David P Best:
This is what a standard guide bushing/collar looks like.
David P Best:
The back side of a standard collar in the adapter
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Decided to prototype in Aluminum to start.
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Raw aluminum stock.
David P Best:
Maximum OD on the part is 35mm.
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Turning to maximum part OD
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Chamfering to make room for tool paths
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Second diameter is 30mm OK
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Turning that OD
David P Best:
Test fitting the two-step registration
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OD of the treads is 1-1/16, pitch is 20 TPI
David P Best:
Turning thread relief gullet
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Scratch pass with treading tool
David P Best:
After threading - the locking nut has a good fit
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Bringing the collar to size of 26.5mm
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Ready to part off.
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Drilling pilot hole
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After parting off.
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Rechucked and drilled to 17mm ID
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Rechucked again, drilling the threaded area to 25mm.
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Chewing off the metal.
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Chamfering the corners
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Finished prototype
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The prototype fits and is to spec
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First two attempts in SS failed during threading
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I also discovered just how razor sharp the swarf can be.
David P Best:
Final version - success on 3rd attempt
David P Best:
Final version
David P Best:
Final version
David P Best:
Final version
