对于某些直径和螺距較大的单头或多头螺紋,若能以銑削代替車削,則不仅效率高、質量好,而且还能减輕工人的劳动强度。但由于一般工厂多不具备专用性較强的螺紋銑床,从而使这一較为先进的螺紋加工方法难以得到采用和推广。我们为一台C618車床設計并制造了两套能分別与机床的从动皮带輪和中拖板相互置換的装置,可随时将这种通車床变为能銑制螺紋的 For some single-head or multi-head threads with larger diameters and pitches, milling instead of turning is not only efficient and of good quality, but also reduces worker labor. However, due to the general factory do not have a more specialized thread milling machine, so that this more advanced thread processing method is difficult to be used and promoted. We designed and manufactured two sets of units for a C618 lathe which are mutually interchangeable with the driven pulley and the carriage of the machine, making it possible to turn this lathe into a thread that can be threaded at any time