1. A machine vice, as shown in the figure has single start, square threads with 22 mmnominal diameter and 5 mm pitch. The diameter of the collar is 55 mm. the coefficientsof friction for thread and collar are 0.15 and 0.17 respectively. The machinist cancomfortably exert a force of 125 N on the handle at a mean radius of 150 mm.Assuming uniform wear for the collar,a) Calculate the clamping force developed between the jaws,b) Calculate the overall efficiency of the clamp.FixedjawMovingjawFrameScrew150 mmHandle

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Answered: 1. A machine vice, as shown in the…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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A Machine vice has single start square threads with nominal diameter 22 mm and pitch 5 mm. Collar diameters are 55mm and 45mm respectively. Coefficient of friction for threads 0.15 and u for collar 0.17 The machinist can comfortably apply a force of 125N on handle of mean radius 150 mm. Assuming uniform wear theory calculate, (1) The clamping force developed between the jaws, (2) The overall efficiency of screw
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The following data apply to the machinist clamp shown in the figure: Outside diameter of screw=1/2 in.; Root diameter=0.4350 in.; Pitch (single thread)=0.05 in.; Collar friction radius=0.20 in.; Collar friction coefficient=0.15; and screw friction coefficient=0.15. Assume that the machinist can comfortably exert a maximum force of 30 lbs. on the handle.Determine: (a) the clamping force developed between the jaws of the clamp; (b) the efficiency of the clamp; (c) the torque in the screw body at section A-A
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Problem 1 The SERO CHIENS C is recreating rolling large stone columns by animal power and pivot points cut into the center of each of the column. The friction in each pivot point plus the rolling resistance creates a resisting couple of 300 ft*lb (like a rusty bearing). The yoke angle B = 10°. a) Determine how many horses (i.e. horsepower https://en.wikipedia.org/wiki/Horsepower) they need to move a 4600-lb column that is 10 ft long and 2 ft in diameter up a 0 = 5° slope from rest to 3 miles per hour after 15 feet of travel. b) Determine how many horses they need to maintain a constant speed of 3 mph up the slope. Round your answers up to the nearest integer. A fraction of horse doesn't pull very well. Assume the column rolls without slipping.
4 A double-threaded power screw with square threads pushes against a load of 3,641 N at a speed of 15 mm/s. The screw has a major diameter of 20 mm and a pitch of 3 mm. The frictional coefficient of the threads is 0.25, and collar friction is negligible. What is the rotational speed of the screw in units of revolutions per minute? Type your answer 2 points
4. A square-threaded power screw has a mean diameter, dm = 1.75 in and a pitch, p = 0.875 in. The coefficient of thread friction is 0.10 and the collar friction is negligible. What horsepower is required to raise a weight of 3000 lbf at a rate of 20 ft/min?
Hello, could you please help with the question i have attached as an image, thnks
Problem number 1 only. Thank you so much!
A worm gear reducer is driven by a 1200 rpm motor. The worm has 3 threads and the gear has 45 teeth. The circular pitch of the gear is p=0.5”, the center distance is 4.5 inches, the normal pressure angle is 20 degrees, and face-width of the gear is b=1 inch. Use a coefficient of sliding friction of 0.029. Determine:a. Gear and worm diameters, and worm Lead.b. The worm gear efficiency
Please solve this question in hand writing step by step.
34 in 3. The following data apply to the C-clamp: a. The screw is ACME with ¾" Diameter b. Coefficient of thread friction = 0.12 c. Coefficient of collar friction = 0.23 d. Mean collar radius = 0.55 in. e. Max. clamping force = 1000 lb Determine: The tightening torque The operator force at the end of the handle (Note: Use table 8-3 to determine the screw pitch (p))

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