Removing ball bearings from crank journals
#21
Most older cranks were done the same way as the 6 above. Especially the straight fours with only 3 main bearings. The old mini cooper cranks are cross drilled through the bearing journals requiring no plugs.
For a performance crank you don't want the oiling holes in the bearings on the outer ends. I think it's to do with the centrifugal forces pushing the oil only to the outer side of the bearing and it has to work against the rotation force to get to the top and side of the bearing where the load is on the upstroke. Something like that...
For a performance crank you don't want the oiling holes in the bearings on the outer ends. I think it's to do with the centrifugal forces pushing the oil only to the outer side of the bearing and it has to work against the rotation force to get to the top and side of the bearing where the load is on the upstroke. Something like that...
#29
???
I spoke to a machinist and he said he could use spark erroding machine to burn them out. He has a 4mm nozzle that would remove the bearings without much damage to the surrounding crank.
Apparently the entire crank gets put in a fluid bath and the nozzle sucks the fluid up through the center whilst the outer body arcs and melts whatever is infront of the nozzle. The molten metal gets extracted through the nozzle via the fluid.
I spoke to a machinist and he said he could use spark erroding machine to burn them out. He has a 4mm nozzle that would remove the bearings without much damage to the surrounding crank.
Apparently the entire crank gets put in a fluid bath and the nozzle sucks the fluid up through the center whilst the outer body arcs and melts whatever is infront of the nozzle. The molten metal gets extracted through the nozzle via the fluid.
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