By Alan Hendrickson
Scenic results regarding rotating turntables, monitoring level wagons, and the vertical move of curtains and painted drops became universal in either Broadway and nearby theatre productions. The machines that force those results variety from small pneumatic cylinders pushing a great deal of a couple of kilos an inch or , to forty horsepower winches working multi-ton surroundings at speeds 6 ft in line with moment or extra. often this equipment is designed through theatre technicians in particular for a selected show's impression. in comparison to basic undefined, this layout procedure is brief, usually just a couple of days lengthy, it really is performed by way of one individual, layout groups are infrequent, and it really is performed within the absence of reference fabric in particular addressing the problems concerned. the most objective of this publication is to therapy this final situation.Mechanical layout for the degree may be a reference for you that will:* give you the uncomplicated engineering formulation had to are expecting the forces, torques, speeds, and tool required by way of a given movement* supply a technician a layout procedure to stick with so one can direct their paintings from basic thoughts to express element as a layout evolves, and* convey many examples of conventional level equipment designs.The book's emphasis can be on following normal engineering layout and development practices, and constructing machines which are sensible, effective to construct, simply maintained, and secure to exploit. * offers the fundamental engineering formulation had to expect the forces torques, speeds, and tool required via a given circulation * describes the most typical strength transmission elements utilized in stagemachines: curler chain, cable drums, bearings, apparatus reducers, and so forth. * provides a technician a layout strategy to stick to so as to direct their paintings from basic thoughts to precise element as a layout evolves * exhibits many examples of conventional degree equipment designs
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Additional resources for Mechanical Design for the Stage
2 will attempt to clarify. 2a, a cable pulls on a platform sitting on a level floor. 2 Examples of static friction opposing forces parallel to the plane of contact rake 34 Mechanical Design for the Stage plane of contact. The cable pull, F applied , acts parallel to the plane of contact and is the sole force capable of sliding the platform along the floor. The force due to friction, F friction , and specifically here the force due to static friction, F fs , will exactly oppose the cable’s pull.
What force parallel with the plane of stage floor is needed just to overcome rolling friction? SOLUTION: Because the stage floor is level, and there are no other forces contributing to the normal, the normal force equals the weight of the wagon, 665 lb. 6 lb Friction of Ropes on Cylinders The act of taking a wrap of rope around a fixed pipe to control the descent of a heavy object is a common trick of the trade. The friction between rope and pipe absorbs some of the tension on the line due to the weight of the object being lowered, and this makes the person’s job much easier.
Only when the area becomes small enough that the forces involved cause the one material to dig into the other will this area independence vanish. A material’s surface finish or texture has a major impact on its coefficient of friction. 1 Coefficients of Static and Kinetic Friction a. Ultra-high molecular weight polyethylene, an inexpensive plastic often used for guides. Chapter 4 – The Friction Force, Ffriction 35 an identically loaded steel file. The file’s teeth dig into the other surface, forcing a shearing action on that surface rather than a sliding action.