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Is this a tension/compression tap chuck?

leeko

Stainless
Joined
Jun 30, 2012
Location
Chicago, USA
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
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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.
 
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.
 
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!

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

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

Scruffy, no idea what that means sorry

Lee

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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... :D

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.
 
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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