以下几种蜗杆蜗轮型号通常被认为是较难生产但顾客又有需求的：
• 平面二次包络蜗杆蜗轮：从设计上看，需精确建立齿面模型、进行强度校核和修型技术优化等。制造方面，蜗杆需在数控车床上开齿，还常要多轴联动磨床进行齿面磨削；蜗轮则需制作专用滚刀，加工精度要求极高。检测也较为复杂，要用到环面蜗杆及滚刀测量仪、三坐标测量仪等。
• 双导程蜗轮蜗杆：其制造工艺复杂，需高精度加工设备和技术来保证两个不同导程的精度。对操作人员技能要求高，在加工过程中，要严格控制各项参数，以确保蜗杆左右齿面导程角的准确性和齿厚渐变的精度。材料选择和热处理工艺也很关键，需保证材料性能满足使用要求。
• 高精度锥蜗杆蜗轮：设计时需考虑复杂的空间几何关系和传动参数。加工时，锥蜗杆的锥形结构使刀具路径规划和切削参数控制难度大，对机床的精度和刚性要求高；蜗轮与锥蜗杆的共轭啮合要求也增加了加工难度。检测时，需用高精度测量设备对其复杂的齿形和空间尺寸进行精确测量。
The following types of worm and worm gears are generally considered to be difficult to produce but are in demand by customers:
• Planar secondary enveloping worm and worm gear: From a design point of view, it is necessary to accurately establish a tooth surface model, perform strength verification, and optimize the shaping technology. In terms of manufacturing, the worm needs to be cut on a CNC lathe, and a multi-axis linkage grinder is often used for tooth surface grinding; the worm wheel needs to be made of a special hob, and the processing accuracy requirements are extremely high. The detection is also relatively complicated, and a toroidal worm and hob measuring instrument, a three-coordinate measuring instrument, etc. are required.
• Dual-lead worm and worm gear: Its manufacturing process is complex, and high-precision processing equipment and technology are required to ensure the accuracy of two different leads. It requires high skills for operators. During the processing, various parameters must be strictly controlled to ensure the accuracy of the lead angle of the left and right tooth surfaces of the worm and the accuracy of the tooth thickness gradient. Material selection and heat treatment process are also critical, and it is necessary to ensure that the material performance meets the requirements.
• High-precision bevel worm and worm gear: Complex spatial geometric relationships and transmission parameters must be considered during design. During machining, the conical structure of the bevel worm makes tool path planning and cutting parameter control difficult, and requires high precision and rigidity of the machine tool; the conjugate meshing requirement of the worm wheel and the bevel worm also increases the difficulty of machining. During inspection, high-precision measuring equipment is required to accurately measure its complex tooth shape and spatial dimensions.
