ME 317 Day 2 Economics of Process Selection –Cost Factors –Fixed vs. Variable costs –Direct vs. Indirect costs Characterization of Part Geometry –Metrology –Tolerances –Surface Finish

Cost Factor Comparison (From Bralla)

Costs (21 st Century Manufacturing, Wright)

Product Design and Development, Ulrich and Eppinger

Dial Caliper engine2/en2-29.htm engine2/en2-29.htm

Micrometer

The Ra parameter measures average roughness. It is not sensitive to occasional spikes and gouges. On the other hand, the Rmax parameter is designed to detect these anomalies. The two surfaces shown here have nearly identical Ra values but very different Rmax values. Surface Finish

Instructions for “wringing” gage blocks d_tools/gage_blocks.htm Gage Blocks

Good info (including prices) on small inspection gages Ring Gages

Coordinate Measuring Machine