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Thread: TTS

  1. #1

    Default TTS

    TTS in machining usually refers to Tormach Tooling System. I believe they have a trademark on TTS with that meaning.


    Basically it consists of a 3/4 inch R8 collet that has been face ground so that when clamped on a 3/4 shank tool the face of the collet is slightly above (retracted into) the face of the spindle. The "proper" TTS tools and tool holders are simple a 3/4 shank tool/holder with a collar that registers against the spindle nose. Often this system is paired with a spring loaded drawbar that is released by compressing the springs.


    I have a Tormach mill with TTS system with power drawbar as described above. It works "okay," but if you get some chatter or excessive loads with larger tools they can pull out of the spindle. I've seen it happen. The limitation is the strength of the spring stack, and the pressure rating of the pneumatic cylinder. I've added springs, tightened the draw bar, and increased the air to release it. It works marginally well. I don't have issues unless I forget and do something stupid.


    All of that is just back ground facts. Yes other systems are better. Whether you think its good or bad I do not care. My question is would going to a 1" collet have more or less hold on a suitably sized tool/holder given that no other factors would have changed?


    I can grind the face on a good quality collet, and I can make my own tools and tool holders. I have made a few of my own tool holders for special application, and that I can do so relatively easily is one of the big positives about TTS for me.

    Bob La Londe
    http://www.YumaBassMan.com


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    Default Re: TTS

    Bob,

    If you held everything else the same, the surface area of the shaft of a std TTS tool holder is about 3.83 sq inches, while a 1" shaft would give about 5.5 sq inches, around a 30% increase. So at first glance, it would seem the 1" holder would resist pull out better. Whether it would be enough of an increase in holding power to make it worth starting a new line of tool holders, I can't really guess. I'm sure some of our smart guys could give a better reply.

    Terry



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    Member kstrauss's Avatar
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    Default Re: TTS

    That was my first thought also. However, assuming that everything else is kept the same wouldn't that mean that each square inch of the gripped area would be squeezed corresponding less hard since the total gripping force would remain the same? Consider also that the coefficient of friction is dimensionless and that frictional force is the coefficient of friction times the normal force.



  4. #4

    Default Re: TTS

    I have been told 1" R8 sticks out of the spindle to grip. That would make the hole idea a non starter.

    Bob La Londe
    http://www.YumaBassMan.com


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    Member kstrauss's Avatar
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    Default Re: TTS

    Couldn't you solve any collet stickout issue by making the recess deeper and/or making the reference ring larger?



  6. #6

    Default Re: TTS

    What can I say? I was looking for an easy answer. The easy answer of course is to get rid of the air cylinder and find something that actually cranks down the draw bar instead of just pushing it up with a hand full of springs. Before anybody mentions it... yes I am aware some others do that, but I am trying to keep this about Tormach here in the Tormach group.

    Bob La Londe
    http://www.YumaBassMan.com


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    Member kstrauss's Avatar
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    Default Re: TTS

    Agreed that we should discuss only Tormach relevant solutions but also consider possible upgrades.
    Look at http://www.sdmfabricating.com/LOD.html and I suspect that it could be modified to apply even more force.

    I haven't measured things but you could possibly somewhat increase the diameter of the Tormach pneumatic cylinder and/or change to three instead of only two stacked cylinders. Stronger Belleville washers are readily available. Is the maximum working pressure for the Tormach cylinder only 100psi?



  8. #8

    Default

    Quote Originally Posted by kstrauss View Post
    Agreed that we should discuss only Tormach relevant solutions but also consider possible upgrades.
    Look at http://www.sdmfabricating.com/LOD.html and I suspect that it could be modified to apply even more force.

    I haven't measured things but you could possibly somewhat increase the diameter of the Tormach pneumatic cylinder and/or change to three instead of only two stacked cylinders. Stronger Belleville washers are readily available. Is the maximum working pressure for the Tormach cylinder only 100psi?
    I don't recall what the specified maximum pressure is, but I do remember that I already have it set higher than that and I already have more washers on the stack. I had to turn it up when I added the additional bellville's.



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    Default Re: TTS

    At this point, don't you want a 30-taper spindle upgrade?
    You're kinda pushing the system harder than it's designed to go.



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    Default Re: TTS

    Modifying the TTS shank to solid really helps - I tested this - see these videos:

    Cliff







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