Lecture_Power_Screw_W2011

Lecture_Power_Screw_W2011 - Screws, Fasteners, and Power...

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Screws, Fasteners, and Power Screws R. S. Shaefer MAE-162D Mechanical & Aerospace Engr. Department University of California Los Angeles Winter 2011
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TOPICS •Administrative Stuff Project Relevant Updates •Selecting a motor(s) for your project •Power Screw (could be implemented in the project)
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ADMINISTRATIVE STUFF •Design Proposal Report is due March 18 (sample report has been posted) •Next two lab sessions: • I will hold meetings with each group in the room adjacent to the CAD lab 2 PM (Thursday) in the following order: Group-18, 17, 16, 15, 14 • The following week the order is reversed: Group-14, 15, 16, 17, 18
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Project Relevant Updates § Teams will load the rice manually § Demonstration/competition time is 5 min instead of 10 § Use of on/off switch: § If a rover can achieve automated start/stop, without using the on/off switch more than once during the entire trial, the team will receive extra credit. § Same battery pack will be provided to all teams: § Ten (10) AA rechargeable batteries § Rechargers will be made available § The cost of the screw terminal board, the battery pack, and the recharger will be deducted from each team’s budget (about ~$150 to $200) § $500 will be deducted from your team’s budget if the controller board is damaged. § $2.50 per minute will be charged for water jet usage
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Design Proposal Report (due March 18 th , 2011) •We will discuss your design proposal during the next two individual group meetings (Thursdays lab sessions) •Come to the meeting with the intend to discuss several concepts and/or design variations that you have been working on. •Bring hand sketches or CAD drawings to help the discussions. •Take a look a the Design Proposal Report outline (posted) to discuss questions you might have.
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Design Proposal Report OUTLINE Table of Content List of Figures List of Tables Sample Report is Posted on Courseweb Design Proposal Report Outline is also Posted
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TOPICS •Administrative Stuff Project Relevant Updates •Example of selecting a motor(s) for your project •Power Screw (could be implemented in the project)
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Example: Choosing a Go-Kart Motor The challenge: – Build a Go-Kart that goes up a 30 o hill at 4 mph (m = 90 lb, wheel diameter is 10 inch). – You are given a 9 amp-hour battery to power the Go-Kart. For the motor you have two options : Motor-1 : Electric motor, which draws about 20 A to produce 1 Hp with a torque of 60 N-m at 150 rpm. The motor costs $167.99. Motor-2: Electric motor that puts out 0.4 Hp at 2500 rpm drawing ~ 5 A. The motor costs $37.59. Both motors will do the job. Which one will you choose and why?
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Estimating Required Power for the Motor-2 Given : Electric Motor: 0.4 Hp at 2500 rpm Hill : 30 o slope Design Requirements: – Max speed 4 mph (up a hill of 30 o ) – Wheel diameter 10 in – Total Mass 90 lb Approach: – First determine the necessary POWER needed to move the Go-kart up the hill.
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Lecture_Power_Screw_W2011 - Screws, Fasteners, and Power...

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