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Harold Hall

Workshop Processes

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From this photograph it can be seen just how close the bottom of the milling machine quill was to the ends of the casting and why the cutter would have been inadequate for machining the vee as seen in photograph 5.

 

I have not mentioned the tapped holes in the main casting or the plain holes in the clamp but produced these at this late stage. Some workshop owners would I am sure have drilled then earlier and used them to fix the castings to the angle plate rather than using the methods I have illustrated. If you have a large enough angle plate then it is certainly a method worth considering providing the slots in the plate are suitably spaced, perhaps that is not very likely.

 

The clamp now being finished I was able to machine the ends of the main casting as was explained earlier and illustrate in photographs 7 and 8. You may though understandably consider this an unnecessary feature and chose to bypass this operation.

 

Having done that there just remained for the edges to be lightly chamfered and the non machined surfaces painted and we have the finished item, Photograph 12, that is unless I eventually chose to re-machine some of the faces as explained below.

 

At the time of producing this project I have not checked to see if there has been any movement within the casting as a result of the machining as this is best undertaken after a time delay of at least a few weeks. The only area that is important is that the two surfaces of the vee are at 90° to the main face, a situation that I will check using an engineers square. If I find an error in access of what I feel is reasonable I will set up a cylindrical square on the milling machine table and clamp the Keat's to this using its own clamp and with that done very lightly re-surface just the main face.

 

See also my item on machining a Vee Angle Plate

Keats Angle Plate
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12

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Drawings