3) A double screw (Acme thread angle o = 14.5) mechanism is designed to lift a load of18,000 lb in such a way that screw is loaded in tension. Use of Safe Factor of safety of 3.2.Select a suitable screw from data table provided in class notes for tensile load and shearload. Limiting tensile and shear stresses are 10,000 psi and 5,500 psi, respectively. Requiredthickness of Yoke which functions as a nut. It is desired to raise the hatch a total of 30.0inches in 15 seconds. Use coefficient of friction f= 0.15. List necessary assumptions. Sketchand Label a schematic diagram. Determinea. Nominal major diameter of screw (D)b. Threads per Inch of selected thread (n)c. Thickness of Yoke (h)d. Lead angle (2)e. Torque required to raise the load (Tup)f. Torque required to lower the load (Tdown)g. Efficiency of the screwh. RPM required to operate each screwi. Compute the Total Power required to operate the mechanism.

Since you have posted a question with multiple sub parts, we will provide the solution only to the…

Answered: = 3) A double screw (Acme thread angle…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

4) An electric motor purchased by your employer surprisingly arrived without a keyway in the shaft. The motor has power rating of 7.5kW & 1,800rpm & has a shaft of 17mm. It will be used to drive a centrifugal pump using cast iron sheave. Design the square key to be used in the assembly based on maximum bearing & shearing stresses of 580MPa & 370MPa, respectively, and factor of safety of 5.
For a square thread power screw, given that:F= 6.4 kNPitch = 5 mmMajor diameter = 32 mmTotal raising torque = 28 N.mThen then max. torsional shear stress equals:
Design a scissor jack for a typical vehicle.• Specify design considerations/requirements (weight to be lifted, initial position, final position, safety factor,etc.)• Specify dimensions and select material for all members. Use the same design channel (Ex. U-channel) forthe 4 major members. Consider buckling if the member is under compression. Specify thread dimension(including engagement length) for the center/horizontal member
Calculate the maximum tensile stress developed in a 1/4-20 bolt (Major dia = 0.2500" and Root dia = 0.1959"), 3" long, and a head height of 0.1875", if it is subjected to a load of 426 lbs.
10) A screw clamp similar to the one shown in the figure has a handle with diameter in made of cold-drawn AISI 1006 steel. The overall length is 3 in. The screw is in-14 UNC and is 5 in long. overall. Distance A is 2 in The clamp will accommodate parts up to 4 in tagh. (a) What screw torque will cause the handle to bend permanenly? See sample problem 10.1, sections 10.4, 10.7 Given; hordle dia : 16 in L: 3in. Disa: Zin 10/29 Find: Scrcw torque ,! Assumphon : The screw torque is far cold decun AISI 1006 steel. a L: 3- 8 2.406 in %3D 4 32 T: 2.406F H:(L-3) -굵)F. 2.188F F- (2406 F: 2.188F Sy: 41 Kpsi. 32 (2-188) F TI (O.1875)3 Sy = 32M F-12:13 1bf T. 2.406 CI2:13) = 29.216f. in The lorque of the screw which will couse the scoch to bend pemorently is 29.21of. in. is 29.210f.10.
Draw FBD and determine Stress and Safety Factor of Bicycle Axle (Thru Axel) Specification Weight of cyclist = 120 kg. Materials: Aluminum alloy (AL 6061-T6) Dimension: Length = 122 mm, Diameter = 12 mm, Thread pitch = 1.75 mm, Thread Length = 16 mm.
Required information For a bolted assembly with six bolts, the stiffness of each bolt is kb 2 Mibf/in and the stiffness of the members is km = 13 Mlbf/in per bolt. An external load of 80 kips is applied to the entire joint. Assume the load is equally distributed to all the bolts. It has been determined to use 1/2 in-13 UNC grade 8 bolts with rolled threads. It is desired to find the range of torque that a mechanic could apply to initially preload the bolts without expecting failure once the joint is loaded. Assume a torque coefficient of K = 0.2. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Determine the maximum bolt preload that can be applied without exceeding the proof strength of the bolts once the load is applied. The maximum bolt preload that can be applied is Ibf.
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))
1. For a bolted assembly with six bolts, the stiffness of each bolt is k, = 3 Mlbf/in and the stiffness of the members is km = 12 Mlbf/in per bolt. An external load of 80 kips is applied to the entire joint. Assume the load is equally distributed to all the bolts. It has been determined to use 1/2 in-13 UNC grade 8 bolts with rolled threads. Assume a torque co-efficient of K = 0.2. a. Determine the maximum bolt preload that can be applied without exceeding the proof strength of the bolts. b. Determine the minimum bolt preload that can be applied while avoiding joint separation. c. Determine the value of torque in units of Ibf-ft that should be specified for preloading the bolts if it is desired to preload to 75% of the proof load. d. Determine the yielding factor of safety for part c). (based on proof strength)
3) To provide a clamping force of 48,000 lb between two components of a machine (Tensile load, ignore bending), A set of six screws is used. The load is equally shared among three screws. Specify suitable standard screw, including grade of the material (Use Table 10.1 and 10.4 from the book to select the standard size screw. SAE Grade 7 type fasteners with UNC thread need to be used.). Clearly write down all the assumptions, and the details of the screw selected. Calculate the torque prescribed.
Please answer in this format. Sketch: Given: Required: Solution: (Please answer in detailed (step by step). Indicate labels on what you are doing/performing, for example what formula is used) A torque To is transmitted between two flanged shafts by means of four 20-mm bolts. diameter of the bolt circle is 2=150mm. If the allowable shear stress in the bolts is 90 Mpa, what is the maximum permissible torque? Disregard friction between between flanges. The To
A collar is fitted as a tight fit on a solid shaft. made before assembly in measuring, the outer diameter of the ring is dga=159.97 mm, the inner diameter is dgi= 100.03 mm, the outer diameter of the shaft is dma= 100.048 mm. After assembly; a. What is the surface pressure between the shaft and the ring? b. What is the maximum shear stress? Given: Material pair steel/steel E=2.1x105 N/mm2 , Tmax = P (1/QG^2)

SEE MORE QUESTIONS

Recommended textbooks for you

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Control Systems Engineering

Mechanical Engineering

ISBN:

9781118170519

Author:

Norman S. Nise

Publisher:

WILEY

Mechanics of Materials (MindTap Course List)

Mechanical Engineering

ISBN:

9781337093347

Author:

Barry J. Goodno, James M. Gere

Publisher:

Cengage Learning

Engineering Mechanics: Statics

Mechanical Engineering

ISBN:

9781118807330

Author:

James L. Meriam, L. G. Kraige, J. N. Bolton

Publisher:

WILEY

SEE MORE TEXTBOOKS