Presentation Transcript
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
Catch the
buzz on authorSTREAM
Copyright © 2002-2008 authorSTREAM. All rights reserved.