An essential operation when milling is to lock the two slides that are not being
traversed during machining and is especially so when milling on the lathe due to
the light nature of the set up. Unfortunately, the position of the vice on the vertical
slide prevented access to the locking screws, the top and bottom gib strip screws
had therefore to be used, not idea, but essential. Next fit clamps on the slide ways,
just machined, and then remove the clamps initially fitted. This enabling both edges
of the base to be machined.
The next stage is to machine the surfaces on which the jaw slides. This is an example
of the problem of a limited size worktable. With a normal vertical mill the vice
could be stood on the table and held in place by a bar clamp at either end. the two
surfaces then be available for machining at the one go. This cannot be achieved on
the limited size of the vertical slide.
Place a piece of bar into the lower tee slot, as mentioned earlier, and rest the
vice on this to take the weight whist placing clamps to hold it in place as shown
in Photograph 4. This set up must be done with care to ensure that both sides of
the vice's base are firmly in contact with the vertical slide face. For this to be
achieved, the packing under the bar clamp must be a little higher than the vice portion
being clamped so that the clamping pressure is applied only at the clamps end. The
clamp must also be long enough so that pressure is applied close to the inner edge
of the upper jaw slide surface.
Take a very light cut over the lower surface, setting a saddle stop to this position
so that the other side can be machined at the same height. Having machined the one
face, remove, turn over, re-clamp and machine the second face, using the saddle stop
to ensure both are machined at the same level. Unfortunately,whilst the back end
of the saddle stop is shown in the photograph I failed to show the working end,sorry.
Do take the absolute minimum off as this operation lowers the jaw and therefore the
position of the hole in the moving jaw, miss aligning it with the tapped hole for
the feed screw. However, the screw in the tapped hole and the end in the moving jaw
had generous clearances so there was not a problem.
Mount the vice body on packing on the cross slide and mill the groves along the length
of the body on either side, Photograph 5. Make these 8 mm wide, 6 mm from the base
of the vice to the edge of the grove and 5 millimetre deep. However, the height of
the groove above the base is not critical as the clamps can be made to suit. There
is therefore some leeway on the height of the packing used.