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      CommentAuthorNick
    • CommentTimeJul 2nd 2009 edited
     
    Make your own "retractable casters" by mounting them on a thick board (such as a length of 2x4), then attaching this board to the side of the tool stand with strap hinges or a piano hinge. When the board is folded up, the casters should be off the ground and the tool stand should rest on its feet. Lever the board down with a length of 3/4" pipe (I use the unemployed end of a pipe clamp) and the tool will rise up on the catsers. Lock the casters down with a cam mounted on the side of the tool stand, above the caster board.

    With all good wishes,
    Nick
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      Retractable_Casters_Deployed.jpg
      Retractable_Casters_Plans.jpg
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      CommentAuthorjoedw00
    • CommentTimeJul 4th 2009
     
    That looks simple enough, but how much weight will the hinge hold?
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      CommentAuthorNick
    • CommentTimeJul 5th 2009 edited
     
    Continuous hinges have a surprising load capacity. A standard, run-of-the-mill 2" steel hinge (1" folded) with a 1/8" pin will support 25 to 50 pounds per linear inch depending on the gauge of the leaves and the quality of the swage. (Open swages support less, welded swages hold more.) Checking around on the 'net, I found 3" hinges with a rating of 80 pounds per inch and a 5" hinge used in aviation and automotive manufacturing that the maker claimed would hold 125 pounds per inch.

    With all good wishes,
    Nick
    • CommentAuthorJPG40504
    • CommentTimeJul 7th 2009
     
    A suggested change is to put a 6" radius on the end of the cam rather than a 1 1/2" radius or to include a method of preventing the cam from rotating off the caster piece. A second hole and a pin would do.
    • CommentAuthordusty
    • CommentTimeJul 8th 2009
     
    What would the 6" radius provide that is not done by the smaller radius.?
    • CommentAuthorJPG40504
    • CommentTimeJul 10th 2009
     
    Less tendency to cam back to the 'unlocked' position. As long as the force of the hinged piece is perpendicular to the cam surface it does NOT make any difference. If the radius is 1.5" the angle of the force deviates from perpendicular more than if the radius is 6". As long as the cam piece is plumb, there is no difference, but if the cam piece is slightly out of plumb, the force is not perpendicular to the cam. The resultant force trying to move(rotate) the cam piece will be greater the smaller the cam radius. A radius greater than 6"(the distance from the pivot) will not work since it would bind against the hinged piece when it is 'level'.

    It IS possible the friction forces overcome the tendency to rotate the cam piece. The changing contact 'area' of the cam to the hinged piece as it 'hinges' would also tend to diminish the 'difference' due to increased frictional forces. Even so it WOULD be 'better' with a larger radius on the cam. 1.5" radius IS easier to layout and may be 'prettier'!

    Upon further consideration, I believe a flat area on the end of the 'cam' piece would be a better 'improvement'. This would eliminate any tendency for the cam piece to rotate. A radius starting 1/2" from the edge(leaving a 1/2" FLAT) would probably be 'enough! With the 'flat' the radius size doesn't matter. This WOULD require rotating the caster piece further(down) to clear the inboard edge of the 'flat'.
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      CommentAuthorNick
    • CommentTimeJul 10th 2009
     
    I tend to agree that the arguments for a larger radius are logical, well thought-out, and make for a better-engineered cam. However, it's also my experience that the small-radius cam is adequately engineered. The friction of end grain on long grain holds it in place; I've never had one slip. Consider that these cams are only employed for a few moments at a time. I put the casters down, move the tool, and flip the casters up. Perhaps if I were working in a different material or the cam had to hold for a long trip then my experience would be different. As it stands, my advice to the reader is "Don't sweat the radius. Just knock off the corner so the cam swings in place easily."

    Wih all good wishes,
    Nick
    • CommentAuthorJPG40504
    • CommentTimeJul 11th 2009
     
    I LIKE THE RETRACTABLE FEET BETTER ANYWAY!
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