Jump to content

Strange Lathe Thread

jdrichard

By jdrichard
in Tools & Equipment

 Share

Recommended Posts

jdrichard Distinguished Member

jdrichard

Posted
Posted

I have a Boley Leinen Reform Lathe that has a nut that you adjust to tighten and loosen the lathe spindle bearings. The thread on the male part of the spindle shaft are flat on the top. Like the top of the mountains have been chopped off. The mating thread on the nut also has the mountain peeks chopped off. Any guess what the reason. The TAP is a 1/2” 20 TPI SAE. And i need to make a nut that is tighter fitting.

 

 

Sent from my iPhone using Tapatalk Pro

Link to comment
Share on other sites
jdrichard Distinguished Member

jdrichard

Posted
  • Author
Posted
Also, is your plan to make a lock-nut to bind the existing nut against?

Replace an the existing nut with one that binds. Almost done: Update3f31b917a9655cba8a1fc9d2e0c6f183.jpgb2c556ff6c46f3b92effb614b0c56109.jpg323e2c54ac26e6dcf9aef3ab5bad2db3.jpg34dbc14cf344fef5409a8adb67e78695.jpgFlattening the peeks
dd455a561809a6104ff4bd3796f93719.jpg9f45b7e79411a529559c3094794ac748.jpg
Still need to shave it down a bit and then cut it on one side and compress it slightly

How springy is brass and should i heat it before i compress it a bit?


Sent from my iPhone using Tapatalk Pro
Link to comment
Share on other sites
Deggsie WRT Addict

Deggsie

Posted
Posted
On 16/03/2018 at 1:16 AM, jdrichard said:

2444eb5befd09e50d2077a8cdf6a9a41.jpg
This is the start of my alternate nut that i need to complete and tap and somehow cut the peeks off the mountains.


Sent from my iPhone using Tapatalk Pro

it looks like something called a butress thread

Link to comment
Share on other sites
vinn3 Distinguished Member

vinn3

Posted
Posted
17 hours ago, jdrichard said:


Interesting. Wide thread makes it mot durable.


Sent from my iPhone using Tapatalk Pro

    well,  the point is,  it is not a simple or a common thread.  "by any other name"  it's not easy to  duplicate without a machine shop.  vin

Link to comment
Share on other sites
measuretwice WRT Addict

measuretwice

Posted
Posted (edited)
On 3/16/2018 at 6:31 AM, rodabod said:

A German lathe with an American thread?

no kidding....I'd almost be willing to bet the lathe its a 12 x 1.5 thread.   Give a 12 x 1.5 tap a try.

Acme?  Buttress?  easily identified with a straight on shot of the male thread but I'll go double or nothing on the lathe bet they're not :).  If anything it would be trapezoid because its German but the pitch is way too fine, and there is no reason for it in that application.  Afaik you don't see many buttress threads outside of collets and the odd vise screw.

Why do you need the nut tighter?  Afaik its suppose have two nuts so you can lock them, i.e. staying in its spot isn't a function of the nut being tight on the shaft.  You can't really have a nut tight on a screw, there has to be clearance or it won't turn.  If its sloppy, that means too much clearance - you need a tap with a smaller pitch dia (taps are sold for the different classes of thread fit).   But i'm betting the issues the wrong thread identification.

If you did want to make it tight on the screw, you'd have to split, pry it open slightly, then thread which you can do with a tap.  Its not really a practical solution imo....when you do have to lock a nut on a thread you do so with small set screw with a brass underneath (ala Schaublin and Aciera)

End of the day I'll bet the solution is simple - a 12 x 1.5 nut that fits much better.  Make two so its a lock nut arrangement :)

 

 

