Hello, assuming that everything of the three motors are the same except that the gears are made of different materials. The first one is made of Delrin composite gears, the second one is made of metal and plastic gears and the last one is made of metal gears. How are they ranked in terms of strength against wearing down? I suppose metal gears are better than metal+plastic gears. How is Delrin composite ranked? Is it as strong as metal?
They can be and even better depending on the design requirements. Metal tends to be heavier and are more expensive. In light load, low weight applications plastic/delrin can be the right choice
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