Re: Good high speed shaft material?
- From: dnichols@xxxxxxxxxxx (DoN. Nichols)
- Date: 29 Jul 2006 02:01:28 GMT
According to Terry Keeley <no@xxxxxxxxxxxx>:
Thanks again guys, looks like I'll go with "heat treat-stress
proof" 4140, or "normalized" as it's described in the
Machinery's Handbook. This material has a tensile strength of
148,000 and yeild strength of 95,000 whereas the 1144 I used before
is rated at 96,750 & 58,000 respectively.
The big help should be the elimination of the threads on the end that
keeps breaking, I'm goin to fix the collet to the shaft with
set-screws instead. If this set-up breaks I'll have to go with a
bigger shaft...
With setscrews, you will have a bit more difficulty balancing
the shaft -- but I'll bet that the keyway introduced enough of an
imbalance at the speeds which you mentioned.
If you *must* have a keyway -- can you cut *two* of them at 180
degrees -- and use two keys as well -- to maintain the balance?
And another thing which *might* improve your reliability with the
threaded end of the shaft. Look into having the threads rolled, instead
of cut. This makes for a more rounded root of the thread, and the
rolling process makes for greater strength beyond that of the stress
riser problem.
Good Luck,
DoN.
--
Email: <dnichols@xxxxxxxxxxx> | Voice (all times): (703) 938-4564
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