Civil Engineering Reference
In-Depth Information
Fig. 7.8. Although these circular shims were turned on the lathe, the principle is the
same as milling square shims on the mill.
Parallels bolted down
You can make a nest on the machine table by bolting parallels down to the
table. Some parallels have holes through them so you can put bolts through
them while others will have to have clamps on them. Clock the parallels with
a dial test indicator if they need to be parallel to the table, or use a protractor
from the edge of the machine table if they have to be set on an angle. The
component can then be pushed into the corner made by the parallels and se-
cured with a clamp.
Cylindrical parallels or squares
Cylindrical parallels or squares are, as their name suggests, cylindrical in
shape with a flat turned face at exact right-angles to the upright side of the
diameter. You can bolt these parallels directly onto the machine's table by us-
ing a bolt right through them. They are useful for all sorts of machining, from
squaring up the ends of angle to machining angle plates, and you can also
clamp blocks to them if you need to square up something.
