1. Ordinary small lathes have average precision. You can also choose a better second-hand lathe. For the overall dimensions of the lathe, if it is required to keep the inner hole to the size of the drawing, you need to buy a through-stop plug gauge for the hole, so that the dimensional compatibility can be guaranteed when machining the inner hole.
2. General small planer, creating keyway.
3. Gear hobbing machine and gear shaper are not required.
4. Bench type small drilling machine is used to drill fixed screw holes.
5. For electric welding machines, some films are relatively large and need to be processed after welding to save materials.
6. A self-made blackening furnace. If the sprocket is required to blacken, the cost is not very large.
7. Some sprocket teeth require quenching. In order to save cost, if the batch is large, die forging is used, and the machining allowance is very small.