CNC router collet & chuck sizes (specs)

Hello,
I was wondering about the collets used on the automotion cnc router. Are they “ER spring style”? If so what other sizes would fit into the motor (Spindle motor thread size and pitch)? I might pick up some if necessary.

Thanks,
Craig

The woodshop cnc spindle uses ER type collets. See the attached photo for the sizes available.

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