C620-1车床车螺纹时,由于纵拖板齿轮间隙和手轮的偏重,往往使螺距不均,误差较大。我们参照B650压紧手柄装置,将其装于纵向拖板手轮里侧(附图),车螺纹时压紧手把,车其它部位时,将压紧手把提起转90°,插入另槽,保证了螺纹精度,又不影响机床原型,简单易行。 C620-1 lathe thread, due to the vertical carriage clearance and hand wheel hand wheel bias, often lead to uneven pitch, larger error. We refer to the B650 compression handle device, which is mounted on the inside of the longitudinal pallet wheel (with photos), the hand thread when pressing the handlebar, other parts of the car, the handle will be pressed to turn 90 °, insert slot , To ensure the thread accuracy, without affecting the prototype machine, simple and easy.