Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
6th Edition
ISBN: 9780134441184
Author: Robert L. Mott, Edward M. Vavrek, Jyhwen Wang
Publisher: PEARSON
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Chapter 11, Problem 3P
To determine
The required key geometry, length, width, and height.
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A shaft where a hub is mounted has 2 in diameter, transmitting 20 hp power at 750 rpm. Design a square key made of steel for factor of safety (n) =3. Use preferred sizes.
3 3/8-in. shaft, of AISI C1045 WQT1000, has a pulley keyed to it.
Compute the (a) length of square key, and the
(b) length of flat key
such that a key made of cold finished AISI B1113 has the same yield strength as the shaft does in pure torsion.
An SAE 1050 Cold drawn steel is to be used for a square or rectangular key. The shaft is made of SAE 4340 OQT400 and the diameter is 2.5 inches. The torque transmitted by shaft is 15,000 lb-in. Design factor, N=2. The hub is made of SAE4340 OQT400and the length of hub is designed to be 3 inches.
Which one of the following square keys can be used for this design?
Note: How do I determine answer if the diameter is between two values?
(a) 0.375 in x 0.375 in
(b) 0.500 in x 0.500 in
(c) 0.625 in x 0.625 in
(d) 0.750 in x 0.750 in
Chapter 11 Solutions
Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
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- The standard cross-section for a flat key, which is fitted on a 50 mm diameter shaft, is 16 x 10 mm. The key is transmitting 475 N-m torque from the shaft to the hub. The key is made of commercial steel (oy = 230 N/mm²).if the factor of safety is 3. Determine the length of the key.arrow_forwardA shaft transmitting 10kW of power at 750 rpm, has a diameter of 20mm. Design a square key made of steel for: factor of safety (n) =2. Use preferred sizes.arrow_forwardProblem Chain and Sprocket. A single-strand roller chain drive connects a 10-hp engine to a lawn waste chipper/shredder. As the engine operates at 1200 rpm, the shredding teeth should rotate at 240 rpm. The drive sprocket has 18 teeth. Determine an appropriate pitch for the chain, the number of teeth on the driven sprocket, the pitch diameters of both sprockets, and the chain speed. Also indicate the number of links in a suitable chain and specify the required center distance.arrow_forward
- A portion of the shaft where a gear is to be mounted has a diameter of 1.5in. The gear transmits 3000 lb.in of torque. The shaft is made of SAE 1040 OQT400 steel, the gear is made of SAE 8650 OQT1300 steel, and the key is made of SAE 1045. The minimum required length for this key is most likely: 0.5in 2.5in 3.0in 1.0in 1.5inarrow_forwardThe minimum required length of a key for a gear carrying 20000 lb.in of torque if it is mounted on a 3.5 in diameter shaft is most likely: Consider SAE 1018 as the key material. 1.29 3.5 1.53 1.45arrow_forwardUse the drawing below to answer the following two questions. a. Determine the equivalent spring stiffness of the following system. Simplify the expression (ie – single common denominator. Your answer should be an expression of just K’s – no numbers). b. If the weight on top is 20 lb and the K1 = K4 = 50 lb/in, K2 = 33 lb/in and K3 = K5 = 25 lb/in, what is the natural frequency of the system?arrow_forward
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