Quote Originally Posted by Jonas View Post
So my question is.
How close to the table does the collet nut have to go? Right now I have 20 mm.
It of course depends on the tool and what is to be cut. But lets say you want to cut 3 mm aluminum plate with 3 mm tool? How long is a normal good stick out? I can see that some tools are 50 mm long and have cutting of ~12 mm. I have no idea how much tool will fit into a 2,2 kW Chinese spindle.
Well for the very best stiffness you should have the least amount of stick out as possible but this will vary with flute length and coatings so no one but you can answer that question really.?
Why coatings.? Many tools have a coating that usually goes past the flute or cutting length, this then becomes your limiting factor because you don't want the coating in the collet otherwise the tool can slip due to the fact the collet is only gripping the coating portion rather than the whole shank.

The length that will go into the 2.2Kw spindles can vary from supplier to supplier, I've had some with the shafts bored very deep and others where they are only 30mm. The one we fit now will take about 50-60mm I believe.? I will get a spindle off the shelf and measure tomorrow.!

Also, note that if you are using the WC 2.2Kw round type spindle you can always slide it up to down in the holder if required.!