crank machining begins

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crank machining begins

Post  littlemoon on Sun Oct 10, 2010 11:45 am

started on the crank today. skimmed the webs back by 2mm each side to accept the rd rod. i still need to machine back the area around where the big end goes. here are a few pics







here is a couple of pics of the frame stand. it was made from bits of scrap found in the workshop.



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Re: crank machining begins

Post  daz.h on Mon Oct 11, 2010 2:16 am

great in action shots simon, good to see the lathe is getting plenty of use Very Happy
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Re: crank machining begins

Post  Snails on Thu Oct 14, 2010 3:22 pm

Ooh scary. Nice stand though.
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more crank machining

Post  littlemoon on Sat Oct 16, 2010 2:50 pm

more crank tweeking. i recessed the crank near the big end to give better clearence for the rd rod.did the hard bit, big end faces using a cincinnati grinding machine. here a few pics













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does it fit ?

Post  littlemoon on Sat Oct 16, 2010 3:05 pm

in the last pic i have made and fitted a dummy crank big end pin, made from aluminium. the big question ...... does the crank and new rod fit in the starstream casing, well of course it wont fit. it just about squeezes into the casing but the big end rubs on the casing as the crank rotates. so to sort this i will be grinding a bit off the big end of the rod and machining out the casing (an 85mm hole saw should do the job). one step forwards two steps back.
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Re: crank machining begins

Post  daz.h on Sat Oct 16, 2010 3:30 pm

watch them casings, they are made of something just a bit stronger than spit and sawdust
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it fits

Post  littlemoon on Sun Nov 21, 2010 3:58 pm

littlemoon wrote:in the last pic i have made and fitted a dummy crank big end pin, made from aluminium. the big question ...... does the crank and new rod fit in the starstream casing, well of course it wont fit. it just about squeezes into the casing but the big end rubs on the casing as the crank rotates. so to sort this i will be grinding a bit off the big end of the rod and machining out the casing (an 85mm hole saw should do the job). one step forwards two steps back.

after a bit more grinding of the big end of the rod and taking some off arond the inside of the crank case the crank now rotates Cool .
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Re: crank machining begins

Post  daz.h on Sun Nov 21, 2010 4:07 pm

cheers yeah, well done simon, paving the way for us all to copy.
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Re: crank machining begins

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