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[Newbie] 3/4" Weldon to Cat 40

Discussion in 'MACHINE ACCESSORIES (Tables, Vises, Indexers)' started by lis2323, Apr 19, 2017.

  1. lis2323

    lis2323 Canada Swarf Registered Member

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    Hello everyone.

    I'm new to the site and a retired farmer with (really) basic machine shop training from high school over 50 years ago. I don't pretend to know anything.....

    Anyhow. I recently acquired a "First" ( Bridgeport clone) with a Cat 40 spindle. What's my best route for adapting a Weldon shank for using annular cutters? I seem to be able to find only MT and R8.

    [​IMG]

    Thanks in advance for any help.

    Terry
     
    Last edited: Apr 19, 2017
  2. Tony Wells

    Tony Wells United States Vice President Staff Member Administrator

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    You simply use a 3/4" end mill holder that is CAT 40 taper. No more complicated than that. That's if I understand correctly. I am reading that you have an annular cutter shank of 3/4" diameter. Weldon is first just a brand name, but it's come to mean any tool shank with a flat or sometimes 2 on it. Normally you will see these driven by holders with set screws, but unless you need the torque transfer, there is no reason you can't use them in a collet. For that matter, if you have a CAT 40 collet set that will hold it, go right ahead.
     
  3. lis2323

    lis2323 Canada Swarf Registered Member

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    Thanks, Tony. That's what I'll do. I was overthinking the situation.
     
  4. Superburban

    Superburban United States Active Member Active Member

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    There is a tool holder made for Weldon shank tools. The Weldon shank refers to the flats on the tool, and they did (possibly still do) make a special tool holder that was designed just for the tooling. It has two set screws, one to tighten on the flat spot, and the other tightens on the body of the tool. weldon.jpg
    Thats why some tool holders are marked to tighten one set screw first, it is the one that was designed to tighten on the flat spot.



    Tapers_Weldon_1.jpg

    http://www.tools-n-gizmos.com/specs/Tapers.html

    I have seen some tooling marked as Weldon shank, that has four flat spots (A square section on the shank).I believe they are designed to transmit even more force to the tooling, but have not seen any reference stating such.

    I don't see why either could not be held in a same diameter tool holder. Just be sure to tighten on the flat spot first.
     

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