Page 194 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

EXERCISE 9 : Detail Drawing and Assembly Drawing

Assembly view of bearings

Foot step Bearing

Footstep or pivot bearing is used to support vertical shaft ends for axial loads. A gunmetal bush having collar on
top is placed inside a cast iron body called sole. Inside the bush, a gunmetal disc is placed to support the end of
the shaft. Fig 1 shows the part details. A snug is provided on the sole between the bush and the disc in order to
prevent the rotation of them. Note that the shaft end has a convex surface and the disc has a matching concave
surface to support. The bush and the block are recessed to reduce the machining length of the bush and to result
better fitting. The hollow collar portion of the bush provides a slot around the shaft to admit lubricating oil.
The body has to be drawn first and then the bush and disc are placed in position. Locate the snug and place the
shaft to complete the thin line drawing. After removing the unnecessary lines, convert the thin lines to visible and
hidden lines. Write the dimensions and hatch the sectioned areas to complete the views.

Fig 1

Practice : Assemble and draw the part drawing of a foot step bearing shown in Fig 2.
1 Front view with right half in section

2 Top view

181
CITS :Engineering Drawing (Mechanical) - Exercise 8