Jump to content
Tmuir

Barrel ID Measuring tool

Recommended Posts

It's time to get back to working on my Fusee clock and finish the new barrel for it.

Although I could manage without making this tool I decided it was worth making to ensure I get the endshake correct.

I wanted to measure the distance between the bushes inside the clock barrel and obviously you cant use a vernier for that.

That's where this tool comes in.

1699184168_barrelmeasuretool.jpg.a0c8bb786954dfb504bae640edf13117.jpg

Its a pretty simple tool. The threaded rod is a 6BA steel threaded rod I had lying around and I turned up 2 brass ends. The one on the left is only threaded for about 10mm and the rod is screwed and Loctited into it. The one on the right is threaded for the first 10mm and then just clearance drilled the rest of the way. I did this as my taps are not long enough to tap the whole length.

The shoulders of the brass ends are 7.5mm diameter with the narrow parts 5.5mm diameter. The idea is this can be used on any barrel that the pivots are larger than 7.5mm.

Before I get onto how to use it I will quickly show how I tap small threads like this.

The picture below shows my lathe fitted with a drill chuck in the tail stock and held in the drill chuck is a steel rod that I drilled and reamed to give it a smooth bore.

I then turned up the tap holder with the shank to the size its a nice smooth fit into the bore. The end of the tap holder is drilled to be a good fit on the tap shank size, knurled to give you some grip and then a grub screw hole is cross drilled and tapped and a grub screw fitted, so when you slide in the tap the grub screw is tightened up on one of the flats of the square on the end of the tap.

The drill chuck and reamed tube hold the tap in line for tapping and as you screw the tap in by hand it slides in the tube so no stress is put onto the new threads being cut. You can obviously also use this in a drill press.

1548185752_barrelmeasuretool2.thumb.jpg.a6fe5f93dae41ae4c8c3bdb8e8aee13f.jpg

A closer shot of two tap holders and the sleeve, they are each made for different size tapstap_holder6.jpg.72085d592e77843d743a41cc21d5a9a1.jpg

Measuring tool in use.

The shoulder of the left side is sat against the shoulder of the bush inside the barrel and the other brass end is gently wound out until it is touching the shoulder of the other bush, then the 6BA nut is done up against it to stop it slipping, you then remove it from the barrel and use your verniers to measure the gap between the shoulders on the measuring tool. I can now ensure that my new barrel will have the same amount of endshake as the old barrel, yes I could of worked it out without making this tool, but its always fun making new tools.

765202650_barrelmeasuretool3.jpg.138831210c8f2c4b83f0fe4da135403d.jpg

 

Share this post


Link to post
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.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  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.

Loading...

  • Recently Browsing

    No registered users viewing this page.

  • Topics

  • Posts

    • I'm Malcolm and from New Zealand and I have a small collection of watches 
    • Hi there, I have inherited this box lot of watch stems, please could anyone be able to decipher the numbers written on the packets please, some I can find using google but I am not sure of the way I need to describe them , thank you...  I am not using this site for selling purposes … just to gather information from anyone who might be able to help...  and also check out my large glass advertising piece … I am from new zealand
    • Just googled dial washer and the first part is definitely a dial washer - not sure if I need it though. I will struggle to photo the other part it is so small - I am of out now will have a go later today.  It is only about .5mm thick.  I was wondering if it is some sort of strap to secure the movement in place.
    • Hello everyone. This is my first proper post here I hope someone can help me to identify this "issue". I have a Vostok watch from the 80's with the 2409 movement. It keeps good time (within 3 seconds a day). Beat error is 0.1 ms and the amplitude fluctuates between 240° and 265° depending on the position. The issue with the watch is that I hear a strange sound that only goes away when losening the balance cock screw. As soon as the screw starts putting the minimum amount of pressure to the balance cock the strange sound begins. Currently I don't have the proper tools to handle the movement aside from proper watchmaker's screwdrivers so I cannot take out the balance cock assembly to check if something seems off. I have attached two audio files, the first one with the balance cock screw properly tightened. The second one with the balance cock screw lose. Excuse the poor quality audio but is the best I could do with what I have available.   Hopefuly someone can help me identify this issue. 2409 sample 1.wav 2409 sample 2.wav
×
×
  • Create New...