Often times doing the calculations to size a motor can be a tedious process, so we use this calculator to simplify things. Just fill out the yellow spaces and the calculator will do the rest. It can be handy to play around with the variables to explore drive screw and motor options, and we hope that you find this calculator useful.
This calculator was built to help us size drive screws and the motors that drive them. We have made several assumptions with the variables and have left them filled in, such a screw efficiency of 90% (specific to some common ball screws), a density of 4.48oz-in3 (specific to a common steel ball screw), a coefficient of friction of 0.001 (refers to a commonly used rail and recurculating bearing system), motor inertia of 0.775oz-in2 (specific to our commonly used servo motors), and a conservative safety factor of 1.2 for servo motor systems. We left these variables in place for the sake of convenience and they can of course be changed. Users should take care when making these calculations as many factors come into play that we could not possibly account for, such as additional friction due to grease, or uncommon loads coming from other components of the system.
This calculator works best from a full sized desktop computer
