I am a total newbie to milling equipment but have been using woodworking and electronics for a while. Building a CNC machine that will be used both for milling and woodworking. I already have a high quality brushless motors and below is the design I came up with. The major problem is figuring out how to connect ER20 chuck to the ball-bearing spindle (rod) that will be driven by the motor. These chucks mostly come with a tapered collets that I cannot connect to easily. Is there a type of collet that would be feasible for my application? Is there a collet that already has ball-bearings and is ready for the belt-driven application below or would you recommend a totally different approach?

I know I can get a solution (contraption) that will help accomplish this for several hindered dollars but I was looking at a more cost-effective solution. It is just very difficult to find non-tapered collets and their detailed descriptions and hope you can advice a practical solution. thanks.

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