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4-40 is bigger than what I normally use. For the triples I am making my own they are equivalent to your 3-56's. The smallest bolts I have made were 16BA which is the same sort of size as your 000-120. What is nice about making your own is you get a nice unthreaded shank with just the right amount of thread There must be an on line model engineer supplier in your country that will do you what you need. In the UK I would point you to EKP .Jo
4-40 is bigger than what I normally use. For the triples I am making my own they are equivalent to your 3-56's. The smallest bolts I have made were 16BA which is the same sort of size as your 000-120. What is nice about making your own is you get a nice unthreaded shank with just the right amount of thread Jo
There must be an on line model engineer supplier in your country that will do you what you need. In the UK I would point you to EKP .
I've never heard of 000-120. I know watchmakers use very small threads, but I don't know what they are. Do you thread your 000-120 with a die or a threading plate?
But Mr Silky reminded me that he is more than capable of threading down to 250 Tpi
250 TPI is a threading rate not surfacing. Jo
What would be the thread depth on something that fine?
250 TPI is a threading rate not surfacing. I thought the Warco machines only went down to 80 Tpi .Jo
..............but I thought that all lathe work cut a spiral...............
It depends if you have ground your tool for cutting a thread with a flat crest or sharp
Quote from: Jo on March 12, 2016, 08:14:13 AMIt depends if you have ground your tool for cutting a thread with a flat crest or sharp Cutting the external threads is easy enough; it's grinding the boring too to do the internal thread of that LH 17BA nut that gets a bit tricky...AS
I expect all the ones you have ordered will be larger hex than American Model Eng as they are the modern mass produced ones. I too have a supply of these as they are ones supplied with various models that just look horrid so I substitute them with something more in keeping.
I will not buy any hex fastener for model work that does not list the AF hex size. The thread I linked is sources of model hex bolts or other small useful small fasteners.The selection is not as good at Microfasteners but they do stock a selection of small pattern hex nuts and bolts and they do list the hex size so you know what you will be getting.Here is the choice of small pattern SS nuts:http://www.microfasteners.com/small-pattern.htmlDan
Was that a Typo ?as 27BA would be nearer to Jo's 250tpi
17BA is 149 1/2 TPI, but for some reason that is not a standard pitch for Mr Silky .
All the ones I purchased have the AF measurement listed, I just don't believe the measurements.Here's one example for 1-64:http://www.amazon.com/gp/product/B009EEX2G2?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s01It lists the AF width as 3/64.American Modeling lists hex used as 7/64 for 1-72.
So then Jo if I set a feed of 0.002 inches will I cut a 500 tpi thread assuming my eye sight and quorn can grind the tool bit be interesting to use the thread dial
Yes Mr Silky has one of those and six different positions for thread starting. Not that I can think why you would want a six start thread
Here's one example for 1-64:http://www.amazon.com/gp/product/B009EEX2G2?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s01