Turning machine

Although my goal is only aimed for the grinding machine but my this blog will touch on the turning machine as the lesson of the grinding machine had ended.

This week we learned the structures and the functions of turning machine which was teached by Mr Tay. As other people told me, once started the lesson, he introduced many formulae. First was the cutting speed(v), which depends on the material of the work piece and the cutting tool being used. If the material of the work piece was soft, for example, plastic, and the cutting tool was diamond, which is the hardest substance in the world, the cutting speed need to be increased and vice versa.

Next was the spindle speed(n). Spindle is the wheel that clamps the work piece while cutting. Its formula is
n=(1000v)/(π x d)
where v =cutting speed
d=diameter of the work piece
There are differences in calculating the diameter for different process although the work pieces may are of the same dimensions.
For facing,
d=d' x(2/3)
For side cutting,
d=d'
where d'=original of the diameter of the work piece

And finally was the feedrate, which is the speed of x-axis and z-axis moving when they are set into automatic mode. These two axes can be moved manually or automatically. To determine this feedrate, we need to refer to the turning machine manual which lists all the feedrates for different work pieces and tools or sometimes to save time, Mr Tay will tell us. The speed of the feedrate can affect the surface of the workpiece. The slower the feedrate, the flatter the finishing of the work piece's surface.

These were all told by Mr Tay this week and the week after common test, we will have to start to use the turning machine on our own.