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Nuovo Record to Pista Crank Advice

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Nuovo Record to Pista Crank Advice

Old 09-21-18, 07:55 AM
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xetaprime
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Nuovo Record to Pista Crank Advice

Good morning! So I'm hacking away at a NR Crank for a track project. 2 down 3 to go. My question is do you think I need to sink the bolt nut? And if so has anyone done it without a machine shop? I know not recessing it I defeat the purpose of removing the rails to some degree... I have a Foredom and Dremel. The aluminum if pretty soft- maybe hand turning an oversized drill bit? Ideas welcome.



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Old 09-21-18, 09:02 AM
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fietsbob 
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got a file card, too
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Old 09-21-18, 02:02 PM
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JohnDThompson 
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Originally Posted by xetaprime View Post
My question is do you think I need to sink the bolt nut? And if so has anyone done it without a machine shop? I know not recessing it I defeat the purpose of removing the rails to some degree.
You'll need a 12mm counterbore bit with a 10mm pilot, and accurate fixturing to do a decent job. It looks cool to have the nuts flush with the crank, but it's not strictly necessary as long as the nuts clear the chainstay.
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Old 09-21-18, 03:42 PM
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xetaprime
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Thanks for the tip. They do look cool flush with the crank. Those bores aint cheap. Hmmm...

hmmm... D'Ohhh!
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Old 09-21-18, 03:46 PM
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The chainrings are counterbored , on the outside
Q: why does it matter if the back side of the crank arm is?
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Old 09-21-18, 03:50 PM
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It doesn't right? Only if there are clearance issues. And they generally come that way No? ?
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