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How can I calculate the maximum safe RPM of a spinning disk?
I am building a dynomometer and I want to use aluminum rotors of 6061 T6. I would like to calculate the max safe RPM and also the bursting speed of the rotors. I know that similar rotors of 12inc diameter will go to 9000rpm safely.I am using 6inch rotors and want much higher speed. They will have pockets and vanes machined into them, but the solid disk speed should be sufficient. Anyone have the equation?
1 Answer
- LeAnneLv 71 decade agoFavorite Answer
All of the mathematical calculations in the world won't give you the real world, SAFE maximum RPM of a spinning disk - only actual testing can do this. The discs will vary as will the balance and internal integrity of the material itself - real world testing and monitoring of the RPM necessary to cause numerous different disks to fracture and fail (and spew shrapnel in all directions), average the RPM's and multiply this figure by 0.5 for maximum safety or 0.75 for a reasonable margin of safety.
If you use manufactured disks, the manufacturer has already done the work for you and the maximum safe RPM's will be clearly marked on the disks or provided with a specification sheet.