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Bob's Metelcasting needs a new CNC router and I decided that this one would be built from new material. Then I saw the price of the linear bearings at $125 and decided to build them myself. The dimensions are exactly the same as the manufactured bearings so that they can be swapped out at a later date.
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The design, scaled up 1.8% to allow for shrinkage.
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Machining 2 bearing cases.
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Installing the bronze bushings.
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The top is glued on and machined.
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The finished foam bearing.
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Sprue, runner and wire support with 2 thin coats of joint compound. The hardware grade rod is left in place so that the bushings don't move.
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The pour. Video 971kb lb_pour.wmv
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The crud on this casting is the result of running my Vacuum Casting Box while pouring. It looks like a ruined casting but it easily chips off.
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