"Making" an 8mm front hub q/r axle?
07-11-15, 06:15 AM
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"Making" an 8mm front hub q/r axle?
Hi,
I have an oddball wheel which uses an M8 threaded rod as an axle through cartridge bearings.
And while it works fine, it bugs me, as the rear uses a q/r axle.
Now, a normal front axle thread is 9x1 mm. And as far as I remember from Engineering class, it's the core diameter of a threaded element that's used for strength calculations.
So, assuming the machining is accurate enough, taking a threaded axle and shaving off 0.5 mm of the radius should still leave the axle safe to use in my 8mm internal diameter cartridge bearing hub?
I have an oddball wheel which uses an M8 threaded rod as an axle through cartridge bearings.
And while it works fine, it bugs me, as the rear uses a q/r axle.
Now, a normal front axle thread is 9x1 mm. And as far as I remember from Engineering class, it's the core diameter of a threaded element that's used for strength calculations.
So, assuming the machining is accurate enough, taking a threaded axle and shaving off 0.5 mm of the radius should still leave the axle safe to use in my 8mm internal diameter cartridge bearing hub?
07-11-15, 07:50 AM
#2
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take a little off the extreme ends of the outside of the 9 axle, or make the dropout a 9 with a round file.
or press out the 8 ID Bearings and substitute one with a 9 ID?
or press out the 8 ID Bearings and substitute one with a 9 ID?
07-11-15, 08:04 AM
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Bearing seat diameter in hub makes replacement with a bearing with bigger ID and the same OD impossible.
07-11-15, 08:20 AM
#4
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You looked at any industrial (not just bike) bearing suppliers stocklists?
why not just use a Different Hub ? regular 9mm ?
or stay with A solid 8 axle and Nuts or
Brompton fork Is an 8 they also use Shimano and SON dynohubs
that are a tubular Thru Skewer fitted Axle .
your 'engineering' is just book learning? never machined anything?
why not just use a Different Hub ? regular 9mm ?
or stay with A solid 8 axle and Nuts or
Brompton fork Is an 8 they also use Shimano and SON dynohubs
that are a tubular Thru Skewer fitted Axle .
your 'engineering' is just book learning? never machined anything?
Last edited by fietsbob; 07-11-15 at 08:28 AM.
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