Terry Keeley
Titanium
- Joined
- Oct 18, 2005
- Location
- Toronto, Canada eh!
Trying to figure out a safe rpm limit for a steel flywheel 6" diameter x 1" thick. I'll turn it from solid so the shaft and wheel are one piece.
Machinery's Handbook (27th Edition) has a formula on pg. 191 in the "Mechanics & Strengths of Materials" section called "Safe Speed Formulas for Flywheels and Pulleys". This says a max of about 17K but it only shows steel with 60 ksi tensile strength and doesn't give the safety factor. I'm planning to use 4340 which is around 160 ksi. I'm hoping to turn it to 30K briefly for use in a small inertial dyno.
Any material engineers here? Anyone point me to some more detailed information?
Machinery's Handbook (27th Edition) has a formula on pg. 191 in the "Mechanics & Strengths of Materials" section called "Safe Speed Formulas for Flywheels and Pulleys". This says a max of about 17K but it only shows steel with 60 ksi tensile strength and doesn't give the safety factor. I'm planning to use 4340 which is around 160 ksi. I'm hoping to turn it to 30K briefly for use in a small inertial dyno.
Any material engineers here? Anyone point me to some more detailed information?