Features: 1, It utilizes compressed air as energy source and pneumatic motor as driving power, and the driving blade-plate with low rotation speed and large torque after deceleration. 2, The inner diameter of the pope is expanded tightly by inner expanding block, and the machine can run after self-setting of the pope centre. 3, The groove blade has automatic feed device and the feed within the range of 0-45° . 4, The machine can make grooving, chamrering and edge-chamfering to V and 5, U type soldering seam of the pope, . Also it can operate the functions of grooving and lathing to the welded flange plane...Model TCM-28 TCM-80 TCM-150 TCM-250-1 TCM-630-1 TCM-250-2 TCM-351-2 Cutting range Φ 16-28 Φ 28-80 Φ 65-159 Φ80-273 Φ150-351 Φ300-630 Φ80-273