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Doing up a bike for the eldest and, as I'm not making the frame this time, I thought it might be nice to make some cranks.
Will try and work out sizes/offsets etc from an existing crank.
Anyone else done it?
I wonder if you can get a forged 'blank' of suitable size, or would billet just do the job?
I've horrible memories of US made billet cranks that were made to look nice and hit a target weight.
Actually looking forward to seeing where this thread ends up.... 🙂
It's only for a 7yr old so no major problems with strength so billet should suffice. We've got some nice 7075 aluminium in the stores I can use..
Modern day versions of these...
If I was to use a Hollowtech 2 bottom bracket is the length of the spindle (between the 2 inner faces of the crank) critical?
I was thinking of having a bit of adjustment in the non-drive-side position..
If I had all the time in the world and your obvious skill set and access to macine time, I'd have 'tried' to come up with a tube based crank like these ciamillo cranks where the end is able to slide up and down and secured by pinch bolts allowing some growing room.
I would imagine that the critical size is the length of the spline in the case of HT2 (and even that probably no better than +/-0.5mm. The rest can be tweaked with spacers, can't it?
Are you thinking of a full billet driveside crank and spindle, or a separate steel spindle permanently fitted to the drive crank?
Watching with interest, I enjoyed the balance bike thread. Stuff like this makes me miss my machining days!
That's a bit posh Bearback, bit out of my league.
Bull, thinking billet arms a steel axle