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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The minimum required length of a key for a gear carrying 20000 lb.in of torque if it is mounted on a 3.75 in diameter shaft is most likely:
Consider SAE 1018 as the key material.
1.20
3.5
1.53
1.45
A 80 mm steel shaft develops 5 kN - m torque and using a flat key to fasten a 250 mm pulley. The crushing stress of the key is 50 MPa. The key has a width and length of 20 mm and 150 mm, respectively. What is the key thickness?
A. 21.15 mm
B. 26.86 mm
C. 33.29 mm
D. 36.48 mm
A chain sprocket system is designed to drive a shaft. Assume the following conditions: Use SAE1018 steel for the key (which is the weakest material in comparison to other components) The chain sprocket has a bore diameter of 2.5" and the hub length of 3.125". The sprocket delivers 110 horsepower to a shaft with the rotation of 1700 rpm. Safety factor of 3 Determine 1). The dimensions of the square key: Width: in Minimum length (so the key will not fail): in 2). The minimum contact length on the hub (so the hub will not fail): in
Chapter 11 Solutions
Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
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- A shaft turning 150 RPM is to drive another shaft at 200 RPM. Find the diameters of the two pulleys, using integral number of inches for each diameter, to give as nearly as possible a belt speed of 2500 FPM. Please provide illustration.arrow_forwardA 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.arrow_forwardThe diameter of shaft is 45mm. Compare the shear stress in the key to the torque in the shaft. calculate the key size to use for the 15 kW low speed shaft with a speed of 384 rpm. Take bxb = 10mm x 10mm as d = 45mm L = 1.5 cm.arrow_forward
- Below question is from machine design. Please solve asap. You have to select bearings which are used to support a shaft, bearings are mounted at each end of shaft and 1.20 metre apart. A 600 mm diameter pulley is mounted at a distance of 300 mm to the right of left hand bearing and this drives a pulley directly below it with the help of belt having maximum tension of 2.25 kN. Another pulley 400 mm diameter is placed 200 mm to the left of right hand bearing and is driven with the help of electric motor and belt, which is placed horizontally to the right. The angle of contact for both pulleys is 180º and .Allowing working stress of shaft depends on the material you have selected for the shaft. Select the type of bearing mounted on both ends of shaft (either ball or roller bearing type and also elaborate the scenario for the selection of bearing).The Reliability Factor for Bearing may vary from 92% till 96%arrow_forward4) In a single plate clutch both sides are effective. The clutch transmits 10 Kw power. The maximum torque is 120 Nm, the maximum axial force should not be more that 100 KN/m2. The outer diameter of the clutch plate is 1.3 times of the inner diameter. Find out the axial load exerted by the spring and outer and inner diameters of the clutch plate.arrow_forwardA 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_forward
- Select a proper key from the table below. The shaft has a diameter of 70mm and transfers a torque of 350 Nm. The hub has length of 55 mm. The key is madefrom steel with σy = 235 MPa, the shaft is made from steel with σy = 355 MPa, andthe hub is made from steel with σy = 275 MPa. The safety factor is 2,5.arrow_forwardAn 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 inarrow_forwardAn electric motor running at 1200 rpm drives a punch press shaft at 100 rpm by means of a 130 mm wide and 8 mm thick belt. When the clutch is engaged, the belt slips. To correct this condition, an idler pulley was installed to increase the angle of contact, but the same belt and pulley were used. The original contact angle on the 200 mm motor pulley is 160 degrees. The original tension ratio is 2.4 and the net tension is 12 N/mm of the belt width. If an increase in transmission capacity of 20 % will prevent slippage, determine the new angle of contact. Please show your correct and complete solution to this problem. ASAP! Thanks.arrow_forward
- Find the distance ( mm ) measurement between preload and major load position of the Rockwell Hardness Number 50HRCarrow_forwardPlease solve ellaborately and include the untis in every step, show diagram and write your solutions clearly and readable if your solution is in written form. Your work will be appreaciated much. Thank You! Two shafts 30 in. apart, each carrying a four-step pulley, are to be connected by a crossbelt. The driving shaft is to turn 180 rpm while the driven shaft is to turn 50, 150, 250,and 600 rpm. The smallest step of the driver is 10 in. in diameter. Find (a) the diametersof all the steps, (b) angle of contact for each pair of pulleys, and (c) belt length.arrow_forwardDescribe the failure of a hollow torque tube. Calculate the forces creating the failurearrow_forward
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