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Drilling

Drilling. Drills produces deep holes. Drilling machine. Insert drill. Max drill. Drill. Drill: http://www.youtube.com/watch?v=ul20R32HJ3E. Drill: http://ma.gnu.ac.kr/vod/Machining/Drill.MP4. Tapping. Tap produces thread inside the hold. Tap Feed Rate = RPM x Pitch

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Drilling

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  1. Drilling • Drills produces deep holes. Drilling machine Insert drill Max drill Drill Drill: http://www.youtube.com/watch?v=ul20R32HJ3E Drill: http://ma.gnu.ac.kr/vod/Machining/Drill.MP4

  2. Tapping • Tap produces thread inside the hold. • Tap Feed Rate = RPM x Pitch Ex) M6 x 1 at 2000 RPM = 2000 mm/min Tapping Tapping holder and tool http://www.youtube.com/watch?v=vCHQLFZHHJc

  3. Reaming, Boring • Reamer enlarges an hole to the diameter of the tool. • Boring produce precise circular internal profiles. Reaming Boring Drilling, Tapping, Boring: http://vimeo.com/8642433 http://www.youtube.com/user/GlacernMachineTools#p/u/0/om6GQKfoS1g

  4. Planer and Shaper

  5. Gear Hobbing • A hob (cutter) is rotated one revolution to transfer each tooth profile onto a rotating gear blank. • Used very often for medium to high sizes of production runs.  http://www.youtube.com/watch?v=DwFssm9trSc

  6. Broaching • Linear broaching: the broach is run linearly against a surface of the workpiece to effect the cut. • Rotary broaching: the broach is rotated and pressed into the workpiece to cut an axis symmetric shape. Broaching gear: http://www.youtube.com/watch?v=2K45B6tDqsg&p=9B6D9EAE75875D9D Rotary broaching: http://www.youtube.com/watch?v=gUEcagEmmZo&p=9B6D9EAE75875D9D

  7. Design for milling • Minimize machining, use casting and forging. • Minimize the length to diameter ratio of the tools. • Design features to be machined from one side.

  8. Design for milling • The inside edges must have the radius of the end mill. • For outside corners, chamfers are preferable over fillet. • For flatness, bosses should be used. Ⓒ http://www.efunda.com/processes/machining/mill_design.cfm

  9. Economics of Machining Total cost per piece consists of four items: Cost Machining Total Setting up Tool Cutting speed

  10. References: Machine Tool Makers • www.doosaninfracore.co.kr • www.wia.co.kr • www.hwacheon.co.kr • www.mazak.jp (Japan) • www.haascnc.com (USA) • www.deckelmaho.com (EU)

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