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Harold Hall

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Jaw keep plate

Now make the jaw keep plate but drilling it initially with tapping size holes, see drawing. Clamp this to the jaw making sure it is central across the width and with 20mm projecting at the front.  Drill through the keep plate into the jaw with tapping size holes, tap the holes in the jaw and open up those in the keep plate to clearance size. However, there is not a lot of room for the clamp so it will be a case of drill one hole, fit a second clamp, remove the first clamp and drill the second hole.

 

Next stage is to establish the required fit of the jaw and keep plate into the main body of the vice. The method is simple and consists of fixing a file in the gap where the keep plate slides, placing the jaw into the groove and move it back and forth until jaw and body have almost the same dimension.

 

Assemble the jaw with keep plate onto the vice body but place a thin shim, or piece of copper wire, between the keep plate and vice body so that the jaw is firmly fixed. Mount the assembly onto the vertical slide using a single fixing through the centre of the vice. Make sure that the clamp plate is firmly against the jaw to give it added security. Machine the top face of the jaw and then a light finishing skim over both ends and the jaw to bring them level.

 

Again, mount the angle plate onto the vertical slide but this time horizontally and mount the vice on this as shown by Photograph 10 and machine the edges of the vice fixing web. This edge does though need to be at right angles to the face of the vice against which the workpiece will be clamped. As the end face is parallel to the working face, this can be achieved using an engineers square, Photograph 11.   

 

Having machined the first side turn round with the machined edge now against the slide and machine the other. I do hope you have taken my repeated advice and set the vertical slide face parallel to the cross slide movement.

 

For the next operation it is essential that the slide is upright and that the tee slots are perfectly horizontal else the vice sides will not be at right angles to the jaw face, but the slide should always be set this way, unless needed otherwise. Once more place the locating bar into a tee slot and use this to position the assembly for fixing to the slide, as illustrated in Photograph 12.

 

The locating bar, as well as supporting, also is an aid to repeatability where a part has to be removed and rotated for machining on the reverse side, as it does in this case.

Metalworking

Workshop Projects

Milling on the Lathe
Milling on the Lathe
Milling on the Lathe
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10

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11

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12