![]() However, if the belt sections are now stretched on the tight side, then these sections must move faster in order to transport the same mass over the imaginary point compared to the shrunken sections on the slack side. Figure: Increase in speed due to mass conservation Otherwise, belt mass would miraculously accumulate (or be destroyed) between the two imaginary points, since more (or less) mass is moved in over the imaginary point than is moved out again at the other point. Sliding slip is the complete sliding of the belt over the entire pulley in the event of overload (complete relative motion between belt and pulley)! Belt speedsĭue to the conservation of mass (condition of continuity), the same belt mass must be moved past an imaginary point within a certain time on the tight side as well as on the slack side. This is then referred to as sliding slip. Note that every belt has a certain elasticity and therefore always results in elastic slip, whereby sliding slip should always be avoided. In addition to elastic slip, which is due to the elasticity of the belt, the belt can also slip completely over the entire driven pulley in the event of overload. The relative motion on the pulleys, which is always present due to the elasticity of the belt, is called elastic slip (partial relative motion between belt and pulley)! The surfaces of pulleys must therefore not be too rough, as one might misleadingly assume due to the increased static friction on rough surfaces! From the belt’s point of view, elastic slip should always be kept as low as possible, otherwise enormous belt wear will occur due to the strong relative motion. Such (elastic) stretching or shrinking processes of the belt on the pulleys, which inevitably lead to relative motion, are also called elastic slip. Animation: Stretching and shrinking of the belt around the pulleys If one compares these pulley markings with the belt markings, the relative motion between belt and pulley can be seen very clearly. In the animation below, additional marking lines are attached to the pulleys for better orientation. The belt is streched by sliding processes on the driven pulley in the direction of the tight side and contracts again on the driving pulley in the direction of the slack side! The belt shrinks on the driving pulley, so to speak, and thus also results in relative motion and thus in sliding. there is relative motion between belt and pulley and thus sliding!Ĭonversely, the belt section coming from the tight side (and thus maximally stretched up) contracts during rotation around the driving pulley due to the decreasing belt force. The stretching belt section is pulled over the pulley, so to speak, i.e. If a belt section between two marking lines is now looked at more closely, this section is obviously stretched on the driven pulley during rotation. ![]() The line spacings gradually adapt to the new conditions as the belt moves around the pulleys. If marking lines are applied to the belt at equal distances in the load-free state, the line distances on the tight side of the belt increase due to the increased belt force during operation and decrease accordingly on the slack side due to the reduced force. Due to the elasticity of the belt, the different forces also cause different elastic strains. Conversely, the belt force at the driven pulley decreases again from the value of the tight side force to the value of the slack side force by releasing the circumferential force (see article Maximum belt stress). ![]() Starting from the slack side force, the belt force increases at the driving pulley (by applying the circumferential force) to the value of the tight side force. Tape should brush across both hipbonesĢ.When the belt rotates around the pulleys, it is exposed to different forces. Keep tape slightly loose to allow for breathing roomĢ. ![]() Pull tape across the fullest part of the bust,keep the tape a bit looseĢ. Measure across the back to the same point on the other shoulderĤ. Our designers will appropriate enlargement to make clothes according with your measurement.Ģ. Please provide your accurate body measurement. For example,if your chest measures 32” and the size you’re looking to purchase has a chest measurement of 34” it may be a bit snug.When in doubt between two sizes,choose the lager of the two. Unless the costume is meant to be skin tight,you should choose a size that allows room to move.To ensure maximum comfort,you should give yourself 3-4 inches for movement.Please note that your normal jacket or pants size is not equal to your body measurements. ![]()
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