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Harold Hall

Angle Plate, quick set with auxilary parts

Workshop Projects

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Rather than using a "Cylindrical Square" the method uses some square posts to mount the castings, a "Square Square" I suppose. Whilst theoretically not as accurate as the cylinder, providing the jaws of the four jaw chuck used when facing the end are in good condition then the result will be more than adequate. Even though I did not use the method I have rigged it up on the lathe for the benefit of the viewer, Photograph 9. If you wished to machine the end faces then it will be a case of using the cross or vertical slide, Hemingway do not mention this so appear to accept that the ends are left in the as cast state.

 

After the angle plate has been fully machined leave for a month of two and then return and repeat the machining operations by taking a light finishing cut. This will ensure that if the casting moved due to the initial machining that the final result will still be accurate. A similar operation should be undertaken with the faceplate also. If you wish to use the angle plate and faceplate in the intervening time there should no problem as any movement is likely to be very small.

 

The accessories

There are four accessories, with the material being supplied for these, added to this is one of my own as I will explain later. Photograph 10 shows the accessories together with the finished faceplate and angle plate.

 

Pillar Supports

These (square squares) are essential if using the method in Photograph 9 but even if the viewer uses the milling machine with an existing angle plate they are still worth making as they can often assist in mounting items on the faceplate, angle plate, vertical slide or the machine table, see Photographs 11 and 12 There is a 9/16" counter bore to take the head of the cap screw that secures the pillar but as such a large counterbore is unlikely to be available in the majority of workshops this must be made on the lathe as seen in Photograph 13.

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 9

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10

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13

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12

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11