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10-04-2015 #11
Last Activity: 05-04-2020
The Nema 23 boss is 1.5" - so 38.1mm. It's there to allow the motor to be mounted concentrically to another shaft by machining the mount to be a close fit on the 38.1mm diameter. In the case here, there is nothing to align concentric to, so all that is required is a cutout of enough to allow the boss to fit. There's often a +-0.05mm tolerance on the boss diameter, so in the past I've machined the cutouts to 38.2mm to be on the safe side. You don't want it tight else it will be harder to tension the belt. Also the cutout for the boss needn't go all the way through the material - 2mm deep would be plenty. e.g:
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