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Thread: Double "T" nut

  1. #1
    Frank S's Avatar
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    Double "T" nut

    I was forever needing to clamp a part right where the coolant return tray was on my old radial drill I used to have so I made some of these "T" nuts then instead of cutting all of them into individual nuts I kept this one as a double
    Double "T" nut-dscf6939c.jpg
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

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    Captainleeward (06-11-2016), Jon (06-06-2016), lazarus (06-10-2016), Paul Jones (06-06-2016), Toolmaker51 (06-07-2016)

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    More tricks on subject of clamping

    Yep, these extensions work. I do this on rotary tables, tilt tables and so on.
    A good way to add stops outside the normal surface envelope too. Use caution though people, you'll generate a lot of leverage outside the t-slot; they can break. If you make these, fit them closely, so when under tension they contact a decent amount of the underside of t-slot to counteract tendency to tilt. A set screw in the inboard tapped hole helps too.
    Spherical washers equalize contact between step block and part, at the nut. Nut needs to be paralell to upper surface of clamp, otherwise stud/ bolt are bending. https://www.carrlane.com/catalog/index.cfm/27025071F0B221118070C1C512D020609090C0015482013180B041D1E173C3B2853524A5D Maintain a minimum 2 or 3:1 clamp ratio.
    I'd also recommend "rotary" t-nuts when you need additional clamping part way through a set up. https://www.carrlane.com/catalog/index.cfm/27225071F0B221118070C1C512D020609090C0015482013180B041D1E173C3B2853524A5C56
    They drop in the t-slot instead of needing access from the open end of table.

    Website supplied is not a recommendation of brand, just a very complete online catalog.
    I am 100% cautious of where my tools are made though, the giant distributors don't always declare where items are sourced. Cheap clamp hardware is exasperating.
    PM me and I'll provide reliable contacts that make and carry good quality components.
    And to Jon, maybe contacting those to offer ad space would be worthwhile...$$.

    I have no financial arrangements with any, probably why I have favorites.
    Last edited by Toolmaker51; 06-07-2016 at 07:09 AM. Reason: phrasing
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

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    Paul Jones (06-10-2016)

  5. #3
    Frank S's Avatar
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    Tool maker is correct caution is required when clamping outside the realm of the devices parameters.
    in my case my drill press had its "T" slots milled all the way tp the rim of the table the double "T" nuts were long enough to reach both the rim and the main part of the table even with this I took care not to over tighten my clamps. MY philosophy was more clamps at lower torque on each was by far better than trying to squeeze b y with fewer clamps by over stressing them.
    I often used a 36" diameter plate on my 12" rotary table to hold rubber molds I was making i used small machinist jacks with bearings to support the large plate and added clamps with bearings where possible to secure it as well and still allowing rotation
    Very tricky to make oversize projects on undersized machines but doable with care and planning
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  6. The Following 2 Users Say Thank You to Frank S For This Useful Post:

    Paul Jones (06-10-2016), Toolmaker51 (06-07-2016)

  7. #4
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    Thanks Frank S! We've added your Double T Nut to our Workholding category,
    as well as to your builder page: Frank S's Homemade Tools. Your receipt:




  8. #5
    Paul Jones's Avatar
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    Frank S and Toolmaker51,
    Good advice on using the double t-nuts and thanks for another resource for tooling clamps and hold-downs.
    Regards, Paul


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