Hi all, I am working on a slider crank mechanism for moving an object of about 100 kg back and forth 30 mm at about 600 rpm. I plan to attach the connecting rod onto a flywheel that act as a crank, or attach to a pulley (in case need to use a transmission system to reduce input speed, increase torque from a high power motor). With 30 mm stroke or crank length 15 mm, the pin for attaching the conrod onto the flywheel/pulley would be fairly close to the shaft of the flywheel/pulley. Due to that, the choices of diameter of both the pin and shaft would be fairly limited, both would be fairly small sized. For that, are there any calculations that are critical for determining the size of both the pin and the shaft? Or would it be fine to use a pin and shaft of any diameters as long as they can be attached to the flywheel 15mm apart? I have searched for relevant formulas but cant figure that out so far… Beside the diameters and friction, mind to advise other factors critical to the functioning of the mechanism? Pardon me if any lacks of physics knowledge demonstrated, I am no longer a student, did studied Physics back in old days...this is just something I am working on for my own. I am willing to do some readings for relevant physics theories involved, would really appreciate any advice or references given. Thanks in advance.