Flashcards
L#17 Milling
Cards in this deck (14)
- 1What are the three principal forms of milling? Draw diagrams for each of these (3)1. Peripheral milling
2. Face milling
3. End milling
See notes for diagrams - 2What is the alternative name for peripheral milling? When is this name used (2)Slab milling (1) when the cutter is longer than the width of the work-piece being cut (1)
- 3What are the characteristics of peripheral milling? (3)1. The rotation axis of the cutter is parallel to the surface of the work-piece
2. The cutter body, generally made of high-speed steel, has a number of teeth along its circumference
3. Each tooth acts as a single point cutting tool - 4What are the two sub-categories for peripheral milling? (2)1. Conventional milling
2. Climb milling - 5What classifies the type of peripheral milling that is being used? (1)The direction of rotation of the cutter in relation to the feeding motion of the work-piece (1)
- 6Describe conventional milling (4)1. The maximum chip thickness is at the end of the cut as the tooth leaves the surface of the work-piece
2. This means the the contamination (or oxide layer) on the work surface does not affect the cutting process.
3. However, a dull cutter would rub against and smear the surface fro some distance before it begins to cut
4. Also there might be some tendency for the tool to chatter and the work-piece be pulled upwards (Necessitating good clamping) - 7Draw a diagram categorizing conventional and climb milling (3)See notes
- 8Draw diagrams to categorize a. parameters in slab milling b. schematic of the cutter travel distanceSee notes
- 9Describe climb milling (4)1. The cutter starts at the surface of the work-piece where the chip is thickest.
2. The cutting force here keeps the part in place.
3. However, because of the impact forces when the teeth engage the wrokpiece a rigid work-holding setup is required.
4. Climb milling is not suitable for machining work-pieces having surface scale, such as hot worked metals, forgings and castings. The scale is hard and abrasive and causes excessive wear and shortens service life - 10Draw the table for peripheral milling showing parameter, definition, unit and formula.See notes
- 11Draw an annotated diagram showing face-milling (4 stages)See notes
- 12Draw a summarizing table for face milling, giving parameter, definition, unit and fromulaeSee notes
- 13Describe end milling (6)1. An important and common machining operation
2. Because of its versatility and capability to produce various profiles and curved surfaces.
3. End mills are produced in various shapes to allow production of:
flat bottomed cavities and complex profiles around the workpiece (4)
sculptured surfaces and contours (ball nose and nose cutters (5)
Internal and external chamfers (chamfer end mills) (6) - 14Draw diagrams for the four types of end mills (4)See notes
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- Manufacturing Operations and Technology Flashcards on L#17 Milling, created by Block on 30/03/2014.
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- Block
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