Acturally we are trying to find out where the maximum von Misses for a combinded load case. For the pure shear, the max von Misses occurs at the neutral axis. For the pure bending, the max von Misses is located on the outter surface. We are wondering that if the max von Misses could be in...
Wow, This topic generates so many response. Thanks all.
Yes, for the maximum shear stress: it's correct, ?=(4P/3A)(R2+Rr+r2)/(R2+r2), for a hollow circular cross section and ?=2P/A for thin wall.
How about shear stress at any point? Do I have to use VQ/(It) as rb1957 said? Is there any...
Hello, everyone,
Is there anyone knows that the general formula to compute the shear stress at any point on the cross section of a hollow circular beam? Thanks.
I really don’t how far off the load is since we don’t have any testing data. The load estimation is my calculation based on horsepower and the lower end of the working rpm.
All our bearings are from NSK. Yes, I agree. Two bearings are good enough.
Tmoose, the spindle is horizontal.
For the normal working load, the radial reaction force at four-bearing assembly is not over 2000lb with 200HP and 2144 working rpm and without considering impact load. The axial load can be ignored. As regarding the induced load, it’s a tough part. Probably...
Yes, JJPellin, you are absolutely right. It’s my first time seeing that four bearings are put together, furthermore with different types.
Thank you for all you suggestions on seals. I’m seriously considering your third and fourth recommendations.
Sorry for the confusing. Yes, one picture is better than one-thousand words. I do have a sketch but I have trouble to post here. I don't have any website to link. Maybe I can email to someone here if you can provide your email address.
The problem area is that four-bearing group. Originally...
Thank you for your responses, Russell and Tmoose.
It’s a motorized spindle. The motor is connected with a coupler at the end having one pair of 6220. This grinder really has some problems. I’m doing the failure analysis on it. It’s failed about every 6-month. The bearing contamination is its...
Dear group, here is my question. Is that common that four bearings with different types are packed together?
It’s for a grinder spindle with a 200HP motor. The first bearing up front is 6222, with one N222 behind that. Then two 7222 are followed up. On the other side of spindle, there is one...
