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Question #: 11161

Question: I purchased a 220V spindle with invertor last week and the ER20-A Clamping nut appears to milled incorrectly. I installed the spindle for the first time last night and was unable to screw the nut any distance with a bit inside. Looking inside the nut, there is a machined ring that is visibly off center.

Current Solution

The ring inside the nut is purposely machined in this way to allow movement for the collet. Try threading the nut counterclockwise a little bit until it seems to be flush on the spindle extension. This should ensure the collet nut will thread correctly without stripping the threads on the pipe.

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