In grinding wheel following abrasives are used
The natural abrasives are emery and corrundum,These are impure forms of aluminium oxide.
Artificial abrasives are silicon carbide and aluminium oxide.
In grinding wheel following abrasives are used
The natural abrasives are emery and corrundum,These are impure forms of aluminium oxide.
Artificial abrasives are silicon carbide and aluminium oxide.
Spot facing is a machining operation for producing a flat seat for bolt head, washer or nut at the opening of a drilled hole. The tool is called a spot facer or a spot facing tool. Spot facing is similar to counter-boring, except that it is shallower. Tools that are used for counter-boring can be used for spot facing as well.
The point angle of a general purpose (standard) drill is 118°. This is the angle between the cutting edges (lips). The angle varies according to the hardness of the material to be drilled.