Edited by measuretwice
Link to comment
Share on other sites
jdrichard Distinguished Member

jdrichard

Posted
  • Author
Posted
no kidding....I'd almost be willing to bet the lathe its a 12 x 1.5 thread.   Give a 12 x 1.5 tap a try.
Acme?  Buttress?  easily identified with a straight on shot of the male thread but I'll go double or nothing on the lathe bet they're not [emoji4].  If anything it would be trapezoid because its German but the pitch is way too fine, and there is no reason for it in that application.  Afaik you don't see many buttress threads outside of collets and the odd vise screw.
Why do you need the nut tighter?  Afaik its suppose have two nuts so you can lock them, i.e. staying in its spot isn't a function of the nut being tight on the shaft.  You can't really have a nut tight on a screw, there has to be clearance or it won't turn.  If its sloppy, that means too much clearance - you need a tap with a smaller pitch dia (taps are sold for the different classes of thread fit).   But i'm betting the issues the wrong thread identification.
If you did want to make it tight on the screw, you'd have to split, pry it open slightly, then thread which you can do with a tap.  Its not really a practical solution imo....when you do have to lock a nut on a thread you do so with small set screw with a brass underneath (ala Schaublin and Aciera)
End of the day I'll bet the solution is simple - a 12 x 1.5 nut that fits much better.  Make two so its a lock nut arrangement [emoji4]
 
 

I think i found the final solution



Sent from my iPhone using Tapatalk Pro
Link to comment
Share on other sites
jdrichard Distinguished Member

jdrichard

Posted
  • Author
Posted
no kidding....I'd almost be willing to bet the lathe its a 12 x 1.5 thread.   Give a 12 x 1.5 tap a try.
Acme?  Buttress?  easily identified with a straight on shot of the male thread but I'll go double or nothing on the lathe bet they're not [emoji4].  If anything it would be trapezoid because its German but the pitch is way too fine, and there is no reason for it in that application.  Afaik you don't see many buttress threads outside of collets and the odd vise screw.
Why do you need the nut tighter?  Afaik its suppose have two nuts so you can lock them, i.e. staying in its spot isn't a function of the nut being tight on the shaft.  You can't really have a nut tight on a screw, there has to be clearance or it won't turn.  If its sloppy, that means too much clearance - you need a tap with a smaller pitch dia (taps are sold for the different classes of thread fit).   But i'm betting the issues the wrong thread identification.
If you did want to make it tight on the screw, you'd have to split, pry it open slightly, then thread which you can do with a tap.  Its not really a practical solution imo....when you do have to lock a nut on a thread you do so with small set screw with a brass underneath (ala Schaublin and Aciera)
End of the day I'll bet the solution is simple - a 12 x 1.5 nut that fits much better.  Make two so its a lock nut arrangement [emoji4]
 
 

So i could buy a 12x1.5 nut, correct? And cut it and make it sprung. The nut hole is a 29/64 inch prior to taping.


Sent from my iPhone using Tapatalk Pro
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • Stirky
      Diagram for 6497 motion works

      By Stirky · Posted

      Thanks Jon.
    • Jon
      Diagram for 6497 motion works

      By Jon · Posted

      Great diagram with the teeth and pinion count. Simple way to reduce the speed of the hour wheel by the 12:1 minute wheel. Genius and yet so simple. Always good to reinforce the principal by what you have done in your drawing. Keep doing that. I had a drawing on my wall for years showing me this which is very similar to the drawing you have done. Here's a formula to work out the beats per hour of a watch movement. The movement's BPH is dictated by the wheel teeth and pinion count and the hairspring being vibrated to the correct BPH by finding the pinning up point on the hairspring using a vibrating tool.  The reason in the formula there is X2 on the top line is because there are two pallet stones.
    • DDean
      Incabloc Lyre Spring & Low Earth Orbit

      By DDean · Posted

      So I just wanted to say "thank you" again.  The angle is the key bit it seems and yes, it did basically just fall, or float, back into position when I got it lined up just right.
    • transporter
      Commando special

      By transporter · Posted

      Well I’ve never seen the make before and cannot find any info, I haven’t got it just yet it’s been left to me among a 1970’s sea master and a mid size yeoman. But if anyone has any information on this one please feel free to enlighten me, many thanks 
    • Stirky
      Introduction

      By Stirky · Posted

      Hello Horologists, thought I'd introduce myself. I'm a 50ish year old who has been dabbling in watches for a while, did a couple of BHI course here in the UK and have started to dabble at bit more. I also took the level 1 course, which was a good refresher. Now off to look at some Bergeon tools and then buy (and regret buying) the cheaper ones...    Stirky.
×
×
  • Create New...