Re: Good high speed shaft material?
- From: F. George McDuffee <gmcduffee@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 28 Jul 2006 10:26:57 -0500
On Fri, 28 Jul 2006 04:40:26 GMT, no@xxxxxxxxxxxx (Terry Keeley)
wrote:
Making a shaft that will run 20K rpm in one of my R/C boats, it'll be================
1/4" diameter with a keyway and threads on one end to hold a
gear. I've had 2 break right at the end of some threads but will
eliminate them as a possible stress point.
My first was made of 416 stainless and didn't last long at all, the
next was 1144 "stress relieved" and did better but
eventually broke too. I need something that can be turned and not
warp and that is tough. A toolmaker buddy suggested 4140
"pre-heat treat", what's the thinking here?
You may be encountering "shaft whirl" which causes the shaft to
vibrate or flex like a plucked guitar string at certain rpms.
All steels are about equally "stiff" or resistant to bending
[although some are much more to take a permanent set or bend] so
switching materials if this is the case won't help. How long is
your shaft [l/d ratio is critical parameter here]. Can you
install an intermediate bearing? It won't have to handle much
load, just enough to keep the shaft from starting to bend/twang.
Unka George
(George McDuffee)
....and at the end of the fight is a tombstone white
with the name of the late deceased, and
the epitaph drear:
?A Fool lies here, who tried to hustle the East.?
Rudyard Kipling The Naulahka, ch. 5, heading (1892).
.
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