This is very straight forward, though I found the slots I made tended to wander due
to the flexibility of the slitting saw being used. I have therefore increased the
width on the drawings to minimise the problem for the viewer.
Also, with the experience gained, I have reduced the number of workpiece clamping
screws (H1)from four to two as I found the lower screws achieved very little, photograph
5 shows that I had included four.
Being so simple to make, slots excepted, I do not intend to go into detail but will
publish a couple of photographs. Photograph 3 show a tee nut being machined and whilst
I do not normally go into details of speed and feed rates the viewer may be interested.
The cut is 4.5mm deep by 9mm wide and is being taken with a relatively new cutter
20mm diameter running at about 350rpm and there seemed plenty in hand. Whilst not
very evident from the photograph the vice is one of the very cheap light weight drilling
vices that I have added a longer jaw and keep plate. When I am quizzed regarding
using such a light weight vice I point out that it is low slung, a definite advantage
both to the slides of the machine and to the vice itself, and equally important it
has four widely spaced fixings and inherits considerable strength from the table
Photograph 4 shows the jaws being counterbored using commercial counterbores but
for years I used my own versions made from silver steel. Whilst these worked reasonably
well the commercial cutters make the task very easy. If you do not have a suitable
counterbore do not under any circumstances attempt to get by just using a drill,
especially for these jaws where security on the machine table is of paramount importance.
Photograph 5 shows one of the two sets of jaws that I made.
A By Product
A feature of this set of jaws not originally envisaged is that if the double tapped
tee nuts are used with a jacking screw in one hole and a fixing stud in the other
they provide quit a simple method of securing small items to the worktable, Photograph