@Eslam Mohamed True, as well as inertia, and a number of other potential considerations. The goal is to provide a ballpark figure since it’s likely nothing has been selected prior to using this tool, and most people don’t know coefficients of friction etc. Given the feedback, it might be interesting to create a more involved calculator in the future. Appreciate the feedback.
nice one sir . but i still need your help. i have key in mass=10kg, radius=0.034m, velocity=0.025m/s, max incline=15degree, voltage=12V, accelaration=0.2m/s2, efficiency=65%, and the result i have from your calculator is angvelocity=7.0251rpm , 7.3kgfcm, and total power=0.53W. Can you show me the manual calculation with the correct formula and its respective value in case to get the same result with your calculator , please ? because i already try to understand your formula in tutorial page , but still cant get it until now… really appreciate your help sir 
@mrz Unfortunately here’s not the place to write out complete calculations. We suggest you create a new post on the RobotShop Forum and follow the tutorial, writing the formula with the variables, then the formula with your numbers. We’ll be able to check there and provide feedback.
hi, i have a 500 rpm motor of 1.5 kg-cm torque and 150 rpm motors of unknown torque. just wondering if i could combine them in a robot to achieve more torque.
@apchu It’s always best to use identical motors in a robot drive system. Combining different motors, even of the same speed but different torque might create problems.
thanks, i am building a off road robot for competitions. what kind of motors would you suggest, i also need help related to the wheels that i must use. this event has elements like dirt , mud, glass ,water,fire etc. what all should i take care of while building this robot.? i have used your sizing tool and would like to ask whether the torque mentioned above is stall torque or continuous torque?
also i would suggestions as to what material i should use for building a chassis for a atv that is supposed to be built for speed
@apchu The torque is what is required to accelerate up the incline specified. This should be continuous torque (torque at max power). Stall is when the motor burns. If the robot will travel over fire, then rubber will melt if exposed for too long, and glass can puncture an air-filled tire - you’ll need to consider using metal tracks with metal shock absorbers. If you really need wheels, The chassis should be fine out of aluminum. Protect the electronics inside using one or more fans blowing outward.
hi,
i was wondering how can make the circuit connections inside the robot as to make is secure and prevent is coming off while high speeds and collisions.
@apchu Wiring between electronics should be secure in some way - either using connectors, screw terminals or soldered.
how do I calculate for velocity and acceleration?
is it velocity = displacement/time
acceleration =change in velocity/time?
or is there any other method of determining this?
@Samuel Those values are actually what you would like your robot to have, so you can estimate them. Yes, velocity (should be speed actually) is distance over time, while acceleration is change in velocity over time (as the units indicate).
Im using 6kg solar panel need to rotate how torque of stepper motor is meadure
@Leshu You would ideally need to provide a sketch / drawing and an arrow pointing towards the ground (gravity) and the direction of rotation so we can better understand. Can you create a new post on the RobotShop Forum?
Hello, may I know if the tool is still working? I didnt see any changes to the Output after I key in all the Inputs.
@shiba17 Seems to be working; as soon as any of the input values are changed, the output changes as well. Tell us if you see otherwise. Tested with Chrome and Firefox.
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Hi cbenson, what OS are you using? I’ve tried XP and Windows 7, using chrome and firefox. The outputs will not update no matter what input is changed.
Ah, that may be correct - we’re on Windows 8 and 10 here. Don’t have an XP or WIndows 7 machine to test on. We’ll submit as a possible issue and have our programmers investigate. Can you verify that your browsers are up to date? The “program” behind the scenes is really just html, and nothing fancy. You can even see it all by pressing F12 in Chrome. The function which recalculates the output values is run “onkeyup” for each input box. Thanks.
I am also not receiving any change in output. This was working last week for me. I have Windows 7 and have tried both chrome and firefox. Having the same issue as davidaelam.
The tool doesn’t seem to do anything when i enter the known values. is this still a working tool? I tried in chrome and edge. Im using windows 10
Programmers are looking into it now. Sorry for any inconvenience.