From 2.008 class notes, SP03 Surface Finish From 2.008 class notes, SP03 Tips & Tricks
For high precision, watch out for Overhanging geometry (deflection) Thin sections & tubes (vibration) Drilling incline planes For ease of manufacturing
Standard shape & size holes Proper tolerances (discussed tomorrow) Reference everything off one point
Avoid deep pockets & holes NO inside right edges! WATCH OUT for tool access! a short endmill used inside a deep narrow pocket might CRASH!) Dont cut into the vise or clamps! Mill: Part in Vise
To make it faster (& less annoying) Minimize number of fixtures Every time you take the part out of the vise you have to re-reference it wastes time! Include features for easy fixturing & referencing
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Process Planning TOMORROW Look for departmental resources
Machine shop resources Buy material Make material correct size
From 2.008 Process Planning lecture, SP03 Detailed Process Planning for Manufacturing Choose material and order it Make material correct starting size/shape Watch for tolerances when ordering parts arent always exact size or perfectly square
Plan what cuts/features to make first, second, third based on complexity, yield of process, etc. - SKETCH If something is likely to not work, dont do that step last! Detailed Process Planning for
Manufacturing, Continued Determine when to check for quality/accuracy in the process Easier to measure twice and cut once than the other way around! For any hand-machining operations, mark the parts in an OBVIOUS way!
ei, an X on the part that you dont want, scribble where you want material removed Optimizing your Process Plan Fewer steps = better Make a flowchart How Its Made Examples
Resources Machinerys Handbook
Manufacturing textbooks (Kalpakjian) Your local machinist MIT shops MIT departmental shops Edgerton Student Shop (on Vassar Street) MIT Hobby Shop
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