I have no prior experience in dealing with rpms, and I would appreciate it if y’all could provide a easy, concise, explanation of how rpm works in mechanisms and how you calculate rpms. Also, how much rpms is considered “slow” and how much is considered “fast”? Thanks for the help y’all! Vex commun…

To find the RPM of an output shaft/mechanism, take the input RPM (i.e. the motor speed), and multiply it by the gear ratio (the ratio of the number of teeth on the input gear to the number of teeth on the output gear). Example: A flywheel with a 600 RPM motor powering a 60 tooth gear which, in turn…

aight thanks for the quick reply

A more general formula would be something like rpm = (input speed)*(driven gear/output gear)

oh yeah just one more thing, whats the best rpm for an x-drive and for a dr4b?

Of course, it depends on what kind of tasks you want to complete with either, but these are pretty general. X-Drive: Generally 200 RPM motors are used, creating an effective drive speed of about 200*1.414 = 283 RPM. DR4B: Usually something like 100 RPM on a 1:5 gear ratio for an effective speed of…

FYI. Incase you were not aware RPM stands for Rotations Per Minute. It is important to note that a 4” wheel drivetrain on 200rpm will be faster than a 3.25” drivetrain on 200rpm because every rotation on a 3.25” wheel is less than that same rotation on a 4” wheel. Also on the forums people tend to g…

How do you put that in account into the equation for rpm though?

And by the way I put up a discussion already and answers the question. I made it a couple of days ago. I think it literally had the same exact title

For example, for the drive, you find the output RPM (say 200), then to find the speed of the drive, you multiply by the circumference of the wheel to get distance per minute. For a 200 RPM drive on 4" wheels in tank drive (not x-drive), the robot travels at 200 RPM * 1.05 ft. = 210 ft/m = 3.5 ft/s …

No I am saying like lets say you have 5/3 gear ratio with a 200 rpm motor. And for your wheels you have 4" wheels. So if you were not to account for the wheels rpm the 36 tooth gear is going 334 rpm. But what acctually matters is the wheel. So how do you account for than in the equation or am I lo…

How do you calculate rpm?

VEX V5 General Discussion

Calvin_Thrasher May 8, 2020, 3:56am 17

Ok that is what i’m doing for mine too. Thank you. If you want to see the cad of my robot I have planned it’s this