用攻丝机攻制小螺纹时,如果工件形状特殊或较大时,工件底孔与丝锥不易放置同心,常使丝锥折断,我们采用如图的胎具,容易对正,提高质量。这种工具可根据情况制成矩形或圆形。工件放置在滑板上,可轻快游动。工件较重时丝锥能自动拨正工件,使螺纹不致攻偏。工件可用压板紧固在滑板4上或 Use tapping machine to attack the small thread, if the workpiece shape is special or larger, the workpiece bottom hole and the tap is not easy to place concentric, often taps broken, we use the figure of the tire, easy alignment, improve quality. This tool can be made rectangular or round according to the situation. Work piece placed on the skateboard, can brisk swim. When the workpiece heavier tap automatically dial the workpiece, so that the thread will not attack deviation. The workpiece can be fastened to the slide plate 4 or with a pressure plate