Assembled chamfer mill

An assembled chamfer mill, configured to chamfer a workpiece, comprising:

• a tool holder, having an end formed with a tool holder inner taper hole and a tool holder inner screw hole extending inwardly from the tool holder inner taper hole;
• a chamfer bit having opposing first and second ends, the first end having a cylindrical hole formed therein and the second end having a chamfer bit inner taper hole formed therein and in open communication with the cylindrical hole of the first end, the chamfer bit having a taper top adjacent the first end and a plurality of radially extending upper and lower blades disposed in angular spaced relationship, the chamfer bit being connected to the tool holder, the taper top being fitted with the tool holder inner taper hole, the cylindrical hole and the chamfer bit inner taper hole being in open communication with the tool holder inner taper hole and the tool holder inner screw hole;
• at least one extension shaft including a shaft body, the shaft body having a length selected to be in correspondence to a thickness of the workpiece, a first end of the shaft body being sequentially formed with an extension shaft taper rod, a guide post, and a screw rod extending therefrom, and a second opposing end of the extension shaft being formed with an extension shaft inner taper hole and an extension shaft inner screw hole extending inwardly from the extension shaft inner taper hole;
• at least one second chamfer bit having opposing first and second ends, the first end thereof having a cylindrical hole formed therein and the second end thereof having a chamfer bit inner taper hole formed therein and in open communication with the cylindrical hole of the first end thereof, the at least one second chamfer bit having a taper top adjacent the first end thereof;
• a screw bolt having a screw bolt taper rod at one end thereof and a screw thread extending therefrom, the screw bolt being inserted into the chamfer bit inner taper hole and the cylindrical hole of one of, the chamfer bit or the at least one second chamfer bit, and the screw thread thereby being correspondingly engaged with one of the tool holder inner screw hole of the tool holder or the extension shaft inner screw hole, and the screw bolt taper rod is thereby fitted with the chamfer bit inner taper hole of one of, the chamfer bit or the at least one second chamfer bit, thereby locking a corresponding one of the chamfer bit or the at least one second chamfer bit;
• wherein the extension shaft taper rod, the guide post, and the screw rod of the at least one extension shaft are inserted into the chamfer bit inner taper hole and the cylindrical hole of the chamfer bit to engage the tool holder inner screw hole, the screw rod thereby being locked into the tool holder inner screw hole, the guide post thereby being fitted with the cylindrical hole of the chamfer bit, and the extension shaft taper rod thereby being inserted into the chamfer bit inner taper hole of the chamfer bit;
• the at least one second chamfer bit is connected to the at least one extension shaft, the taper top of the at least one second chamfer bit is inserted into the extension shaft inner taper hole, and the cylindrical hole and the chamfer bit inner taper hole of the at least one second chamfer bit are in open communication with the extension shaft inner taper hole and the extension shaft inner screw hole of the at least one extension shaft, and the screw bolt is inserted into the chamfer bit inner taper hole and the cylindrical hole of the at least one second chamfer bit, the screw thread is engaged with the extension shaft inner screw hole of the at least one extension shaft, and the screw bolt taper rod is thereby seated in the chamfer bit inner taper hole of the at least one second chamfer bit, and the at least one second chamfer bit thereby being locked to the at least one extension shaft.