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Old 11-25-2015, 10:57 AM
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Jim.Thompson
 
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Originally Posted by ZAGNUT
with the amount of beef there i wouldn't worry about not having a chamfer. if you were necking the hub down in the center and using something nasty like 7075 then it would start being important.
That is what I thought. This is large hunk of machined aluminium.
i like the idea with the reverse prop spigot. a "bald" prop washer would be interesting.
Bald prop washer? What is that?
and what size of hex and thread is the crank nut that it needs such a huge socket?
The thread is 10 mm. The nut that fits it is 17 mm. The 17mm socket that fits the nut is 25 mm diameter. Just under actually, probably 24. 8 mm or so. Hence the 25 mm counterbore.

The drilling guide will look something like the attached drawing.
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