A system for inserting and removing cutting inserts of a cutting tool includes a first processing device, a second processing device, and a controller coupled to the first processing device and the second processing device, wherein the first processing device includes a gripping element for holding or securing a cutting insert, wherein the second processing device includes a fastening tool for fastening or releasing a fastening mechanism holding the cutting insert, and wherein the control is adapted to control the first processing device to hold the cutting insert, to control the second processing device to fasten or release the fastening mechanism when the cutting insert is held.

Provided is a spindle, a router device, and a cutting bit. The spindle may include: a spindle body having an internal space; a rotary shaft in the internal space, and having a receiving space configured to receive one end of a cutting bit, the cutting bit including a plurality of fastening portions spaced apart from each other in a longitudinal direction of the cutting bit and a plurality of cutting portions disposed between the plurality of fastening portions and configured to cut a substrate; and a support head at one end of the spindle body, and including a collet connected to one end of the rotary shaft and configured to selectively fasten at least one fastening portion among the plurality of fastening portions.

Provided is a spindle, a router device, and a cutting bit. The spindle may include: a spindle body having an internal space; a rotary shaft in the internal space, and having a receiving space configured to receive one end of a cutting bit, the cutting bit including a plurality of fastening portions spaced apart from each other in a longitudinal direction of the cutting bit and a plurality of cutting portions disposed between the plurality of fastening portions and configured to cut a substrate; and a support head at one end of the spindle body, and including a collet connected to one end of the rotary shaft and configured to selectively fasten at least one fastening portion among the plurality of fastening portions.