MIT2_72s09_lec13

MIT2_72s09_lec13 - MIT OpenCourseWare http:/ocw.mit.edu...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
MIT OpenCourseWare http://ocw.mit.edu 2.72 Elements of Mechanical Design Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2.72 Elements of Mechanical Design Lecture 1 3 : Gear failure prevention
Background image of page 2
Schedule and reading assignment Quiz ± Activity at end: Optional/Extra credit Images removed due to copyright restrictions. Please see images of very large and very small gears, such as: Topics http://mems.sandia.gov/gallery/images_gears_and_transmissions.html http://www.cage-gear.com/large_gear_cutting.htm ± Gear lifetime/selection Reading assignment ± None! © Martin Culpepper, All rights reserved 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Selection vs. design of gears It is rare to custom DESIGN a gear. Many gear selection programs… Anybody can read S/M and plug in #s BASIC considerations to select gears: ± Ensure geometric compatibility (e.g. equal pitch and same type) ± Avoid low-cycle failure (e.g. root stress) ± Avoid high-cycle failure (e.g. pitting) Focus on what is important © Martin Culpepper, All rights reserved 3
Background image of page 4
A failure… © Martin Culpepper, All rights reserved 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
How to model the gear teeth… © Martin Culpepper, All rights reserved 5 t x a W r W W t r f l F W t t l Figure by MIT OpenCourseWare. Figure by MIT OpenCourseWare.
Background image of page 6
Gear manufacturing
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Gear manufacturing - Hobbing © Martin Culpepper, All rights reserved Please see digtos. "GEAR HOBBING M20/32 CITIZEN CINCOM." February 17, 2008. YouTube. Accessed October 26, 2009. http://www.youtube.com/watch?v=fR2duvm3lPo 7
Background image of page 8
Gear manufacturing - Shaping © Martin Culpepper, All rights reserved Please see rolvon. "Gear Cutting." May 16, 2008. YouTube. Accessed October 26, 2009. http://www.youtube.com/watch?v=xF9CjluRFJ4 9
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Selection vs. design of gears Why do we care about gear tooth surface finish ± What affects the finish on the gear surfaces? ± How good could it be?
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 30

MIT2_72s09_lec13 - MIT OpenCourseWare http:/ocw.mit.edu...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online