I had some fun at the machine shop today.

[Snattlerake]

One end has to be removable. Logic deduces it. Physics demands it.

 

[Shadowrider]

I'm going with you unscrew the two piece male threaded rod and put the nut on one, then screw the rod back together.

 

[Profreedomokie]

The inner thread is LH.

 

[Snattlerake]

The inner thread is LH.View attachment 248963

I see what got you to post this. The above machining of the two parts is so precise the surfaces that mate are invisible.

I watched a video from Suburban Tool years ago that showed the machining was so precise on two gauge block cylinders the color of the light he showed in between the cylinders was changed from white to blue because the gap would only allow blue light to shine through. I wish I could find that video.

 

[SoonerP226]

They make blocks out of ceramic too for the really precise stuff.

Adam Savage has a set of Mitutoyo ceramic gauge blocks that they gave him for something he did for them. He showed them on his YouTube channel recently, and he wrung a few of them together. I saw a science presenter (maybe Steve Mould) talking about wringing gauge blocks a few months ago on his YouTube channel, but I don't recall what the explanation was.

ETA: here's Savage's video.

 

[SoonerP226]

More on wringing:

 

[Profreedomokie]

I see what got you to post this. The above machining of the two parts is so precise the surfaces that mate are invisible.

I watched a video from Suburban Tool years ago that showed the machining was so precise on two gauge block cylinders the color of the light he showed in between the cylinders was changed from white to blue because the gap would only allow blue light to shine through. I wish I could find that video.

I would like to see that also. I used to rebuild mechanical seals and we used light waves to gauge the flatness of the seal faces.

 

[Snattlerake]

I would like to see that also. I used to rebuild mechanical seals and we used light waves to gauge the flatness of the seal faces.

Here is their Youtube page. I really enjoy Don,
https://www.youtube.com/channel/UCrUM7Q29YDCs-zDrc1QRKQQ

 

[JeffT]

Nope. But warmer.

It was 2 shafts, so I was half right… the story of my life!

 

[Jack Shootza 50]

Might be an optical illusion, but I'm going with what I think is obvious just from the pic. the majors on the thread on the left are less, allowing the nut to slide over that end. Barring that, I'd guess a staked nut after it was put on.

My guess also