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  • Cat 40 taper

    Anybody know off hand if a cat-40 mill taper can be converted for use in a 40-NMT spindle?
    I just need one more tool,just one!

  • #2
    I've used them in our mill, it has an adjustable drawbar that allowed it to extend longer to make up for the shortened length, as far as I know the taper is the same. No reason why you couldn't make an adapter stud.

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    • #3
      The Cat-40 uses a 1/2-13 Pull stud and the NST-40 uses 5/8-11 drawbar. It is also important to note that the Cat-40 requires a tight fit of the keys to the key slots - you may have to replace them or modify yours. With the smaller pull stud it is easier to turn the toolholder in the socket - hence the requirement for a tight fit of the keys.

      So they will work with a new drawbar and possibly new torque keys on your spindle. It would be a good idea to consider a socket cleaning tool like the Spindle Mate (expensive, but it can recondition the surface of your socket if rough and keep it clean).



      [This message has been edited by Thrud (edited 03-06-2003).]

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      • #4
        sorry, but cat 40 uses 5/8-11, looked it up in that new book you recommended. cat 30 uses 1/2-13 thread. There's another taper that uses a metric pull stud that's close to cat 40 but I'm not sure what it's called.

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        • #5
          I found one on Ebay and took the chance it came in with a 5/8-11 thread works okay I made a new draw bar an 1-1/4"longer out of some B-7 round bar and then made a hardened steel spacer the same length so I can use my other endmill holders as the cat-40 doesn't have the same projection on the end.Thanks for the help.
          I just need one more tool,just one!

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          • #6
            T Wise:
            Thanks for the correction, I was thinking of the flange bolts for some stupid reason. Looked it up and you are correct.

            A drain is a terrible thing to bamage.

            Wierdscience
            There are lots of good deals on eBay for them - including Wohlhaupter boring heads and Lyndex collet chucks(on occasion).

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            • #7
              Hmmm...boring heads..yes...must have boring head!
              I just need one more tool,just one!

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