cool by quenching
Eye shield is
Transparent cover that protects the face and eyes
Wheel guards
Cover most of grinding wheel
Tool rest
Small platform mounted with ita surface at or slightly above centre of the wheel and provides resting spot for work piece
Only grind on the _____ of the wheel
Surface, do not use sides
Side wheel grinders are the same as pedestal and bench grinders, except
You grinders on the side of the wheel instead of the face
2 advantages of side wheel grinders
Grinding face is flat
The angle of the work rest does not change as the grinding wheel gets smaller
Belt grinders
Used for grinding and polishing operations
Wire wheel
Used to clean a workpiece of scale and dirt and leaves a finish of uniform fine scratches
Buffing wheels
Used to polish workpieces to a high Lustre
Grinding discs
For cut off operations
Sanding disc
Coated abrasives used for light finishing, deburring or chamfering
Flap wheels
Consist of straps of coated abrasives, used for light finishing operations
Aluminum oxide
Is made from bauxite ore
Grey to white
Aluminum oxide wheels make up __% of all grinding wheel
75 %
Aluminum oxide is suitable for general grinding on all steels and most high tensile ferrous metals except
Cast iron
Silicon carbide is made in furnaces from what
Silica sand Coke and sawdust
Silicon carbide ranges in color from green to black And is harder and tougher then
Aluminum oxide
CBN stands for
Cubic boron nitrade
Synthetic diamonds are produced for
Grinding and are Better than natural diamonds because specific requirements can be reached
Abrasives have the following properties (4)
Hardness
Heat resistance
Toughness and
Friability
Hardness is the
Ability of material to scratch or Pentwater another material
Heat resistance is the
Ability of material to withstand the heat of grinding without becoming dull
Toughness is the
Ability of material to resist impact and pressures created during grinding
Friability is the
Ability of material to fracture under stress along certain Cleavage lines so that as the cutting edge’s become dull part of the grain breaks off and presents new cutting edges
The smaller the number of grains
The larger the grit size
The larger the number of grains
The smaller the grit size
Bonds hold
The grains together
The amount of bond and the type used determine
The hardness of the wheel
3 most common types of bonds
Vetrified (V)
Resonoid (B)
and Rubber (R)
