EDMM 1500 - Exam 4 Questions with Correct Answers Latest Update 2025/2026

EDMM 1500 - Exam 4 Questions with Correct Answers Latest Update 2025/2026 TURNING & MILLING Chipmaking Processes - Answers Definition - Material removal by relative motion between a tool and a workpiece Chipmaking - Advantages - Answers Close dimensional tolerances Hardened materials can be machined Flexible with regard to geometry and materials Special surfaces quite feasible Tooling universal Small lot runs not cost prohibitive Chipmaking - Disadvantages - Answers Slow More energy intensive than forming or shaping Material waste usually exceeds 30% Surface quality and integrity adversely affected Independent Variables in Chipmaking - Answers Tool material and its hardness Tool shape, surface finish and edge sharpness Workpiece material, hardness V = Cutting Speed d = Depth of cut Use of a cutting fluid Dependent Variables in Chipmaking - Answers - Type of chip produced - Force required to push tool into workpiece - Energy required from the machine tool - Temperature rise in the chip, tool and workpiece - Surface finish of workpiece - Surface integrity of workpiece Idealized Model of Turning - Answers Cutting Time, t = l / f N Where: t is time in min. l is length of cut in inches f is feed in inches/rev. N is RPM (rev. per min.) Cutting Tool Definitions - Turning - Answers Depth of Cut - d Distance tool is set to cut into the workpiece (inches) Feed, or Feed Rate - f Distance tool traverses per revolution of workpiece (inches per rev) Rotational Speed - N Revolutions per min of workpiece, RPM Cutting Speed - V Velocity of outside diameter of workpiece, always in feet per min, or fpm. Mechanics of Chip Formation - Answers - Chips are produced by a shearing process along the shear plane - Chips are always thicker than the depth of cut - As the rake angle decreases, or friction increases between the tool and chip, chips become thicker and hotter, energy required increases. Chuck - Answers TURNING - Engine Lathe - Answers knurling - Answers knurling is a finishing process used to create any combination of horizontal, vertical or crossing lines on the surface of a workpiece. For example, if a manufacturing company wants to add a diamond-patterned texture to a product — or a component of a product — it may use knurling. Knurling can be performed either by hand or by machine, both of which allow for the creation of a textured surface Bed - Answers The bed is a large horizontal structure or beam that's used to support other parts of a lathe like the headstock and tailstock Headstock - Answers Found on the end of the bed is the headstock. Once clamped to the end, the headstock provides the rotational power for the lathe's operations Tailstock - Answers Located opposite the headstock on a CNC machine lathe, tailstocks are used to secure and support the free end of a workpiece while it is being machined carriage - Answers The carriage is responsible for guiding the tool bit as it cuts or otherwise manipulates the workpiece. Apron - Answers The apron is a part of a lathe that's clamped to the saddle cutting speed - Answers formula