A Simple Lathe Project - The Captive Nut - ASMR Machines - Relaxing - Alu & Brass - BestLathePlans
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- Опубликовано: 19 май 2020
- Another simple project for the metal lathe is the Captive Nut. This can help you improve your lathe skills and also will make use of the Screw-Cutting feature of your lathe.
This project is made up of 3 parts:
- Threaded Core Part A - Aircraft Aluminium 6081
- Threaded Core Part B - Aircraft Aluminium 6081
- Threaded Nut - Brass
You can pick the external visible thread from what is best for your lathe. I went with an imperial, 3/8 x 32TPI, as my lathe is setup for imperial screwcutting. 3/8" ~9.3mm OD
If your lathe is metric, any M-Thread would work. Probably around M8 - M10 would give a nice overall build size.
I also had the threaded join in the center part of the overall build, meaning that the join is actually in the threaded part of the Core. You could instead put the join more at either end. Whichever works for you best. However, if you make the Core components oversize until you join them, you can then machine them as a single unit, making all the sizes uniform and square.
NB, don't use Loctite at this stage though, as you will need to disassemble the unit to add the nut once they are both finished and threaded.
I went with Aluminium 6081 and Brass, as that was in my stock draw.
The Brass Hex bar used was 12mm diameter. The Aluminium bar was 20mm bar, which I reduced down to 16mm diameter. Again, any size would do. Also, if you don't have any Hex bar, a round nut would also work. If you have a knurling tool, that would also give a really nice finish also.
The two Threaded Core parts are threaded together with a thread ~0.5xOD (Outside Diameter) of the outer visible external thread for the nut. The internal thread can be anything which matches your tools. I threaded using a tap and die, and went with an M4 standard pitch thread, as they were to hand, and within the size range I was looking for.
Once you have finished the project, you can use Loctite 603 to hold everything together.
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Video recorded, edited and annotated by Best Lathe Plans.
Disclaimer:
I am a hobby machinist and any information in these videos is of my own personal journey. I take no responsibility for viewers, or how they use their machines.
Lathes and many of the power tools used in these videos can be dangerous if not used properly.
Please consult your manual, and operate your tools safely and responsibly.
Stay safe, and happy machining.
Private video. Do not copy or replicate. 
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How did the bead inter in???!
how did you cut the threads in the nut? Tap, or lathe?
Good question! I cant believe that didnt end up in the final edit. Apologies. I used a tap. I was waiting for my small internal threading boring bar at the time.
how do I get a captive nut puzzle I have looked for one.
Where abouts are you? E.g. Country/State. I think a few people on Etsy do them, but I've no idea on prices. They'd be a good few hours work.
@@BestLathePlans hi me John again this is about your captive nut.
I live in the United Kingdom I don't see the captive nut around I know
they must cost a lot.
I'd like to know the price of one Thanks
how did you inserted the brass nut.......THAT was the mystery part. You dont show how......thubs down sorry....
Looking at how ge made the puzzle it's basically self explanatory, he unscrewed the main part, put the nut on and then screwed both parts together to end up with a "captive nut"
Hey @Erik Klaus, yep that's exactly how it was done. For those wondering, I also forgot to include the thread cutting for the nut. I think I lost that footage before doing the editing. I used a Tap to cut the matching female thread.
@@erikklaus3937 that's a common sense reply but the fool that asked the question has a vacant spot in his head where is brain should be
Why would anybody make a video like this?
For your entertainment obviously! Ha. :)