Have you ever wondered what a Shimano Hollowtech crank looks like cut in half?
MidlandTrailquestsGraham – Member
I want to know how they make them now.
I think that oldnick has it. I believe that they are cold forged in a multi stage process from an aluminium tube. Then machined to produce the splines, pedal threads etc.
woody2000 – I had stuffed the pedal threads and, rather than using a HeliCoil, I replaced it with this: (Granted it looks a bit weird with one side XT and the other SLX but it works.)Posted 4 years ago
I reckon it’s worth polishing up the cut faces and getting some close up shots, I want to see the grain structure and if there’s any indication of how the material behaved when formed in different areas, it’s a pretty complex form for forging .
I’ve got a pair of 170mm hones with a frigged Driveside pedal thread I think, I was also going ot look at helicoiling that, but now I’m tempted to cut up the driveside arm for a look… Hmmm.
Anyone want the Non-drive arm if I do chop it up?Posted 4 years ago
Over the weekend, to satisfy my curiosity, I cut a Shimano Hollowtech crank in half. This is what it looks like (please excuse my lack of skill with a hacksaw):
Shimano XT Hollowtech II Crank by eddkh, on Flickr
For reference it is a Shimano Deore XT M760 non-drive side crank, 170mm long. If anyone desperately wants it I could send it for the cost of postage.Posted 4 years ago
stumpy01 – Member
How ‘flat’ is the cut or is it wibbly wobbly?!
I cut from each end so where I “met” in the middle isn’t that pretty.
cookeaa – Member
I reckon it’s worth polishing up the cut faces and getting some close up shots, I want to see the grain structure and if there’s any indication of how the material behaved when formed in different areas, it’s a pretty complex form for forging.
You’re welcome to have a go (and I would be very interested to see the results) but I’ll leave it for someone else to do.
beefheart – Member
Do you have any XTRs you can cut in half?
I’m not made of money. 😉Posted 4 years ago
I thought as much when I inspected my XT, though I suspected they’d use some sort of ‘weld’ to stop folk having a prod about.
Thanks for clarifying…
If your XT is the M785 then the caliper is identical to the SLX above (except painted a different colour and with those magic letters ‘XT’). There’s nothing other than two bolts holding the two halves together. The long bolt in the picture goes through the top hole (in the top picture), and the banjo bolt which attaches the hose to the caliper goes through the bottom one. The banjo bolt has the ‘O’ ring pictured to seal the two halves (note the recess for it), but the top one doesn’t even need that as there’s no oil around it.
Very simple to take apart, just make sure you force the pistons out as far as you can while its still attached to the lever, as they’re a bu@@er to get out otherwise (learnt the hard way 😳 ) Re-assembly is even easier, but needs a good bleed to get air out of the small oil passages drilled through the caliper body (see bottom picture – the passage on the left goes to the bleed nipple, and the one on the right to the banjo bolt).Posted 4 years ago
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