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The top two pictures of the gracesguide.co.uk page show a screw originating machine, not a screw cutting lathe. And that's the machine you need. AIUI, it's use
by mauvehaus 6y ago
The top two pictures of the gracesguide.co.uk page show a screw originating machine, not a screw cutting lathe. And that's the machine you need.
AIUI, it's used to cut a lead screw in relatively soft material by holding a cutting tool to it at an angle. Once you have that, you can generate a screw in harder material from it (carefully, one has to assume).
- petertodd 6y agoAh, I see what you mean. I was aware of those machines. But IIUC they by themselves don't generate accurate enough screws, as the blade doesn't track the material exactly, so errors build up over the length of the screw. Getting those errors out in subsequent generations of screws is the hard part.
- yetihehe 6y agoYou can average out errors over thread by repeately sliding a long nut over your screw while using lapping compound. Each part of nut will contact only highest (in direction of travel) parts of thread and slightly cut them. You will need to cut off about the same length as nut from both ends of your screw. Nut will have to be made from two parts so that it can be slightly tightened on rod.