Machine Design
In block brakes, the ratio of shoe width to wheel diameter is taken between

0.1 and 0.25
0.50 and 0.75
0.25 and 0.50
0.75 and 1

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Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
0.625 t for both the straps on the inside and outside
0.75 t for both the straps on the inside and outside

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Machine Design
A bolt of M 24 × 2 means that

The nominal diameter of bolt is 24 mm and pitch is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm
The pitch of the thread is 24 mm and depth is 2 mm
Cross-sectional area of the threads is 24 mm²

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