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How to Distinguish Between Refurbished and Original New Juki Motors: A Detailed Guide
When dealing with high-precision SMT machines, such as those from Juki, ensuring the quality of motors is critical for operational efficiency and longevity. Refurbished motors often present unpredictable performance, which can negatively impact production lines. Here’s how you can distinguish between refurbished and original new Juki motors by focusing on three key points:
- 1
Examine the Surface Finish of the Motor Body
The first inspection point is the body surface, particularly around the area highlighted in the image (red line). Refurbishers often cut off a thin layer or polish this section using a CNC machine to ensure the cut surface is smooth. However, this process also removes the original plating layer. In contrast, an original new motor will have no traces of cutting or polishing, preserving the integrity of the surface plating. Carefully check for any signs of refinishing that could indicate refurbishment.
- 2
Inspect the Cross Sections for Screw Marks
The second and perhaps most crucial area to check is the cross sections highlighted in the red circles in the image. When motors are removed from a machine for refurbishment, screw marks inevitably remain due to the tightening process during the initial installation. These marks are typically deep and hard to eliminate completely. Refurbishers might grind down these sections to reduce the appearance of screw traces, but this process will usually leave grind marks or create color differences compared to the untouched areas. If you notice such inconsistencies, the motor is likely refurbished. Original new motors, like the ones in the provided example, will show no such signs of grinding or screw marks. - 3
Check for Cable Tie Marks on the Wiring
The third inspection point is the motor’s cables, specifically in the areas indicated by the red circles. When motors are installed in machines, the cables are typically secured with zip ties. In refurbished motors, these ties leave indentations or marks on the cables that are difficult to remove completely. Even after refurbishing, the traces of cable ties will often remain. If you detect any binding marks, it is a clear indication that the motor has been used and refurbished. Original new motors will have no such cable tie traces, maintaining a pristine condition.
