Summary:...
1. Gear: No cracks and burrs can appear on the surface of a good quality gear, and there can be no glue scars and pitting scars.
2. Needle tooth shell: the material of the needle shell is required, and the material should not be too low, and it can be artificially aged.
3. Output shaft: The output shaft and the shaft neck position cannot have any shortcomings, such as cracks, burrs, scratches, etc., which are relatively obvious defects. A good quality output shaft does not have these defects.
4. Rotating arm: The deviation of the eccentricity should be controlled within ±0.02mm.
5. Machine base: There should be no obvious cracks or blisters on the base. The joint surface with the pin teeth should be smooth and flat, and at the same time, it can be assembled tightly.
6. Needle gear sleeve: The surface of the needle gear sleeve and the pin should be free of scratches, cracks and burrs. Similarly, there should be no defects such as glue scars.
7. Skeleton-type rubber oil seal: The edge of the oil seal should be smooth, to ensure sufficient radial force after opening, the material is soft and has good elasticity, and the oil seal should not be cracked or aging.
8. O-shaped sealing ring: The size should be accurate, and the surface should be smooth without cracks.
9. Sealing gasket: The surface is smooth and flat, without flashing and burrs.
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bldc gear motors 
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