I would like to use a pair of equal diameter spur gears to connect opposing friction drive rolls ("pinch rolls"). The hardened steel rolls will be about 3 inches in diameter (I can specify this) and the strip will be between .035 and .058 inches thick, therefore the center distance will need to vary by about .030". The rolls will be pinched together with a pneumatic cylinder and linear guide. One roll (gear) will be driven by a (gear)motor with the other roll driven by the first one. Will a standard stock spur gears (such as those available from Boston Gear or others) work in this application? The drive and load direction will always be in one direction, and the gears will be open with grease lube. Should I go with the largest diametral pitch? Should the load factor be de-rated? The speed is very low - less than 60 rpm. I understand that the contact ratio should not be allowed to go below 1.2 - but how do I calculate that. Thanks in advance.
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