newLecture--Week08 - Project Directed Dissection and...

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Project Directed Dissection and Introduction to Gear Design (Spur & Rack Gears) ¤ ¤ Engineering’1C03 ’ ¤ Dr.’T.’E.’Doyle
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Overview ¤ Directed Dissection ¤ Introduce Ideal Spur Gear Design ¤ Design Equations
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Directed Dissection ¤ I will open the CD-ROM in lecture and we will examine the contents, with particular attention to the project related parts. ¤ If you speak with upper year students, many will tell you that you need to buy a CD-ROM drive (+ tools) and dissect it yourself. It is not necessary to do this. ¤ Open CD-ROM. ..
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The CD-ROM ¤ Note the position of: ¤ Motor, ¤ Spur / rack, ¤ Bevel (we will not use bevel gears), and ¤ Read-head. ¤ For your project, the shown mechanism is not available and you must redesign the gear train. Your motor will be in a completely different location and your design is space limited.
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The CD-ROM 2 Motor Spur / rack Bevel Read-head Rails
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Project Notes ¤ The project spec will be periodically. (Please check often) ¤ If you are unclear on the specification of the objectives, please ask! (and ask early!) ¤ Instructional Assistant Interns have office hours every day ¤ Dr. Doyle has office hours on Mondays and Tuesdays from 2-3pm.
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Simplified Ideal Gear Design ¤ As suggested in your project part-1, your simplified ideal gear design can be composed of primitive shapes (e.g. cylinders, disks, etc.) ¤ Recall the lecture discussion example regarding two cylinders in contact. ..
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Simplified Ideal Gear Design 2 ¤ Consider the ideal case of two parallel cylinders that are in contact through a point of tangency. ¤ One cylinder ʼ s radius is twice that of the other (R2 is twice R1). ¤ In the ideal case where the system is lossless and friction between the cylinders is such that no slippage occurs, what would you expect the rotation speed of the small cylinder to be of the large cylinder is rotating at 1 revolution per minute?
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Simplified Ideal Gear Design 3 ¤ Given the ideal system, conceptually we can see that at the point of contact the two cylinders would have the same speed, but the angular velocity of the smaller gear would be twice that of the larger with opposite direction. ¤ Assuming the two cylinders continue to rotate in the
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This note was uploaded on 10/14/2011 for the course ENGINEER CHEM ENG 3 taught by Professor Ghosh during the Spring '11 term at McMaster University.

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newLecture--Week08 - Project Directed Dissection and...

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