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## Chapter: Mechanical : Metrology and Measurements : Thread Measurement This radius measurement requires the use of vernier caliper, C- Clamp, surface plate and two pins. This method is very much use in measuring the cap of bearing. Initially the job is fixed on surface plate with the help of C-clamp. So that the central position of the circular part is touch with the surface plate. Next the two balls are placed on both side of the work and using the vernier caliper readings are taken.

Let, R = Radius of job, I = The reading between two balls Here there are two methods

1.Edges are well defined.

2.Edges are rounded up

Edges are well defined In this method radius is calculated by using surface plate, height gauge, angle plate,C-clamp and slip gauges. First the Job placed on the surface plate and then by using depth micrometer the depth is measured and it is h. Next in such a way that cavity is resting against an angle plate and the part is clamped in this position. By using a height gauge edge to edge size of hole is measured and this is diameter of d.

When cavities are rounded up the radius is measured by depth micrometer

and slip gauges. First the width of the micrometer is measured by slip gauges and

it is   let   ‘   d’.   Then   it   is   placed   in   t

touches the base. From this condition the reading is noted and it be h and the

radius is measured by using the formula

2) Edges are rounded up

When cavities are rounded up the radius is measured by depth micrometer and slip gauges. First the width of the micrometer is measured by slip gauges and it is let ‘d’. Then placed in the cavity and measuring tip is lowered down to touches the base. From this condition the reading is noted and it be h and the radius is measured by using the formula Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
Mechanical : Metrology and Measurements : Thread Measurement : Radius Measurement |