Question

A square type machine bed of a vertical machining centre is inspected for flatness. Following readings are obtained at four corners: A, B, C and, D as 20.01, 20.00, 19.09 and, 20.02 mm. The reading at the mid-point I is 19.08 mm. Taking A, B, C as datum (0,0,0), find the deviations at D and M. What is the flatness error w.r.t ABC plane

Answer 1