AM SS: CIM motor speed at robot full speed

[de_]

re a Andy Mark Supershifter, 2 CIMS (what ever overal gear ratios / wheel sizes you used), full weight robot

We have a spreadsheet that predicts what our motor rpm must have been for the measured speeds we observed. Just wondering if anyone else has done this and has some actual speeds and calced motor RPM to use for comparision so we can feel comfortable there are no errors in our spreadsheet.

[Gary Dillard]

Seems pretty straight forward -

Speed of S Feet/Sec
Total Gear Ratio From the Motor to the Wheel Shaft of N
Effective Wheel Diameter D

(S Ft/Sec)*(12 in/ft)*(1Rev/PI*D in)*(60 sec/min)*(N Ratio) = Motor Speed in RPM

The effective wheel diameter on carpet may be the only unknown, but you can figure that out by rolling the robot one complete wheel revolution and using the distance for PI*D

[de_]

Well there are 3 computer/electrical engineers working on it (my, myself and I) and we have been known to enter spreadsheet stuff incorrectly. We are thinking of getting some custom gears made which would be a disaster if the spreadsheet incorrectly calced the needed ratios. Hence the attempt to get results from other teams for verification. Also it would help with the credibility of my numbers to other team members

[Gary Dillard]

Plus you're in Canada, make sure you calculate the gear ratios in metric