Chapter 26

swing grinder 😂

a form of abrasive machining like pedestal-type

off-hand grinding

a grinding method for sharpening single-point tools

surface grinding

a grinding method primarily used to grind flat surfaces although irregular surfaces can be produced on some types of grinders by use of a formed wheel

centerless grinding

a grinding process that makes it possible to grind both internal and external cylindrical surfaces without requiring the workpiece to be mounted between centers or in a chuck

abrasive

a hard material that can cut or abrade other substances

abrasive machining

a material removal process that involves the interaction of abrasive grits with the workpiece at high cutting speeds and shallow penetration depths

lap

a material that is usually a cloth or cast iron that fine abrasive particles are embedded in

abrasive water-jet cutting (AWC)

a metel working application where abrasives are added to a water jet during cutting

emery

a mixture of alumina and magnetite , still used today on coated paper and cloth

universal tool and cutter grinder

a more sophisticated grinding machine for complex tools

coated product

a product covered in abrasive particles mounted in resin on a belt

bonded product

a product with abrasive particles close packed into wheels or stones with abrasive grits held together by bonding material

crush dressing

a roller is placed pressing down on a grinding wheel to grind away the shape into the wheel that is desired on the workpiece

honing

a stock-removal process that uses fine abrasive stones to remove very small amounts of metal. Used to size and finish bored holes

snagging

a type of rough manual grinding that is done to remove fins, gates, risers, and rough spots from castings or flash from forgings, preparatory to further machining

superfinishing

a variation of honing that is typically used on flat surfaces

honing stone

abrasives that differ from grinding wheels in that additional materials, such as sulfur, resin , or wax, are often added to the bonding agent to modify the cutting action

coated abrasive (you mean sandpaper?)

abrasives used in finishing both metal and nonmetal products, made by gluing abrasive grains onto a cloth or paper backing

lapping

an abrasive surface finishing process wherein fine abrasive particles are charged into a soft material called a lap

abrasive jet machining (AJM)

an inexpensive process that removes material by a focused jet of abrasives and is similar to water jet cutting except instead of water gas is being used

ultrasonic impact grinding 😂

an ultrasonically vibrating tool is used to impel the abrasives in a slurry at high velocity against the workpiece

ultrasonic machining (USM)

an ultrasonically vibrating tool is used to impel the abrasives in a slurry at high velocity against the workpiece

superabasive bond

bond used on grinding wheel that is either electroplated or vitrified CBN surrounds a steel core.

shellac bond

bond used on grinding wheel to get a high polish on the grinder material

rubber bond

bond used on grinding wheel when a high operating speed is needed but with a considerable degree of flexibility is needed to resist side thrust. Used for snagging work in foundries and thin cutoff wheels

vitrified bond

bonds composed of clays and other ceramic substances, an abrasive is covered in wet clay so that each grain is coated. Put on a wheel for grinding

silicon carbide

ceramic material used as an abrasive

dressing

cleaning and sharpening a grinding wheel

hydrodynamic machining

cutting that uses a high-velocity fluid jet impinging on the workpiece to perform a slitting operation

water-jet cutting

cutting that uses a high-velocity fluid jet impinging on the workpiece to perform a slitting operation

water-jet machining

cutting that uses a high-velocity fluid jet impinging on the workpiece to perform a slitting operation

design for manufacturing (DFM)

designs that make manufacturing processes more efficient

truing

fixing a grinding wheel after it has lost its geometry due to use

disk grinder

grinding machines that have relatively large side-mounted abrasive disks

infeed

grinding method where the depth of cut is the wheel moving down onto the work piece

center-type cylindrical grinding

grinding that is used for producing external cylindrical surfaces

creep feed grinding (CFG)

method of grinding where the work is fed very slowly past the wheel and the total downed or depth is accomplished in a single pass

corundum

naturally occurring abrasive material like diamond

garnet

off-colored diamonds that are not suitable for gems

quartz

one of the only natural abrasives used today primarily in coated abrasives and air blasting

resinoid bond

phenolic resins. compounded plastics that can be used on a grinding wheel because of their degree of flexibility and ability to receive considerable abuse

chucking-type external grinding

rapid grinding process for relatively short parts such as ball-bearing races

cubic boron nitride (CBN)

synthetically produced combination of intensive heat and pressure in the presence of a catalyst. Super abrasive like diamond.

hardness

the ability to resist penetration

attrition

the abrasive wear action of the grits resulting in dulled edges, grit flattening and wheel glazing

cutting

the act of making a cut

plunge-cut grinding

the basic movement is the wheel being fed radially into the work while the latter reveals on centers

grade

the bond strength of grits that prevents fracturing

G ratio (grinding ratio)

the cubic inches of stock removed divided by the cubic inches of wheel lost

friability

the fracture of the grits and the opposite of toughness

diamond

the hardest of all materials, use off - colored stones that are not suitable for gems or synthetically created ones for abrasives

aluminum oxide

the most widely used artificial abrasive

grinding

the process where abrasives are bonded together into a wheel to use on a material

regulating wheel

the smaller of the two wheels when a piece is being grinded between two different wheels, it is mounted at an angle to the plane of the grinding wheel revolving at a much slower surface speed

silicate bond

use waterglass as the bonding material on grinding wheel. Used because it is brittle reducing the machining temperature

plowing

when a grit is pushed along the material forming a track behind it

rubbing

when a grit is pushed along the material smoothing out uneven surfaces

burn

when a workpiece becomes overheated during grinding and turns a bluish temper color