After a recent visit to a cutomer and finding another very strange issue that was the result of cabling issue; I thought it would not be a waste to discuss the importance of feedback cabling.
Some key things to remember about the routing and protection of feedback cables; following these can help prevent a long period of confusion and downtime on your CNC by properly protecting and routing your cables.
1 Your cables should be routed in the appropriate conduit or track to prevent pinching or binding the cable at too samll of a radius for the cable specifications.
2 Your cables should be routed away from and protected against any high voltage lines. I would receommend although it is more expensive to have two seperate tracks or conduits that you have a track for your low voltage lines and your high voltage lines.
3 Your cables should be protected from chips and coolants that would deteriorate or cut the cable shielding. ( In a situation that there is not sufficient protection, the machine should be cleaned and freed from any chips especially in any cable tracks or runways.
Cables can cause a variety of CNC problems. I would receommend having someone with the proper test equipment evaluate any scale problem prior to replacing equipment. Linear Scales and Encoders can be very expensive components of a CNC machine. If the issue can be located in a cable the cost to repair could be significantly less if it is found to be a cable from the begining than a cable after replacing other more expensive components.
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