Machine tool vibration has and will be an issue in industry as long as shaping by means of physical material removal continues to be used. Developing a machine that can accommodate this natural vibration that occurs in the cutting process is a goal for every new machine design at the Gleason Works, Rochester. Knowing the vibration signature of a machine is very helpful in determining critical and non-critical cutter excitation frequencies. An analytical frequency analysis of simplified virtual models was completed to aid in the design process of the new Gleason GP130 Hobber. To determine the accuracy of these results, a production GP130 hobber hob column and hob head area was analyzed statically. Experimental mode shapes of the structure were extracted in a frequency range from 0 - 150 Hz and compared with analytical predictions. Correlation between the experimental and analytical sets of results is presented using the Modal Assurance Criterion. The frequency data found for the GP130 machine is used in determining whether various hob cutter tooling selections fall in a critical excitation range of the machine.

Library of Congress Subject Headings

Gear-cutting machines--Design and construction; Vibration--Mathematical models; Structural dynamics--Mathematical models; Modal analysis; Gleason Works (Rochester, N.Y.)

Publication Date


Document Type


Department, Program, or Center

Mechanical Engineering (KGCOE)


Kochersberger, Kevin

Advisor/Committee Member

Walter, Wayne

Advisor/Committee Member

Ghoneim, Hany


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