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CNC

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by

Joe Mousey

on 23 October 2012

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Transcript of CNC

CNC Machines History - In 1942, machinist John T. Parsons was told that helicopters would be the next big thing. How it works: CNC Variations What CNC's
can actually make... (in a nutshell) - Seeking a job in the field, he was hired by an aircraft company to build wooden stringers on the rotor blades. Sikorsky Helicopter - Crafting wood by hand decreases consistency and increases attrition.

- 17 point template and French Curve still unreliable. - Parsons learns about Punch Card Calculators- essentially early versions of the computer- which were being used to make precise calculations by engineers.

- He then realized one could use them to mark 200 points rather than the 17 points he was otherwise limited to. - Clever concept, but he still lacked the funds to develop his plan.

- After learning the newly-formed Air Force was having trouble with jet designs, Parsons' contacted an uninterested Lockheed.

-They had just heavily invested in machines utilizing metal template cutting far less precise than Parsons'.
- Axes are either LINEAR (straight line and often labeled X/Y/Z) or rotary (circular path and often labeled A/B/C

- More axes = more complex machine drills holes in material clears out/hollows material drills/carves to create shapes allows symmetry of object by cutting/sanding material rotating on axis Magic
Flight
Grinders Furniture Instruments Signs
Helicopters

- In 1949, the Air Force dropped Lockheed and approached Parsons. Despite increased accuracy of 200 point cut, rough edges remain.

- Parsons then sought help from MIT who discovered that not merely cutting AT points A & B but instead moving BETWEEN them= smoother with less cutting points

- Deal struck between Parsons, Air Force, and MIT to construct 2 machines- prototype and production system- both to be handed to Parsons for immediate construction of stringers.

- Deal lasted from July 1949 to June of 1950 when MIT wrote a contract directly with the Air Force eliminating Parsons from the project. - 2 or more programmable directions of motion called 'axes' - User drafts digital design in computer software

- Software translates paths into 'G-Code'

- 'G-Code' tells machine precise movements, turns, and cuts to make
marries two pieces of metal material together
Drill Press: Lathes: Welders: Routers: Mills:
Full transcript