1/2" ER20 Collet for Spindles

Can your water cooled spindles accept 1/2" collets?

Yes, our 2.2kW water cooled spindles can accept the 1/2" collet size.

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.

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.

How do you remove the collet on the 2.2 kW spindle? It seems to be a part of the retaining nut.

You'll need to twist and pull the collet while also canting it side to side until it comes free from the nut. It is not actually attached to the nut it just takes some jiggling to separate the two.