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Harold Hall

Workshop Projects

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Drawings

The major difference is with there being two clamping screws on each jaw making it possible to tilt the jaw face. Once one becomes aware of this the difficulty that results is minimal and can work to one's advantage in some cases and in any case mainly applies to set ups as seen in photograph 20. The way to proceed with round items is to first use just the clamp screw furthest from the body face and set the workpiece to run true adjacent to jaws. With that done the outer end can then be set true by using the inner clamp screws which is really an advantage as with the conventional chuck one would have to accept just what resulted, with this set-up both ends can be set true.

 

Plus points.

Can use a mix of jaws and workpiece clamps

Has deeper jaws than a comparable sized chuck, *35mm compared to 20mm

With the jaws still within the perimeter of the body it takes much larger diameters than a comparable sized chuck, *83mm compared to 58mm

Total projection from the lathe's mandrel mounting surface is less, *65mm compared to 73mm

Much more adaptable for complex shaped workpieces

With the clamping screws having a much finer pitch clamping pressure is much more easily applied.

Reversing the jaws, which is a slow process, is not required.

Much easier to keep the mechanisms clean

Can be used without the jaws as a very adaptable faceplate.

 

*Comparisons are with my 6" four jaw chuck.

 

Worthwhile?

If the viewer makes much use of the four jaw and faceplate then this alternative form will provide some useful additional capabilities. Whilst for the viewer who has yet to acquire a four jaw chuck then it is an option worth considering, saving money, and also providing an interesting project.