State the principle used in Lapping. List four applications of Lapping.

State the principle used in Lapping. List four applications of Lapping.
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1 Answer

Answer :

Principle of Lapping: Lapping is basically an abrasive process in which loose abrasives function as cutting points finding momentary support of the lap.


The process has the following features.

(a) Use of loose abrasives between the lap and the work

(b) The lap and workpiece are not positively driven, but are guided in contact with each other

(c) Relative motion between the lap and work surface should be constantly changing. The effective path is of cycloid in nature.


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Applications:

A. Hand lapping is used for

i. Press work dies

ii. Moulding dies

iii. Limit gauges

iv. Surface plates

v. Engine valve and valve seat

B. Machine lapping is used for

i. Races of ball and roller bearings

ii. Gears

iii. Piston rings

iv. Slip gauges

v. Crankshaft.

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