Machining slender crankshafts

[Bob RodgersonParticipant @bobrodgerson97362]

A long time back I machined the crankshaft for a 360 cc flat six.

In order to minimise deflection and chatter while machining the various journals I filled the gaps between the webs of previously machined journals with polyester resin by masking off most of the gap and leaving just a small hole through which the resin is poured. When finished drop the crank into a tank of Acetone to dissolve the resin.

[Bob RodgersonParticipant @bobrodgerson97362]

How to reduce deflection while machining the journals of long slender crankshafts

[Michael GilliganParticipant @michaelgilligan61133]

Neat idea, Bob

Thanks

MichaelG.

[Steve WithnellParticipant @stevewithnell34426]

For the crank for the Whittle V8, I made some slotted tubes to slip over the crank and used jubilee clips to tighten them up.

Like this:

**LINK**

Steve

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