I’m designing a mini CNC and need to know the exact gear ratio for these Gearmotors. Do the Micro Metal Gearmotors 10:1 and 5:1 have this exact ratios or are them approximate?

I’ve taken apart a 10:1 model gearbox from the motor and taken a picture of the motor pinion and then examining the photo I counted 13 teeth, but the gearbox itself is pressure assembled and I’m afraid of spoiling it if I try to disassemble it in order to apply the same procedure for counting the number of teeth.

Does someboby know the number of teeth of the different gears/pinions in the gearboxes or the global exact ratios?

Thank you very much for your answer!

robomac