Question

A turning operation in the automotive industry relates to the reduction of the
diameter of bar stock by 6 mm for about 100,000 components. For a constant
machining cycle time, would you recommend a single-pass operation or a
multi-pass operation, from the point of view of tool life and surface finish?
Why?

Answer 1

Reducing diameter by 6 mm which meand

depth of cut =6/2=3 mm

So turning to reduce 3 mm thickness is not difficult but this may harm both the too ( as the tool life is inversaly related to depth of cut) and at the same time it also affects surface finish of the turned surface. Butat the same time there are 100,000 component in line to be turned going for multi-pass operation may take time .

But since component quality is most important and also the tool cost is more than the labour cost .if tool fractures , then it involves other activities like

>Removing the tool,

>Regrinding the tool.

And replacing it againg .

So these activities takes both time and money .this may increase operation cost significantly if tool fails very rapidly due to high depth of cut.

So it is adviceabl to go for multi-pass pass operation.