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Post by acceleration on Mar 7, 2022 12:57:52 GMT -5
Looks great Randy .005 should work OK. A lot of the time and effort involved in building these cranks is in getting it straight after it is assembled. And some of them can be really difficult to get straight. All of the cranks we have done come out "under" .001
And some of them require a lot time and effort to get it there. Recently built a 750 crank and welded the crank and having a balance scale, balanced the connecting rods rods too. We almost always weld the cranks on Yamaha RD/RZ . A couple of miss shifts and clutch slips burying the tach will really throw these cranks out of balance. Especially on the Yamaha's. Looks like you have been pretty busy Randy . I am assuming you have been working on your 72 H2 project ? Hopefully they will have the vintage bike show this summer in Ormstown. After a couple of years covid cancellations. Hope to see you there if they have it this year.
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Post by lc on Mar 7, 2022 13:52:39 GMT -5
acceleration,
Randy quotes .0005 and less (note the extra zero in the decimal reading).
In other words his crank is true to 1/2 thou or less.
J
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Post by acceleration on Mar 7, 2022 19:53:54 GMT -5
Yes nice job. I didn't have time to look at all the pictures. Glad Randy posted them. You can see all the work he did.
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Post by triplecraze on Mar 8, 2022 20:29:45 GMT -5
I must admit I’m very happy to attempt my first crank build for my triple. A great deal of credit goes to Scott (LC) for his guidance and continued support . It was in conversation last fall that scott suggested I build my own crank . With my machining background I have the ability to machine jig fixtures for this task . Scott has guided and instructed me in order to make this a success .Thank you Scott. My next crank build will have Aluminium Lab seals .
Randy
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Post by triplecraze on Mar 9, 2022 20:51:34 GMT -5
Looks great! I wonder what percentage of crank rebuilds are due to those steel cages exploding? I went with polyamide cages on my last rebuild for this reason. Hey Andrew. I wondered the same regarding steel cages exploding on these cranks. For that reason I chose polymide cages as well . I feel a trued crank property secured in the cases with loctite will help minimize bearing failure . I must admit I’ve been guilty of miss shifts and I’m thinking this is very difficult on the bearings . |
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Post by triplecraze on Mar 10, 2022 15:24:48 GMT -5
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Post by Walms on Mar 11, 2022 8:39:17 GMT -5
Yes, I've had my fair share of miss shifts too!
😬
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Post by zambia on Mar 11, 2022 17:13:10 GMT -5
Yes, I've had my fair share of miss shifts too! 😬 Me too! But mostly on your bike - because the shifter is backwards..  |
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Post by pipe welder on Mar 13, 2022 14:18:46 GMT -5
Great video. That must have been a lot of work and time to get it so close. Excellent work and I’m sure it was a great learning experience.
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Post by triplecraze on Mar 14, 2022 12:25:54 GMT -5
Great video. That must have been a lot of work and time to get it so close. Excellent work and I’m sure it was a great learning experience. Hello Jim I have to agree my first crank took time to build.. . The journey began with sourcing a good useable hydraulic press. After finding the press I had to machine tooling to make assembly and trueing more friendly. I did practice a build on a non serviceable rusty crank first. This allowed me practice and time to test my tooling. I had lots of great help from a local board member who made this a great learning experience . For me patience is very important . |
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pk
2nd Gear
Posts: 77
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Post by pk on Jun 1, 2022 17:14:27 GMT -5
Great video. That must have been a lot of work and time to get it so close. Excellent work and I’m sure it was a great learning experience. Hello Jim I have to agree my first crank took time to build.. . The journey began with sourcing a good useable hydraulic press. After finding the press I had to machine tooling to make assembly and trueing more friendly. I did practice a build on a non serviceable rusty crank first. This allowed me practice and time to test my tooling. I had lots of great help from a local board member who made this a great learning experience . For me patience is very important . As you know I had the same experience last summer. It's very rewarding. Took me 3 months to make the tooling and 3 days to rebuild my first crank. I have 10 000 km on it now. PK  |
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