Civil Engineering Reference
In-Depth Information
Method 2
Another method is to machine the block a face at a time. Put the block into the
vice and machine the largest flat face to clean up. Place this face against the
fixed vice with the longest edge showing. Clamp using a round bar between
the moving vice and the work-piece. Machine the edge that is showing so it
cleans up. We now have two faces square to each other.
Flip the block over, first face still against the fixed jaw, second machined
face down in the vice. Tighten the vice up, still using the round bar, and ma-
chine the side to finished width. Now we have three machined faces square
and parallel. Put the workpiece into the vice, on parallels and machine the
fourth face flat, true, parallel and to size.
There are several ways to machine the two remaining end faces. The first
is to put the workpiece in the vice with one end hanging outside the vice. You
can now machine the full depth of the end face with an end mill. Turn the
workpiece round so the other end of the workpiece is hanging out of the vice
and machine to finished length.
Fig. 6.8 The sequence for cleaning up a square bar: Mill the first face square. Put this
machined face against the fixed jaw and machine the next face square. Turn the
workpiece over and machine the third face square. Remove the round bar and ma-
chine the last face square.
