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Fillet radius on turned shaft

Fillet radius on turned shaft

Fillet radius on turned shaft

(OP)
I have been asked to review a tension rod design for a safety catcher on a press.  Bascially the catcher is a rod that goes up and down through a cylindrycal braking mechanism.  The vendor is looking to attach the fixed end of the rod using a collar connection.  The rod will have to be turned down to receive the collar.  He is asking me to specify the radius at the edges of the turned portion.  I beleive that this is to reduce stress concentrations at these locations.  Does anyone have any idea of how to arrive at the appropriate radius?

Thanks,
Jim

RE: Fillet radius on turned shaft

As big as you can get without interfering with anything else like bearings or seals. In the case of radii bigger is better.

RE: Fillet radius on turned shaft

Look in Peterson's "Stress Concentration Factors"
Sometimes you can undercut/relieve the shoulder to get a bigger radius or use a compound radius for lower SCF's.

RE: Fillet radius on turned shaft

Whatever size you finally settle upon, it would be very useful to get the radius fillet rolled in order to get somme compressive stress into the radius. Go see your local boltmaker.

RE: Fillet radius on turned shaft

......OR shot peening the fillet radius and tangent points would achieve similar results.

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