We have a Hyundai Hit 8S CNC lathe that won't go above about 3500 rpm. I set the speed on the Siemens controller and hit the start button with the chuck closed and it goes real close to what I set the speed at, except it won't go above about 3500 rpm. I tried 4000, 4500, 5000 and 6000 rpm and still did not go above 3500 rpm. Is there a rpm limit I need to undo on the controller? thanks.
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