Machine Drawing

100 Machine Drawing

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D

10 D

2.5 D

7.5 D

D

1.67 D 0.67 D

Key

Fig. 5.39 Lewis foundation bolt

This type of foundation bolt is not commonly used for fixing machines. However, the

principle is advantageously used for lifting huge stones. For this, a groove, similar to the

pit is chiselled in the stone and the bolt is fitted in. The top end of the bolt may be forged

into an eye and used for lifting purposes.

5.11.5 Cotter Foundation Bolt

It is used for fixing heavy machines. It has a rectangular slot at its bottom end, to receive a

cotter. For putting the bolts in position, the foundation bed is first made, providing holes

for inserting cotters. Figure 5.40 shows a cotter foundation bolt in position. A cast iron

washer (W) placed as shown, provides bearing surface for the cotter (C).

1.5 D

0.4 D

DD 0.4D 0.5D1.2D 0.4D

1.2 D

THICK 0.25 D

Hand Hole

W

CC

3D

D

Fig. 5.40 Cotter foundation bolt