Jump to content

Trying to identify some 8mm ring and step collets...

nw10
 Share

Recommended Posts

nw10 New Member

nw10

Posted
Posted

Hi,
I bought a Boley 8mm lathe on eBay which came with some ring and step collets but unfortunately they don't fit the lathe. Judging from appearance they may be from 2 different manufacturers. They don't have a makers name and I hope they will look familiar to someone?
Thank you.

20210602_132654.jpg

20210528_200958.jpg

20210528_201721.jpg

LittleWatchShop Distinguished Member

LittleWatchShop

Posted
Posted (edited)

How is that they do not fit?  Do they not fit at all into the spindle?  Do they fit in the spindle, but only so far?  Do they fit all the way into the spindle but do not interface with the draw bar?  Do the threads fit the draw bar when outside of the spindle? Can you show a measurement of the diameter of the collet?  Is there a key in the spindle but it is too wide for the key clot?  Have you fit a standard collet into the spindle?

My computer does not work.  What is wrong?

Edited by LittleWatchShop
HectorLooi Distinguished Member

HectorLooi

Posted
Posted

I've come across a few ways that a collet might not fit.

The collet might be the "long" type, where after tightening the drawbar all the way, it's still loose. This can be solved by putting washers on the drawbar until the collet can be tightened.

Another way is the collet is too short that the drawbar cannot engage the threads. It might be possible to lengthen the drawbar or buy a longer drawbar.

Thirdly, the threads might not fit. I'm aware that China made lathes use a different thread pitch for their lathes. Although it's also 8mm, they won't fit a WW 8mm lathe. I'm not sure if buying a China made drawbar will solve this problem.

Good luck!

  • Like 1
nw10 New Member

nw10

Posted
  • Author
Posted

Thanks both.

One of the step collets is just too big to fit into the headstock. It measures 7.8mm diameter at the level where the slot starts compared to 7.75mm at the same place for the Boley.    

The other 2 step collets fit into the headstock but the drawbar / spindle only will only tighten half to one turn. The screw gauge on both collets is 40 Whitworth (same as a Boley collet). But the external diameter at the threads is 6.99mm compared to 6.83 of the Boley.

Maybe a Chinese drawbar would work. I tried looking on ebay but could not find one...

nw10 New Member

nw10

Posted
  • Author
Posted

Great thanks. Also if you search 'adjustable drawbar' there is Chinese one with a metric thread one end and WW thread the other end.

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

    • caseback
      A lathe with indexing that won't break the bank?

      By caseback · Posted

      I believe @nickelsilver has a setup like that.
    • LittleWatchShop
      A lathe with indexing that won't break the bank?

      By LittleWatchShop · Posted

      I posted pictures earlier in this thread. My lathe and mill are two separate instruments. I think I have seen examples of putting a milling head on a lathe bed...but not certain.
    • Rocco
      Watch of Today

      By Rocco · Posted

      Timex Camper, September 1994, new to me. Strap is an old perlon with "Germany" in script etched into the resin on the tail end. Not Horlon or Eulit I believe. History unknown, running strong, losing less than a minute a day. Goals for this: Wear it a ton! Buy crystal lift, clean out the gunk around the ring and under the crystal Eventually swap into a stainless steel case. I've seen a member who has swapped a Timex mechanical movement into the Timex J.Crew quartz field watch case.
    • JohnR725
      A lathe with indexing that won't break the bank?

      By JohnR725 · Posted

      One of the problems we would have with a watchmaker's lathe is they were made over considerable span of time and manufacturing in the early days probably wasn't as good as it was today. Then if you look at the older catalogs typically it was just the head a few collets and something to rest graver on. So basically a basic lathe with over time things acquired but acquired things may or may not fit. Order today you purchase a used lathe that all kinds of nifty bits and pieces from a seller that acquired from? This would come back to that the basic watchmaker's lathe was used for basic watchmaking like turning things with a hand graver. Then limited indexing is fine because you can make things like stems Which don't need a whole bunch indexing   In the link above the word vector is mentioned and at the link below you can purchase one. Then of course you're going to need the motor that's a little bit extra for the price. https://www.hswalsh.com/product/lathe-vector-watchmakers-48-collets-hl11. That you're going to need some bonus parts like these found this picture online show the classic way of classic gear cutting.   The lathe could have a much bigger indexing disk but it has to be mounted close to the edge. Otherwise you're going to have a whole bunch of smaller disks like this which I think has notches rather than holes. Then as wonderful as these pictures look actually cutting a gear with this is not entirely fun. Look at all is belts all pulling on things and this is a watchmaker's lathe lightweight with lots of bits and pieces attached. It would make more sense if you actually cut a gear with something like this and it tends to be it's not really the best way to do it looks nice on paper but it is not the best way to go. Reality for cutting watch parts would be a bigger machine is much better. Than getting rid of all those belts and pulleys also good. Here is an interesting channel I would've liked of found a different video but this was nice and short if you look at his video as he uses a stepping motor and worm gear assembly for the indexing plate. In this particular video it gets attached to the lathe at about one minute and seven seconds and it looks like it's hiding looks like he has a Sherline. I do know he's had other stuff you'll just have to go through his videos to find it. Then at about one minute and 22 seconds you find out if you set up things appropriately. It's always bad we end up with half a tooth at the very end. Then you will note big lathe yes he's getting a big gear but you could easily cut a watch gear with the setup. And it definitely way more stable than a watchmaker's lathe.         Oh here's a company they been in business since 1911 http://www.fwderbyshireinc.com/  
    • RichardHarris123
      Hello from the Philadelphia area

      By RichardHarris123 · Posted

      Hello and welcome from Leeds, England. 
×
×
  • Create New...