Assembly Drawings 289
dharm
d:\N-Design\Des18-2.pm5
reciprocating ram of the shaper. The vertical slide 1 is fitted to the back plate through the guide-
ways and it is positioned on the screw 3 by means of sleeve 5 and the handle 4. When the screw is
operated, the vertical slide moves along with the screw. As the slide is rigidly fixed to the screw
and permitted to slip, when the screw is rotated, the slide is restricted to have only reciprocating
movement. By rotating the back plate about a horizontal axis, the slide can be made to traverse at
any desired angle to the vertical, for shaping inclined surfaces. The swivel plate (Fig. 18.16) is
pivoted to the slide by the swivel pin 6 and clamped at the desired position by the clamping
screw 7.
Exercise
The details of a shaper tool head slide are shown in Fig. 18.17. Using a suitable scale, draw,
(i) view from the front and (ii) sectional view from the right.
18.3.5 Lathe Tail-stock
It is a part of a lathe machine and is used to support lengthy jobs. To accommodate works of
different lengths between centres, the tail-stock may be moved on the lathe bed to the required
position and clamped by means of a clamping bolt.
Figure 18.18 shows various parts of a tail-stock. The barrel 2 is fitted into the bore of the
tail-stock body 1 and is prevented from rotation by the feather key 9 placed underneath of it. The
barrel has a threaded portion at its end and the spindle 3 is inserted into the barrel through this.
The hand wheel 6 is mounted on the spindle by a key and is retained in position by a nut. The
spindle bearing 5 is placed between the hand wheel and the tail-stock body. A tapered hole provided
at the front end of the barrel, receives the dead centre 4 or a tapered shank of the drill or reamer.
When the hand wheel is operated, the barrel is made to move in or out of the tail-stock
body. In the required position of the barrel, clamping may be made by means of the clamping
lever 7 and stud 8 which is fitted to the tail-stock body. The spindle bearing is fixed to the body by
means of the screws 10.
Exercise
Figure 18.18 shows the details of a lathe tail-stock. Assemble the parts and draw to a suitable
scale, (i) sectional view from the front and (ii) view from the left.
18.3.6 Milling Machine Tail-stock
Jobs requiring milling operations in relation to their axes of rotation, are usually supported
between the centres of the dividing head and adjustable centre provided in the tail-stock. The
parts of a milling machine tail-stock are shown in Fig. 18.19. This is similar to the lathe tail-
stock.
The screw 4 is introduced into the threaded hole of body 1. Centre 2 is inserted into the
body such that, the hole provided in it enters onto the screw 4. Hand wheel 3 is mounted on the
screw 4, by using the key 8 and fixed in position by using washer 6 and nut 7.
By operating the hand wheel, the centre can be given the required movement/fine
adjustment, while clamping the job between the centres. After adjustment, the centre can be
locked by the screw 5, which is introduced into the body, prior to the location of the centre in the
body. Figure 19.11 shows the assembly drawing.
Exercise
Assemble the parts of the milling machine tail-stock, shown in Fig. 18.19 and draw, (i) sectional
view from the front and (ii) view from the right.
