Page 129 - Turner 1st sem Practicals

Bring the point of the tool bit in unit it just removes the
chalk or layout dye.
Turn the carriage hand wheel by hand to feed the cutting
tool slowly into the shoulder.
Apply a cutting fluid to assist the cutting action and to
produce a good surface finish.
Machine the bevelled shoulder until it is to the required
size.
If the size of the shoulder is large, and chatter occurs
when cutting with the side of the tool bit, it may be
necessary to cut the bevelled shoulder using the compound
rest.
Make sure that the tool bit is set up with the point close to Se the compound rest to the desired angle. (Fig 5)
the work, and with a slight space along the side cutting
edge.
Apply chalk or layout dye to the small diameter, as close
to the shoulder as possible.

Before starting the lathe, the tool bit should be brought
fairly close to the diameter, by using a piece of paper or
thin stock between the tool bit point and the work diameter.

Start the lathe and bring the facing tool in until it just
removes the chalk.
Note the reading on the graduated collar of the cross-slide
screw.
Bring the tool bit towards the shoulder with the carriage
hand wheel until a cut is started.
Face the shoulder by turning the cross-slide handle anti- Adjust the tool bit so that only the point will cut.
clockwise thus, cutting from the centre to the outside.
Apply a cutting fluid to assist cutting action. Progressively
For successive cuts, return the cross-slide screw to the machine the bevel. Always cut outwards and start each
same graduated collar setting. Repeat the above procedure cut near the outermost edge of the face of the shoulder.
until the shoulder is machined to the correct length.
Be careful not to damage the small diameter when
Machining a bevelled shoulder (Fig 4) preparing to make each new cut. At the start of the final
Lay out the position of the shoulder along the length of the cut, bring the point of the tool bit in, until it just removes
workpiece. the chalk or layout dye at the innermost edge of the original
shoulder face.
Rough and finish turn the small diameter to size.
Machining a filleted shoulder
Mount a side cutting tool in the tool-holder and set it to
centre. Lay out or mark the location of the shoulder on the
workpiece.
Apply chalk or layout dye to the small diameter as close
as possible to the shoulder location.
116 Producltion & Manufacturing : Turner - Exercise 1.3.37