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  1. #1
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    Default Sturdee Handscrew Clamps

    For some time now I have been impressed with the capabilities of handscrew clamps. They are easy to use, do not mark the work and unlike metal clamps are not too heavy. However they have been too expensive for me especially when you consider that you need quite a few.

    After spending a considerable time on research and working out the bugs in my prototypes I am pleased to share how I made my own, being the Sturdee Handscrew Clamps.

    The Jorgenson style of handscrew clamps uses rods that have both left and right handed threads and both jaws moving in and out from the centre. Mine uses ordinary threaded rods and nuts, with one jaw fixed in relation the one handle and the other jaw moving in and out. When the clamp is closed one of the rods extends well past the jaws, which, if left like that, could be dangerous, so I covered the rod end with extra nuts and a soft rubber tip. Total cost of the hardware was $ 2.71 provided that you buy in bulk from a bolt specialist.

    I made two sizes of clamps. The larger has a jaw length of 300 mm of 40*30mm with a clamping length of 140mm and a jaw opening of 125mm. The smaller type has a jaw length of 230 mm of 40*30mm with a clamping length of 115mm and a jaw opening of 90mm.

    This photo shows the prototype.

    Peter

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  3. #2
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    The shows the type of timber used for the first batch. The hardwood beam offcut and 4 * 2 pine was thrown out at a nearby building site and collected with permission of the builder.


    Peter.

  4. #3
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    The items needed for one clamp, being 2 blanks to make the movable jaw, the non-moveable jaw, 2 handles, 2 lengths of 5/16 threaded rod, 2 small nails, 2 T-nuts, 4 washers, 1 Nyloc nut, 6 ordinary nuts and a rubber tip.


    Peter.

  5. #4
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    This shows the lay out of materials indicating the position of nuts etc.


    Peter.

  6. #5
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    This shows the handles fixed onto the rods which are inserted 50mm into the handles with Araldite epoxy glue and secured with a small nail through the timber and the rod. Also the movable jaw has the T-nuts fixed on one part so that they are inside when they are glued together.



    Peter

  7. #6
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    This is a close up of the T-nut inside the movable jaw.


    Peter.

  8. #7
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    The centre rod is fixed to the non-moveable jaw with a Nyloc nut and washers.


    Peter.

  9. #8
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    This photo shows the position of the other nuts etc.


    Peter.

  10. #9
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    This shows the clamp completed and in the widest open position.


    Peter.

  11. #10
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    This shows the clamp in the closed position. Notice the safety rubber tip.


    Peter.

  12. #11
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    This photo shows all the clamps I have made. I made a dozen of each size. I know it is a lot but you can never have enough clamps.

    A worthwile addition to my clamps collection.



    Peter.

  13. #12
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    Thumbs up

    Hey, Peter, posting these at 2:30AM??? Perhaps you don't need more clamps - you need a life!!!!!

    Nice work. Bring a few along to the next Triton Woodworkers Club meeting.

  14. #13
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    Don,

    I could say " genius " does not sleep but I am no genius.
    The truth is last night before I went to bed I had finished preparing everything for posting early this morning. When I woke up during the night, rather than going down to the workshop and firing up my machines and waking everybody up so they could keep me company, I decided to post the details instead.


    Yes, I will bring some along on Sunday.

    Peter.

  15. #14
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    Jan 2001
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    Thumbs up Well Done

    Sturdee,

    Yet another excellent design. These work very similar to Toolmakers Clamps. They too, only have RH threaded shafts.

    Glen

  16. #15
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    Apr 2003
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    Sturdee,

    They look like a very handy addition to a workshop.


    - Wood Borer

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