# standard minimill stiffness

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Published on February 28, 2008

Author: luie

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The Standard MiniMill™ Stiffness Calculations:  The Standard MiniMill™ Stiffness Calculations Precision Engineering Research Group Massachusetts Institute of Technology, Mechanical Engineering Department By: Roger Cortesi rcortesi@mit.edu http://pergatory.mit.edu/rcortesi/ Types of Stiffness Calculations:  Types of Stiffness Calculations Ball Screw Stiffness Servo Stiffness Carriage Translation Stiffness Carriage Roll Stiffness Standard MiniMill™ Ball Screw Stiffness:  Standard MiniMill™ Ball Screw Stiffness Standard MiniMill™ Servo Stiffness:  Standard MiniMill™ Servo Stiffness Standard MiniMill™ Carriage Translation Stiffness:  Standard MiniMill™ Carriage Translation Stiffness The carriage stiffness in the UP DOWN and SIDE directions in 4 times the truck stiffness in each of these directions. Standard MiniMill™ Carriage Roll Stiffness:  Standard MiniMill™ Carriage Roll Stiffness Carriage Stiffness Comparison Between The Standard and Modified MiniMill™:  Carriage Stiffness Comparison Between The Standard and Modified MiniMill™ Axial Stiffness 1 is the servo stiffness. Use if a linear encoder is used Axial Stiffness 2 is the stiffness of the ball screw, use if a rotary encoder is used See the Modified MiniMill™ Stiffness Presentation for the calculation of the its stiffness values Overall Machine Stiffness Estimates Between The Standard and Modified MiniMill™:  Overall Machine Stiffness Estimates Between The Standard and Modified MiniMill™ The Modified MiniMill™ has an estimated Machine Stiffness of: 5 N/micron (27,000 lbf/inch) The Standard MiniMill™ has an estimated Machine Stiffness of: 10 N/micron (57,000 lbf/inch) This can be doubled by upgrading from short trucks (0.02 C Preload) to Standard Trucks (0.08 C Preload) The machine stiffness was estimated from the deflection due to the rolling of Y Carriage and Deflection of the Z Axis. See the Modified MiniMill™ Stiffness Presentation for the calculation of the its stiffness values

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June 26, 2017

June 26, 2017

June 26, 2017

June 26, 2017

June 26, 2017

June 26, 2017

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