get the resultant moment

hi everyone ,
i have two pulleys which are connected through belt , the diameters are 150 mm and 300 m
the question is that when i apply torque 10 n-m on 150 pulley i should get torque 20 n-m on the center line of the 300 pulley " or i think though " but the torque is reduced ?
can any one tell me why that , and the right way to get that resultant torque is by using solidworks simulation , or solidworks motion analysis

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Power / torque transmission standard calculations for belt drives have been around for a long time the belt drive calculator in solid works is based on these well established formula's. The power transmitted by a belt drive is a function of belt tensions and belt speed

Power = (T1 - T2)v , W is the basic formula. To understand how the formula works and what it all means you need to learn stuff that has nothing to do with Solid works or any other CAD package but with Mechanical theory, Physics, the underling knowledge of good mechanical and machine design. CAD is just a tool, like a spanner or any other tool it does not do the thinking, we do the thinking. To be a good engineer, a good knowledge of how things work is required, I have a good library of engineering text books some of them I purchased 46 years ago when I started down this career path, some purchased only recently, but when I need to remember some long forgotten calculation or formula I can find what I need in one of these books.

 
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