upper deviation is zero
A basic shaft is one whose Upper deviation is zero
Upper Deviation: It is the algebraic difference between the maximum size and the basic size. The upper deviation of a hole is represented by a symbol ES and of a shaft, it is represented by es.
Lower Deviation: It is the algebraic difference between the minimum size and the basic size.
Lapping
Lapping is a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine. Lapping process gives best surface finish.
24 square centimeter
Area of a triangle having side 6cm, 8cm and 10 cm is 24 square centimeter
Control shape and position
Geometric tolerance is provided to control shape and position
18.84
Circular Pitch Circular pitch is the distance measured along the circumference of the pitch circle from a point on one tooth to a corresponding point on the adjacent tooth. It is denoted by p.
Circular Pitch = p = (PixD)/T
where
Pi = 3.141
Pitch Circle Diameter = D = 240 mm
Number of Gear teeth = T = 40
= (3.141x240)/40
p=18.84
