Civil Engineering Reference
In-Depth Information
Fig. 7.13 A sine bar consists of a length of bar with two exact size disks mounted on
it at known centres.
Sine bar
You can also use a sine bar in the vice to set work on an angle. You will need
to refer to trigonometry tables to set up the sine bar. This is not difficult to do.
Assuming your sine bar is 5in long (the 5 inches will be from the centre of one
circular end to the centre of the other circular end) you just need to multiply
the sine of the angle required by the length of the sine bar and that gives you
the size of packing you need under the sine bar. You do not need a set of ex-
pensive slip gauges to use as packing - just make up the required thickness
with pieces of bar and shim, or turn a piece of round bar to the required dia-
meter.
Tilting vices
Tilting vices, mentioned earlier, are usually used for light drilling work on the
drilling machine but there is no reason why you could not use one for light
milling on the mill.
Adjustable angle plates
This type of angle plate can twist from 0 degrees, when the moving face is
horizontal to the machine's table, right round to 90 degrees. The angle plate
can be set to any angle between 0 and 90 degrees and locked in place. This
type of angle plate is usually big enough to have a small machine vice moun-
ted on top of it.
