I have a query that I hope to clarify. I currently have a gear motor with a rating of 650 lb-in, operating at a maximum speed of 47 RPM. My goal is to incorporate this existing motor into a machine to drive a roller at approximately 115 RPM at its peak speed. The gear motor is fitted with a 5-inch sprocket. If I attach a 2-inch sprocket to the roller, the gear ratio will be 5 to 2.5. Would this setup allow the roller with the 2-inch sprocket to rotate at a speed of 47 RPM multiplied by 2.5, which equates to about 117.5 RPM, assuming the motor is running at maximum speed? Additionally, considering the motor’s torque rating of 650 lb-in and the 2.5 gear ratio between the motor’s current sprocket and the one on the roller, will there be a noticeable impact on the torque delivered to the roller when using the 2-inch sprocket? I appreciate any insights or guidance you can provide.
Will the roller equipped with a 2-inch sprocket rotate at a rate of 117.5 RPM when the motor operates at its maximum speed (calculated as 47 multiplied by 2.5)? Absolutely. Additionally, this setup will impact the torque available at the roller with the 2-inch sprocket. Yes, indeed, the torque will be decreased by a factor of 2.5.
Thank you, Steve! I appreciated your input. I was trying to convey this point to a so-called mechanical "expert." He insisted that using a 2-inch sprocket would increase the torque at the roller. However, from my knowledge and experience from over 35 years ago, I found that hard to believe.
IronDesk40 commented: "Thank you, Steve! I was attempting to convey this to a so-called mechanical expert. He insisted that using a 2-inch sprocket would generate more torque at the roller. However, based on my knowledge from over 35 years ago in school, I wasn’t convinced. If you want to explore more on this topic, check out this link: https://www.google.com/search?rlz=1......0i131i67k1j0i67k1j0i20i264k1.0.vlnt7MoczYA"
Consider two sprockets connected by a chain. In your scenario, the shaft equipped with the 5-inch sprocket generates 650 in-lbs of torque. This indicates that the tension within the chain reaches 260 pounds (calculated as 650 divided by 2.5). The same tension applies to the 2-inch sprocket; however, it can only produce a torque of 260 inch-pounds.
Thank you! The Google link you provided is incredibly helpful. I've saved it as a bookmark for easy access in the future.
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