Question

Find the spindle size, optimum span of bearings (Lo), deflection (δ),and stiffness, if the spindle overhang (A) is 100 and the spindle made from spheroidal graphite cast iron with outside and inside diameter of 82 and 60 mm with steady load bending moment. The cutting force at the overhung end is 180 kg. Powered by a 12 kW motor, the spindle runs in a 50-500 R.P.M. range. Use a roller bearing near the overhung end, and a ball bearing at the farther end. (δq = 0.000157, δP. = 0.00055/kg).

.

Find stiffness of a fabricated C.I. table 1200×1200 for a machine tool. Knowing that, the area of the ribs is 2800 mm2

Answer 1