Quote:
Originally Posted by Joe Johnson
Bill Beatty and I agree (I can't find the thread but trust me, he does) on this point -- a simple beam bending stress calculation is a more appropriate estimate for FIRST gear teeth.
Joe J. |
As Joe is eluding to, the cycle count and service life are quite low for FRC robots.
Last year 217 saw around 100 matches. At 2:15 minutes per match, it is less than 4 hours of runtime. Even at the 4500 rpm (cim speed) this is only 10^6 cycles. This is relatively low in terms of most design lifes, but within the fatigue regime of design. Really though the initial stage is seeing the lower torques. With a 50:1 or more, you are now down to 2x10^4 cycles. This is down within the infant death for most powertrain systems.
Thus I tend to agree with Dr. Joe that design so that the teeth do not yield, and you should be good to go.
Hmmm. maybe a simple set of equations would be good for this and helpful to the community.
IKE