Manufacturing Science, Machine Tools & CIM
From transcript: 20ME350A Manufacturing Science (C) · 20ME540 Machine Tools & Operations (C) · 20ME36L Workshop (A) · 20ME37L Machine Shop (A) · 20ME57L CIM and CNC Lab (S) · 20ME646 Computer Integrated Manufacturing (C)
Cheat sheet
Formulas
Definitions
- Orthogonal cutting
- 2D model: rake α, shear φ, friction β
- Tool signature
- ASA/ORS angles — rake, relief, inclination
- Machinability
- Ease of cutting — tool life, forces, finish, chips
- CNC
- Computer numerical control of machine axes
- CIM
- Computer integrated manufacturing — linked design/plan/produce
- FMS
- Flexible manufacturing system — CNC + handling + control
- Group technology
- Part families for cellular layout
- Additive manufacturing
- Layer-wise build — DfAM constraints
- Casting yield
- Casting mass / (casting+feeders) mass
- HAZ
- Heat affected zone in welding — property change
- Primary processes
- Casting, forming, machining, joining, additive
- Jig vs fixture
- Jig guides tool; fixture holds work
Topic-wise short notes
Cutting theory & machine tools
- Lathe, mill, drill, grinder — primary motion vs feed.
- Single-point vs multi-point tools; insert grades (carbide coatings).
- Grinding: finish & hard materials; specific energy high.
- Nontraditional: EDM, ECM, LBM, WJM — for hard/fragile/complex.
- Metrology loop: measure → correct offsets on CNC.
CNC & CIM
- Absolute vs incremental; work offsets G54…; tool length comp.
- Canned cycles drilling/pocketing — less code, more parameters.
- CAD→CAM→post-processor→G-code chain; verify with simulation.
- Industry 4.0: sensors, traceability, closed-loop quality.
Machining
- Oblique cutting adds inclination — chip flow sideways.
- Economics: tooling cost vs time — optimum speed not always max.
Casting & welding quick notes
- Pattern allowances: shrinkage, draft, machining.
- Gating/risering: feed solidification shrinkage.
- Weld defects: porosity, undercut, incomplete fusion, cracks — NDT.
Metal forming
- Forging vs rolling vs extrusion — grain flow & strength.
- Springback in sheet bending — overbend/compensate.
- Deep drawing LDR limits; wrinkling vs fracture.
Exam traps & quick notes
- Process capability Cp/Cpk for quality interviews.
- CNC lab S grade — speak to G-code, offsets, toolpaths confidently.
- Fleurette: jigs + auto stitch ≈40% labour / ≈25% cycle — classic SMED/standard work.
- Chip types: continuous, discontinuous, built-up edge — finish impact.
- Coolant: life, finish, dimensional stability — also cost/environment.
- Select process by volume, tolerance, material, geometry complexity.
- Taylor n depends on tool-work; C is for 1 min life reference often.
- CIM ≠ only CNC — includes CAPP, ERP/MES data flow.
Comprehensive notes
Cutting theory & machine tools
Orthogonal cutting, tool geometry, lathe/mill/drill ops, grinding; selection of speeds/feeds.
External: NPTEL Manufacturing Processes ↗ Sandvik machining guides ↗
CNC & CIM
Axis conventions, canned cycles, tool compensation, DNC, FMS cells, ERP link to shop floor.
Metal cutting & machine tools
Merchant shear plane idea; tool angles; Taylor tool life VT^n=C; speeds/feeds; turning/milling/drilling/grinding roles.
External: NPTEL ↗ Engineering Toolbox ↗
CNC & CIM
G/M codes, work/tool offsets, canned cycles, verification. CIM links CAD/CAM, planning, quality data, ERP — direction of Fleurette shop connectivity.
External: NPTEL ↗ Engineering Toolbox ↗
DFM, jigs, quality
Design for process capability; jig vs fixture; Cp/Cpk; poka-yoke. Fleurette: jigs + auto stitch → ~40% labour / ~25% cycle.
External: NPTEL ↗ Engineering Toolbox ↗
Interview Q&A for this subject
Q: G00 vs G01?
A: G00 rapid (non-cutting), G01 linear feed move.
External: ASQ / quality ↗ MIT OCW ↗