Hi Everyone! I am here to see if anyone can help me determine the stall torque of a specific weight in Kg. I am using a 393 motor for my project which specifications say that it has a stall torque of 1.67 n-m, 14.76lbs (6.695kg) I am assuming this is the maximum load that it can move. What I want t…

The image you quoted is the units of what a newton-meter is. A better way to think about torque is that it is a force * distance. If you have your .73kg load, that is about 7.1 Newtons. Now from the definition of the stall torque of the motor, it is able to handle 1.67 N-M. From this we can cal…

[image] Eric_J: … There is a graph somewhere on the forums of the speed vs torque but I could not find it. … jpearman has done an amazing job of analyzing this sort of thing: [image] Motor torque-speed curves - REV2 VEX V5 General Discussio…

Motors give you a torque, not a force. The stall torque for a 393 motor in imperial units is 14.76 inch pounds. That means that if you attach the motor to a wheel with a 1 inch radius, the motor will push on the rim of the wheel with 14.76 pounds of force. If you use a wheel with twice the radius th…

Thanks so much for this guys, I think I have solved it! Can anyone tell me if I have got this right? I will do my best to show my working out. Pivot Distance (centre of Drive Pinion to pitch centre of Rack Gear) = 8mm (0.315”) Motor Stall Torque = 1.67Nm (14.76 in-lb) Load = 1.183 Kg (used to be …

Torque = 0.008 meter x 11.6 newton Motor torque Required to drive the mechanism = 0.093 Nm That looks right to me, but be aware that your actual load must include frictional forces, and for a linear slide, those frictional forces could be significant. Also, don’t forget to consider the weight o…

awesome! Do you have any idea where I can find any official documentation explaining how to work this out? It is for a university project and I need to cite the information. Thanks again

[image] Narmitz: …Do you have any idea where I can find any official documentation explaining how to work this out? … If you’re talking about how to calculate torque, I would guess that any first-year physics textbook should cover that calculation somewhere. If you’re talking about the torqu…

How do you convert nm to in-lbs

[image] nalobots: How do you convert nm to in-lbs A nm is a newton-meter. One newton is a force that’s equal to about 0.22481 pounds of force. A meter is equal to about 39.37 inches. So a nm would be (0.22481 pounds of force)x(39.37 inches) = 8.85 in-lbs. Example: What’s 7 nm converted i…

Stall Torque question

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FullMetalMentor April 5, 2015, 5:09pm 3

jpearman has done an amazing job of analyzing this sort of thing:

https://vexforum.com/attachment.php?attachmentid=6427&d=1341809892