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Thread: controlling torque

  1. #1
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    Unhappy controlling torque

    Folks,
    I was out in the shop working on my new workbench tonight, and I spaced drilling a pilot hole for one of the lag bolts ... I thought I could out muscle it, but the torque finally out did me. I wound up loosening the opposite end's bolt, spreading apart the leg. which is designed to trap the pipe clamp section as shown here.

    Would a pair of deck screws hold on either end well enough to counter the torque of driving the bolt home? Or should I use a stouter screw? The deck screws would stay in there, but I think i'd remove anything heftier than that as I don't have many and would need to repeat that procedure on the 2nd leg.



    I gave up when the wrench I was using slipped off of the bolt and flew across the room. at that point I'd had more than enough, and had some computer work to wrap up.
    Last edited by Ned Bulken; 04-16-2009 at 03:56 AM.
    -Ned

  2. #2
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    Ned, did you predrill for the Lag Bolts? If not, drill a hole with a "Slightly" smaller diameter bit than the diameter of the lag bolts solid shaft, (not including the threads), and that should relieve the necessity for Extra torque, AND prevent the lag bolt from splitting the wood. Deck screws should hold it in position OK then.

  3. #3
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    Ned, I think the deck screw would be very adequate for the job there. But, I don't know how much you're expecting out of the set up. I have always been accused of "over building".
    Aloha,

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  4. #4
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    Quote Originally Posted by Norman Hitt View Post
    Ned, did you predrill for the Lag Bolts? If not, drill a hole with a "Slightly" smaller diameter bit than the diameter of the lag bolts solid shaft, (not including the threads), and that should relieve the necessity for Extra torque, AND prevent the lag bolt from splitting the wood. Deck screws should hold it in position OK then.
    Norman,
    yep, on 5 out of the 6 holes, I predrilled... 6th one I forgot and paid the price.


    Quote Originally Posted by Royall Clark View Post
    Ned, I think the deck screw would be very adequate for the job there. But, I don't know how much you're expecting out of the set up. I have always been accused of "over building".
    just want it to keep the board from spinning when I tighten the bolt. The Lag bolt is doing the holding together job.. the deck screws would just counter the torque as I tightened the lag bolt.
    -Ned

  5. #5
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    Also consider putting some beeswax or soap on the lag threads to lube it. This will not affect the holding power.

    Cheers
    Dan Gonzales
    Whittier, CA, USA
    Dona nobis pacem

  6. #6
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    Quote Originally Posted by Ned Bulken View Post
    Norman,
    yep, on 5 out of the 6 holes, I predrilled... 6th one I forgot and paid the price...
    Why can't you drill the hole now? Any time you have to fight a piece, it's a sign that you need to regroup. Even if it requires a bit of disassembly, it'd save you the potential for sore muscles, flying wrenches and split wood. (And if the wood splits, you're gonna have to re-do things anyway.) I'd vote to take a step back and get right instead of trying to muscle your way through (and subsequently messing something up and making for more work for yourself in the long run).

    Oh, and to temporarily keep the board from spinning (the torque you're fighting), you can just put a bar clamp on it down by the floor and just step on the clamp.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
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  7. #7
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    Nothing to add to what has been suggested.
    But, will say quitting for the day at that point was a good move.
    When wrenches start flying, it's time to regroup. Lot of problems get solved for me by just walking away and coming back later.

  8. #8
    Bob Wiggins is offline Former Member (by the member's request)
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    Take a step back several years when there was such a thing as pilot hole and anchor hole. The pilot hole is bored such a size the lag bolt or screw just slips through the hole with no resistance. The anchor hole is bored the size of the screw thread minor diameter or a few thousandts larger. This allows the head to function (pulling 2 members together) as it should with very little frustration.

    And of course the anchor hole needs to be bored through both members first.
    Last edited by Bob Wiggins; 04-16-2009 at 03:50 PM.

  9. #9
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    OK, dumb question. Why didn't you clamp it into the workmate it's standing next to?
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  10. #10
    Quote Originally Posted by Rennie Heuer View Post
    OK, dumb question. Why didn't you clamp it into the workmate it's standing next to?
    Astute thought!! Also, it is not a sign of weakness to back out of the hole and drill the pilot correctly. (Lag screws are not known for their ability to withstand such torque w/o snapping (then where would you be?)

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