On Fri, 27 Feb 2009 22:15:31 -0500, Ned Simmons
wrote:
snip
Axial loads != thrust loads.
Huh?? Can you explain the distinction, please?
Should have wrote radial load...
Ok...go to imaginary land......
Below is a bearing
__
| | |
| | | radial or axial load
| | |
|_| |
V
Thrust load---------
The bearing is designed to carry a load at a right angle to the
rotation of the bearing (radial/axial load).
Where are you getting this? Radial and axial load *are not* the same
thing; thrust and axial load *are* the same.
You are big on web pages.
Try this:
http://science.howstuffworks.com/bearing2.htm
snip
*****************************
Regarding the effect of clearance on thrust carrying capability,
Fafnir says, "Internal clearance is sometimes utilized to compensate
for thermal expansion of bearings, shafts, and housings or to provide
a contact angle in the bearing after mounting."
The guys is having *extreme* thrust loads.
The thrust loads are causing the bearing to fail.
Using a single row ball bearing to accommodate any significant thrust
loads that displace the inner and outer rings in relation to each
other more than half the amount of specified internal clearance is not
good practice.
Similarly, Barden says, "Proper internal clearance will provide a
suitable contact angle to support thrust loads or to meet exacting
requirements on elastic yield."
Ya know...I could get into hoop strength, compression loads in the
load zone, etc. etc. and it has nothing to do with the problem cited.
The bearings are failing due to the simple fact that they cannot
accommodate the thrust loads involved in the application.
But...you have to be right...and I am wrong.
I would suggest you read a very informative book by Tedric Harris.
You won...have fun with the last word too...be creative with it.
--
K. A. Cannon
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