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The Standard MiniMill™

Room 3-470 77 Massachusetts Ave. Cambridge, MA 02139. Phone: (617) 253-1953 Fax: (617) 258-6427 http://pergatory.mit.edu/. The Standard MiniMill™. A small milling machine using ball screws and linear rails. By: Roger Cortesi rcortesi@mit.edu http://pergatory.mit.edu/rcortesi/.

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The Standard MiniMill™

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  1. Room 3-470 77 Massachusetts Ave. Cambridge, MA 02139 Phone: (617) 253-1953 Fax: (617) 258-6427 http://pergatory.mit.edu/ The Standard MiniMill™ A small milling machine using ball screws and linear rails By: Roger Cortesi rcortesi@mit.edu http://pergatory.mit.edu/rcortesi/ Precision Engineering Research Group Massachusetts Institute of Technology, Mechanical Engineering Department

  2. The Standard MiniMill™An Alternate to the original MiniMill™ By Roger Cortesi MIT Mechanical Engineering Precision Engineering Research Group 27 FEB 00

  3. The Modified MiniMill™ • Is the original machine design. It uses linear motors for motive power and air bearings for the linear guides. • The Standard MiniMill™ • This machine is the same as the modified machine , but the motive power is provided by ball screws. Ball Rails are the linear guides. • The transition from the traditional technology in The Standard MiniMill™ to the technology in The Modified MiniMill™ can be done incrementally!!! • I.E. it is very easy to have a machine that is: • Powered by Ball Screws • Guided by Air Bearings • or • Powered by Linear Motor • Guided by Ball Rails

  4. Why The Standard MiniMill™ Using the traditional motive components (ball screws and ball rails) is less of a market risk than the linear motors and air bearing version of the MiniMill™.

  5. The Standard MiniMill™ Features • The same structural “L” shapes are used by both the Standard and Modified MiniMill™s. • The same “L” mold can be used for either machine. Only the threaded insert patterns are different.

  6. The Structural “L” for the Standard and Modified MiniMill™s The Standard MiniMill™ The Modified MiniMill™

  7. More Standard MiniMill™ Features • All three axis use identical ball screws, ball nuts and ball rails for cost savings. • Depending on the customer’s accuracy and price constraints, position sensing on the standard MiniMill™ can be done by a rotary encoder on the motor or a linear position encoder on the carriages.

  8. Design Issues Still In Progress • Axis motor selection • Currently Maxon™ Motor is the most likely. • Stiffness estimates for the Standard MiniMill™ • The Standard MiniMill™ should be much stiffer than the Modified MiniMill™ • Determine required accuracy grades on ball screw and linear rails and trucks • Type and mounting locations for limit switches • Type and mounting locations and type for bumpers • Mounting hardware and locations for cable carriers

  9. Parts to Order From Star Linear™

  10. A View of the Standard MiniMill™’s X Axis Motor Mounted Here Details TBD Linear Position Encoder Not Shown

  11. 15mm Rails Motor Mounted Here Details TBD Floating Pillow Block Ball Nut Optional Linear Position Encoder Fixed Pillow Block 12x5 Ball Screw A View of the Standard MiniMill™’s Y Axis

  12. Z Trucks (4) Y Ball Nut Mounting Point for Optional Linear Encoder Z Ball Nut X Trucks (4) Y Trucks (4) The New X and Y Carriages Obviously the X and Y Carriage from the Modified MiniMill™ wouldn’t work so here are the new ones X Carriage Y Carriage

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