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Post  mitchg95 on Sun Dec 30, 2012 1:55 am

does anyone know where i can get sealed bearings that have an inside diameter of .217''? thanks
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Post  Jason_WI on Sun Dec 30, 2012 3:54 am

I think you will have to grind the cranks down to 5mm or .1968 inches.
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Post  mitchg95 on Sun Dec 30, 2012 3:55 am

Jason_WI wrote:I think you will have to grind the cranks down to 5mm or .1968 inches.

would it be possible to turn them down?
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Post  Jason_WI on Sun Dec 30, 2012 5:12 am

Turn them down with carbide tooling then finish grind to size with a tool post grinder.
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Post  mitchg95 on Sun Dec 30, 2012 6:28 am

Jason_WI wrote:Turn them down with carbide tooling then finish grind to size with a tool post grinder.

i mean, how do i hold the work in the collet, i can hold it by the first raised section before the knurl, but how would i hold the crankshaft when i want to turn down the rear thickest part of the shaft?
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Post  pkrankow on Sun Dec 30, 2012 4:07 pm

I would use my 4-jaw to hold the crank end, and a live center on the prop end. Then it is about 30 minutes of fiddle faddle with an indicator to get it centered. If I did this more often than next to never it probably would be quicker.

I would use my angle grinder on a tool post and take very light cuts to dimension. I don't have carbide tooling.

Yea, there ain't much space and such between the headstock and tailstock to do this, even less with the grinder taking up space. I have an old Atlas 10F without a whole lot of tooling.

Phil
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Post  ahrma_581 on Sun Dec 30, 2012 11:00 pm

Might try Boca Bearings: http://www.bocabearings.com/bearing-applications/rc-engine/bearings

They have a 'Dimension' search.
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Post  John Goddard on Mon Dec 31, 2012 7:52 am

You must have bearing suppliers over there
Mitch.
If you're struggling I think the Ofna range
Of cars have imperial sizes.
Very Happy
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