Will a 0.40 grind remove the fillet radius entirely from an a plus crank?
Turbo Mini Forums

The 0.20 grind on the big ends has cut into the fillet radius, creating an ideal place for a crack to start.

If it won't clean up with a 0.40 grind, I'll probably just bin it rather than spending money crack testing. It's a nice fully worked crank, so a shame to just throw away.

Cheers

James

I suppose it all depends on how much of the rad is left at the moment. 10thou a side isn't a lot to leave a decent rad.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Probably displaying my ignorance again, but should the fillet radius not be re-formed if the crank is ground properly ?

The radius has either been rolled off centre from the factory, or the crank has been ground off centre, meaning some radius has been cleaned up, some rolling remains and the transition makes a big stress point.. Will get a photo.

Edited by minimole23 on 19th Feb, 2014.

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1/4mile in 13.2sec @ 111 terminal on 15psi

imo have it done but have it nitrided
you must weigh up the costs ?

I'm going to get it crack tested, then stick it under the bed. Can always regrind to cooper s big ends if I ever use it again.

Give MED a call they may be able to help

Jawd

If there were anyone I'd talk to about grinding cranks, I'd talk to Simon at SMMC. I'm not sure where you are located but even send it to him from Norway.