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does this have a prayer of working

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  • does this have a prayer of working

    I am building a caster cart to set my Cincinnati mill on. Its pretty heavy #2500.

    I want to be able to wind the casters up ... so that the mill will set totally on
    the ground .. then wind the casters down .. when I want to move it.

    I am using some pretty thick steel channel. And the casters are beasts. I'm not
    real sure I am going about it right .. as far as the up down part goes ... here is
    a mock layout. I will be using 2 of these tied to together front and rear.

    Maybe ? ... no ?

    .

    Last edited by Mike Amick; 10-01-2012, 11:23 PM.
    John Titor, when are you.

  • #2
    At ~625 pounds per caster, it looks sturdy enough. Does that lift bolt go through the floor plate of the caster? That looks to be the weak point. The metal of the caster plate will be supporting all the weight on the washer between the bolt head and the plate.

    Pops

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    • #3
      I think you're on the right track. Only thing I would do is make a plate that bolts to the caster and weld the stud to it. This eliminates any heat on the caster itself and also makes it easy to replace one if you ever need to. I might be inclined to go to a bit larger bolt--I'm guessing that the ones in the pic are about 3/4"...
      Keith
      __________________________
      Just one project too many--that's what finally got him...

      Comment


      • #4
        cool thanks ...

        I should have put a pop can in the pic for scale ... the bolts are 1 1/8th
        I agree .. about the plate .. the bolt will be welded to a plate that will be bolted to the top
        of the caster ... and I even thru the bolt in the lathe .. and flattened the top for good
        surface contact for the weld.
        John Titor, when are you.

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        • #5
          I'd plate the sides of the double uprights as the form a rectangle rather than a triangle and may be prone to racking which will ultimately lead to wrecking. How will the casters swing up and down?

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          • #6
            I'm probably mis-reading this, but it looks as if you will be turning the castor as you turn the bolt. If so, as you've shown it, it seems the castor will hit the upright. And if you're using the castors to do the jacking, it's going to be hard to turn the bolt as the wheel contact patch will be describing a circle on the floor.

            Just ignore this if I've got it all wrong.

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            • #7
              Maybe you could hinge the caster to the upright so that when you crank down on the bolt, the base is raised off the ground when the caster top is level.
              Location: Saskatoon, Saskatchewan, Canada

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              • #8
                914 .. this is realllllly heavy duty stuff ... and I don't know what racking is .. is that like twisting
                or something like that ?>

                Cameron .. I have taken care that the bolt (centerline) will be far enough from the upright
                so the caster doesn't hit it. But you are probably right about it being hard to turn the bolt.
                I don't think the whole caster will turn .. I believe just the pivot plate on top will (I think) but
                that is probably my biggest worry.

                I haven't done any drilling or welding yet .. in case a really good idea comes up to lower and
                lift the caster.
                John Titor, when are you.

                Comment


                • #9
                  I suggest rather than retracting the casters how about a bolt that you can screw down to lift the entire machine so that the casters have no weight on them? These bolts would also serve for levelling the machine.

                  John

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                  • #10
                    Going with Artful on this...have seen lots of designs where the bolt/screw raises or lowers machine to load or unload the caster, don't know that I can recall seeing a design where in effect the caster itself is involved in the raise/lower.
                    There have been a few similar bases here before, not sure what to suggest as a search item...

                    Comment


                    • #11
                      I think Artful Bodger has a good idea. Get some of that 1"1/8 in longer length and put it through the 2 uprights as jacks and levelers when it is in position. Racking is the sideways movement of ths cradle so the gussets suggested should be welded on the sides of the uprights this will help stop it from racking.

                      Mr fixit for the family
                      Chris

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                      • #12
                        One thing I should have mentioned. One reason I am doing this is to lower the mill as much
                        as I can. Right now I have it on a reinforced pallet and the table is like upper chest high. I
                        really wanted to have the mill sitting flat on this channel to lower it. Because of this .. I may add
                        adj feet for leveling ... but .. I don't want to use them for caster positioning.

                        I may have think about that idea of hinging a plate with caster on it ... then .. swiveling the plate
                        up and down.
                        John Titor, when are you.

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                        • #13
                          I strongly advise against hinging the plate. I've use identical casters (mine are 8" wheels) and although they will hold a lot of weight, the weak link is the center rivit on the swivel bearing. There is already a pulling load on that rivit due to the angle of the castering arm, and if you 'swing' the mounting plate that angle becomes more acute with a corresponding increase in tension. The rivet head or the plate will likely deform and fail, at the least releasing the bearing balls, at worst breaking completely. I know the rivit looks massive, but the material is soft.

                          With regard to height, 'landing gear' as suggested above is still the best solution. If you mount the casters high (outrigger style) so that the machine support is only a half-inch or so above the floor, you're only gaining a half-inch more than your proposed design and a much stronger and simpler mechanism.
                          Last edited by chipmaker4130; 10-02-2012, 03:34 AM.

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                          • #14
                            Ok .. you just talked me out of hinging or anything else that adds more angle to the casters
                            already built in angle. I see exactly what you mean. If I had a nice shop floor I wouldn't
                            mind having my cart glide a 1/2" off of the floor ... but .. I have a couple of diff slabs that have
                            settled and have "lips" .. that require much more clearance than that to get across the shop.

                            I just have to think outside the box a little here. You guys really are helping the think tank
                            process here though. Its like having a bunch of old heads sitting around a table saying ...
                            " nope .. can't do that .. here's why .. think of another way .. " .. lol
                            John Titor, when are you.

                            Comment


                            • #15
                              I'm still trying to figure out why a 2500 lb machine needs to be easy to move.

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