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T nut location

Discussion in 'A BEGINNER'S FORUM (Learn How To Machine Here!)' started by Geerbangr, Aug 12, 2017.

  1. Geerbangr

    Geerbangr United States Iron Registered Member

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    Hey fellas, I got my enco mill/drill setup yesterday. I'm like a kid in a sea of candy with this machine.

    Question I have is about the t nuts and my Kurt vise. Should the t nuts protrude up in the register in the Kurt vise but not to far so they won't tighten? Here's a pic to help understand.

    I have to true the vise up on the mill but wanted to ask about these t nuts so I'm doing the setup right the first time.

    [​IMG]
     
  2. woochucker

    woochucker United States Active Member Active Member

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    No, the tnut should be short of the table top.
    On my vise, I have blocks that fit into the vise, and register the slots.
    So my T nuts are shorter so they don't touch.
    edit: welcome aboard, enjoy your new toy ...er machine.
     
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  3. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    T-nuts should be cut shorter than what you have in the photo anyway. First, if the shoulders are low enough, the t-nut will clamp to the vise or other work before it clamps to the t-slot. The same can happen because of chips on top of the t-nut. If you cut about 1/8" off of that nut there will be room for the vise key to fit above the t-nut, if that is an issue. Usually the vise bolts are far enough to the sides of the vise that the keys do not interfere with the hold down t-nuts. Keep it in mind when dimensioning for making the keys. I prefer to make the keys fit quite snug to the vise slots and fairly snug to the table slots, which makes tramming the vise dead easy and quick. Also round and smooth all the corners and edges of the keys that face the table so they do not scratch the table when installing the vise.
     
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  4. markba633csi

    markba633csi United States Active Member Active Member

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    Our OP may not realize what those slots are for and that he needs to make some keys, hopefully Bob's post makes that clear
    Mark
     
  5. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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  6. T Bredehoft

    T Bredehoft Active User H-M Supporter-Premium

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    Re: Bob's post above, A picture is worth a large number of words.
     
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  7. Tony Wells

    Tony Wells United States Former Vice President Staff Member Administrator

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    It doesn't appear to me that the nuts the OP has are proud of the table surface, so no need to cut them down. I for one don't use the keys on my vises. As mentioned, they can scratch the table, but also their absence makes it easy to swing the vise to virtually any angle I want to mill the end of a workpiece. I have no problems sweeping in a vise true without the keys. Takes about a minute. Being careful with the weight of the vise to keep it off the table with keys isn't worth it to me. Plus you have to have a safer place to store the vise to prevent damage to the keys unless you remove them each time.
     
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  8. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

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    Thanks for the post.
    Never heard of them before.
    Learned another thing today.
     
  9. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    I'm also not a fan of using keys on my vise for the same reason Tony mentioned. I don't use them on my rotab either. However I do use keys on my super spacer & tailstock but I don't rely on them to index sqaure. I machined my keys to be slightly undersize so I still indicate those accessories in.
     
  10. kd4gij

    kd4gij United States Active User Active Member

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    Another fan of no keys here.
     
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  11. Geerbangr

    Geerbangr United States Iron Registered Member

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    Hey guys, thanks for all the replies!! I've went with not using keys in the vise. I zero'd out the vise on the mill and it is doing a terrific job. I'm like a kid at Christmas time!!
     
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  12. Geerbangr

    Geerbangr United States Iron Registered Member

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    [​IMG]
     
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  13. markba633csi

    markba633csi United States Active Member Active Member

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    One thing I do like about keys (besides the automatic location when mounting) is that they reduce the torque requirement of the main bolts and the
    stress on the t-slots. But making and fitting keys is a pita
    Mark
     
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  14. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    I like the keys because they help stop errors caused by the vise slipping, and also take away the requirement of tramming in the vise for most work. With snug fitting keys, simply putting the vise on the table and bolting it down gets my vise within .001" over 6", bumping one corner with my palm and then tightening it down gets it under .0005" over 6". The vise can be angled by simply removing the keys temporarily, two screws. The easiness of moving the vise on and off the table prompts me to take it off and bolt stuff to the table, or simply slide it to the end of the table. still in tram, and also to move the vise to different lateral table locations regularly, helping to equalize the wear along the lead screw and ways. That long table is meant to be used, and not just for loose tools!
     
  15. markba633csi

    markba633csi United States Active Member Active Member

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    Right on Bob. I'm a member of the swiveling vise with keys club
    Mark
    0813171428-00.jpg
     
    Last edited: Aug 13, 2017

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