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| Tolerancing a machined hex key (female hex) |
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| David Jupp:
A female duplicate of the shape to act as a driver will tend to try to drive 'on the corners', leading to damage. It is also difficult to machine the corners 'sharp' - probably broached when making sockets commercially. Taking a leaf out of 'flank drive' sockets and spanners, and perhaps also to minimise fit problems, you might want to think about relieving the corners of the driver slightly, a slight recess at each corner. |
| bry1975:
Thanks Chaps, I've sent a rough drawing to the NEW CNC shop I've found and will take it from there, so do you reckon having the corners rounded with a tiny slot drill would be oks? Also I know when I wanted to design some bicycle crank levers I always thought the squared taper was broached as would be difficult to make any other way. Bry |
| bry1975:
Thanks chaps, And from the drawing above the 12 sided polygon is practically round so the tool really is going to want to try and round the edges! :( |
| andyf:
Bry, can't you specify that a small hole be drilled centred on each corner before the dodecagon is milled out, to make sure the corners aren't left rounded so much that they interfere with the corners on the case back. . Ned, thanks; I'm sure you are right to correct me. Andy |
| bry1975:
I will Andy I'll have a good word with the CNC machinists. Thanks. |
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