From your answers, I should apply some solutions...
-inner shaft will be lighter with decreasing diameter between bearings. Or machine shaft to cross shape between bearings? will this be effect worst fatigue life in the future??
-Is there a good choice to apply heat treatment to get harder...
Yes, you are right.
Center shaft doesn't rotate.Center Shaft only for fixing and bearings mounted on it. This was done because I have limited hollow shaft material/tube (Length & Diameter is limited per my design so that I should use inner shaft for unbalance and fix). I can not change design...
Thanks AlephZero,
What is your advice to increase this critical speed to 90-95 Hz without new production. Because i want to run the hollow shaft with half of the critical speed, and this will be 2500x2=5000 RPM. But above 4000 RPM will be enough. Where and which sizes can l add mass to the...
I want to figure out critical speed of hollow shaft. When I calculate from equation, critical speed of this shaft is approximately 10000 RPM. But when I start to increase speed of shaft, at ~2500 RPM I see that the critical speed occured. What can I do to increase this critical speed to double...