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Crank bearing mount

Trunch Trojan

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Arthur Goodwin19/08/2020 15:33:19
41 forum posts
18 photos

Hi all

Have made the upper/lower bearing mounts from MS.

I now need to bore/ream to take the bronze bush. My q is, not having a jig borer what is the best way to machine the mating pairs so they are aligned with each other when assembled on their support pillars.

Thanks in advance.


JasonB19/08/2020 16:06:25
19556 forum posts
2142 photos
1 articles

I think I would join the top and bottom halves with the two 5BA fixings while laid on their sides on a flat surface so they stay lined up. Then mount the them in the mill vice with the bottom bearing against the fixed jaw (previously clocked true) and a packing piece between the two 5BA fixings so the moving jaw can bear on the cap, you will probably need to raise teh work off the vice base with parallels.

Drill and bore the first then use a stop set against one end so that when you put teh second assemble into the vice you can locate it in the same position.

This sort of thing

Arthur Goodwin20/08/2020 17:56:38
41 forum posts
18 photos

Bearing mountHi Jason

Thanks for your info , it worked a treat.

Just got one more bearing to make and I am ready for a test build before tackling the offset crank (aargh)

Many thanks Art

Edited By Arthur Goodwin on 20/08/2020 18:02:32

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