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- Question No.16: A double threaded power screw with ISO metric trapezoidal threads with 15° semi-angle of thread is used to raise a load of 300 kN. The nominal diameter is 100 mm and pitch is 12 mm. the coefficient of friction at screw threads is 0.15. Neglecting collar friction, calculate; (i) torque required to raise the load, (ii) torque required to lower the load and (iii) efficiency of the screw.Used to mesh worm gears and transmit motion between two shafts at right angles to each other but not in same plane a. Unified thread c. Helical thread b. Worm thread d. Brown & Sharpe Worm Thread _______has a work table-which may be swivelled around two horizontal axes and also adjusted horizontally and vertically. a . Standard Shaper c. Swivelled shaper b. Horizontal Shaper d. Universal shaper _____are defined as headed fasteners having external threads that meet an exacting,uniform bolt thread specification such that they can accept a non-tapered nut. a Bolts c. Screw b. Non tapered nut d. External threaded rod _______ defined as headed, externally-threaded fasteners that do not meet the above definition of bolts. a. fasteners…Can you give a more detailled explanation for part C and answer to the following question please: What is the twist angle (in degrees) of pulley A with respect to pulley C?
- a single-start, square-threaded power screw with the following parameters: PARTS A - D circle final answers for each part A -  A weight of 1500 N must be lifted. What is the total required torque necessary to lift this weight? Give your answer in units of N m. Part B - if the available power to drive the screw is 1,011 Watts, determine the fastest speed at which the weight can rise. Give your answer in units of mm/s, Part C - The efficiency of the preceding power screw (expressed as a number between 0 and 1, not as a percentage) is ? Part D - Suppose a high-quality thrust bearing was used to eliminate the collar friction. The efficiency of the screw would now be?Consider a thread callout of Dia 0.500-24 UNF-3A. Based on the information given, is this thread/screw an external (male) thread or an internal (female) thread?How long is the thread at 4B? What do the brackets around dimension 241 at 3C indicate?
- A 10 ton screw jack with a size of 2 ¾ - 3 acme thread. Assuming =0.125 due to average quality material and workmanship. Determine the torque to lift and lower and efficiency for a) single thread b) double thread.In an external thread the root diameter can be calculated by the following expression OD-2X depth mm 0.61X Pitch cm OD-2X depth cm 0.61X Pitch mm ------------ In a taper turning operation 30 is the diameter of the large end in mm, 20 is the taper angle in ° and 28 is the length of taper in mm. Find the diameter (d) of the small end in mm Diameter (d) of the small end in mm AnswerConsider a thread callout of Dia 0.375-10 UNF-2B. How far will the thread travel if it is subjected to 3 full rotations? (Assume infinite thread lengths for simplicity)? Units are in Inches List your answer in a decimal format.
- In using the formula for measuring an American Standard Unified Screw Thread by the three-wire method, why should the constant 0.86603 be multiplied by the pitch before subtracting from measurement M, even if not enclosed by parentheses? E=M+0.86603P+3W ?Design of the Screw Jack. Lifting load – W, kN is 70. Hight of lifting– H, mm is 500 Types of threads is Square Material of nut is Cast ironWhat is Double Slider Mechanism? What are the inversions of thismechanism? Differentiate them from one another