Is this a tension/compression tap chuck?
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  1. #1
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    Default Is this a tension/compression tap chuck?

    Hi everyone,

    I have a piece of tooling that I think is a tension compression tap holder, but I haven't been able to find it in a lyndex catalog or via Google. Can anyone please confirm?

    The holder has the following stamped on it:

    Lyndex FH2-ST1.1/4/ER25 -7.75

    I believe that makes it an ER25 holder on a 1-1/4" shank. The intermediate shank of the ER25 has a little twist/play in the main holder, which is why I think it might be a tension/compression holder. But before I buy a set of ER25 collets and break some taps I'd like to verify. I'll be using it in a haas minimill without rigid tapping (yet).

    Thanks in advance

    Lee

    Sent from my SM-N960U using Tapatalk

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    I had something similar I used on a capstan lathe, it had a friction ring inside, and the ring with the two holes was tightened or loosened to increase/decrease the friction.

    What happens when you undo that ring.

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    If it is what you ask, you should be able to pull it out some, and with a little more effort push it in. If you cant get it to move, I'd tend to think it was not a tension compression device.

    If it was some kind of torque limiter, I think you'd have a scale or markings like you see on torque limiting quick change tap holders.

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    Thanks for the comments

    I undid the 2 small set screws and unscrewed the large ring some. I can now pull out the business end by about 1/8" or so. It wants to go straight back to the fully retracted position though, and I can't push it in further than that. There's maybe 10 degrees of total rotational play at the business end too.

    Is 1/8" enough for a tapping head?

    Thanks again!

    Sent from my SM-N960U using Tapatalk

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    Quote Originally Posted by leeko View Post
    ...Is 1/8" enough for a tapping head?...
    No. Unless you're crawling RPM wise. Plus a little compression capability never hurts either.

    I couldn't find that tool in any of my old Lyndex/Nikken catalogs. Also the least tension amount I could find was just over 1/4".

    It does now strike me as a potential torque control thingy though.

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    Could it be a reamer holder? Something with lateral play, but not tension/compression?

    And wot the hock is with the gingerbread house 'n stuff in the background? We're barely into Spring!

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    Quote Originally Posted by Milland View Post
    And wot the hock is with the gingerbread house 'n stuff in the background? We're barely into Spring!
    Ask my wife n kids

    Sent from my SM-N960U using Tapatalk

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    I think I'll take it apart and see what the heck is going on inside... Can't hurt, other than springs going everywhere...

    Sent from my SM-N960U using Tapatalk

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    Is there any radial/lateral movement? Sort of looks like a floating reamer holder.

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    Quote Originally Posted by Mud View Post
    Is there any radial/lateral movement? Sort of looks like a floating reamer holder.
    Yeah, I asked that in #6.

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    WTF! The first tool thingy you ever bought and you had it bronzed and show it off on the kitchen island? Get a walnut mounting block fer chrissake.

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    No, there's no lateral movement - just rotational and axial

    Scruffy, no idea what that means sorry

    Lee

    Sent from my SM-N960U using Tapatalk

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    Get a torque wrench and see if it slips

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    I think Scruffy was making a crack about your photo's white balance looking very soft. And maybe the fact that your tooling is on the kitchen counter? Not sure...

    Generally a floating reamer holder won't move in and out I think. Only perpendicular to the rotational axis, and maybe tilt a little on some of them. I just saw a set of instructions the other day for a tension/compression tap driver and it mentioned using about 95% of the thread pitch for feed, so they are expecting the tap to get pulled out, not pushed back in.

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    my tapholders only pull out.

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    I once had something just like that many moons ago that was an ER25 floating reamer holder according to the guy I traded with. Bought it for the collets, took it apart to see what it was and then traded it for a 2" boring head. I can't really remember much about the inside, other than some springs, balls, grooves and whatsits. Pretty neat though.


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