“The motor winding assembly, which is less than 25 mm diameter,will be inserted from the left of the case, and all the way intothe ø32 mm x 8 mm counterbore. The winding assembly will onlycontact the peripheral surface of the ø25 mm x 3 mm counterbore.That is, this counterbore must have limited runout with respect tothe main reference defining the motor case axis of
symmetry. It was decided that a runout tolerance of 0.05 mm,regardless of feature size, should be applied to this section ofthe hole, and to all sections requiring runout specification. Thefit between the winding assembly and this ø25 mm x 3 mm counterboreshould be a tight slip fit. This will allow the motor winding to beinserted easily, without potentially damaging force.
The ø32 mm x 10.5 mm hole section next to the 1.5 mm deepspotface must accept a ball bearing of similar size. This bearingwill support the shaft to be rotated by the motor. As is commonwith bearings, this bearing must have a press fit against the hole.It is important to hold this section of the through hole to acylindricity of 0.05 mm, and finish its surface to a roughness of250 nm.”
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