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Harold Hall

Workshop Projects

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A Two Piece Milling Machine Vice, an alternative
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 3

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 4

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 5

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 6

Manufacture

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 itself.

 

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 6.