Jump to content

Lathe Dead-Centre Collet Taper

rodabod

By rodabod
in Tools & Equipment

 Share

Recommended Posts

rodabod Distinguished Member

rodabod

Posted
Posted

Hi,

Does anyone know if it was a standard taper that was typically used for 6mm and 8mm dead-centre collets on watchmakers lathes? Morse Taper maybe?

I wish to mount a Jacob’s chuck on mine by turning an arbor for the drill chuck. So far I have turned a small section of brass to get an idea of the dimensions. I ended up with a 10mm arbor with a large end of 4.4mm tapering to 4.2mm at the smaller end. I adjusted the taper by using ink to highlight the high points when fitting, but I’d rather use a cross-slide to cut an exact known taper.

 

A9EA1096-E0DD-4AEF-94A0-E119B3D492C4.jpeg

Link to comment
Share on other sites
khunter WRT Addict

khunter

Posted
Posted

From what I have read each maker used their own "standard", I measured mine when I got it (a Boley clone), it measured 4mm to 3mm over a 17mm length. Doing the math on a cad program it gave me something like 1.7 degrees included angle. The way you are doing it is about the only way to get it to fit your particular lathe. There's a video somewhere on YouTube where the guy is doing exactly how you are for the same purpose. 

  • Like 1
Link to comment
Share on other sites
rodabod Distinguished Member

rodabod

Posted
  • Author
Posted

Thanks. I've tried doing that methodically, and the Jacobs chuck fits solidly, but is not completely true depending on what angle it enters the collet.

I think I may turn a straight arbor for the chuck and then mount in the largest collet I can find, eg. a 6mm collet, as I reckon this would turn truer.

  • Like 1
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

    • rehajm
      Vertex Dirty Dozen crystal

      By rehajm · Posted

      …then again it could be a recase. 
    • VWatchie
      Chinese clone demagnetizers

      By VWatchie · Posted

      As a child/young person, I remember how the police sometimes appeared in the middle of a country road and blocked off the traffic. A few minutes later, a fighter jet flew over our heads (loudly and respectfully, almost making us crap our pants), landed in front of us and was towed into the forest. It made us feel safe. I just realized that I've come a long way from demagnetizing watch movements, but isn't that the charm of associations and discussions? Anyway, I'll stick to the topic from here on! Yeah, we decided to stop developing nukes in the late 50s and spend the money on conventional weapons instead. Oops, sorry moderators, I seem to have a problem controlling myself. No more now. I promise.
    • chrisdt
      Baum & Mercier

      By chrisdt · Posted

      Hi everyone Anyone have any ideas what this caliber is? Is it a genuine B & M as I understand the market is flooded with copies? Thanks.
    • Neverenoughwatches
      Chinese clone demagnetizers

      By Neverenoughwatches · Posted

      You know it H Ours was scrapped early 60s. Nothing wrong with joining the army H , i would have love the physical and discipline side of it, but i can't follow or be lead by numpties.
    • VWatchie
      Chinese clone demagnetizers

      By VWatchie · Posted

      That's exactly why you need to exercise, or you'll meet with an untimely death! 😉 Well, good thing you weren't born in my neck of the woods then as you would have no choice. Back in the day when it was time for my service (early 80s) this small country could mobilize 800,000 soldiers in a few days, and mobilization supplies with modern weapons and munitions were everywhere and we had an air force second to none. Then beginning in the 90s it was scrapped because our politicians decided that Russia would become a Western democracy. In discussions with colleagues, friends and acquaintances where I mentioned I thought it was imprudent to scrap our capacity for self-defense, I was laughed at. I wonder if anyone of those people would laugh today.
×
×
  • Create New...