I need to make a precision flywheel with OD 1.9" ID 0.25" x 0.375"
I've made one, but my arbor broke as I took it apart. First using a 2" round I turned, faced, and drilled, bored the center hole. Then cut it off. Made an arbor to slip fit the center hole, made a 10-24 tapped hole in the end of the arbor. With a marker, I marked one of the chuck jaws and the arbor where they meet, this way I can reuse the arbor, and it will be alined within 0.5 thou at least, because the shank of the arbor is not precise. I put the workpiece faced side first in the arbor, and clamped it in place with a 10-24 screw, so I could face the rough side. The problem is I made the arbor out of aluminum, and the tapped hole had a very thin wall around, so when I took it apart that section of the arbor broke off. I'm wondering if there's a easier way, and if I should use 1018 or 4140 for the arbor, or would a smaller screw clamp hard enough? The flywheel material is aluminum. I've tried making a very slightly tapered arbor, but when I press fit to the workpiece, it bends.