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Hinges, bearings don't turn easily

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  • #16
    I've used valve-grinding compound and with light oil to loosen up lots of things like this

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    • #17
      I figured out my problem on the control stick pivots- welding the formed arms on each end had ovalized the inner and outer bearing tubing. I put it in the vise and gave it a little squeeze and they now turn freely.

      as for the elevator cable bellcrank, I cut out the inner tube of the assembly, reamed the female portion to size and will weld the sleeve on one side, clean and polish the bearing surface, then insert and weld the final sleeve to maintain position of bellcrank on the axle. Hopefully this will eliminate the problem

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      • #18
        Originally posted by Bearhawk535 View Post
        I figured out my problem on the control stick pivots- welding the formed arms on each end had ovalized the inner and outer bearing tubing. I put it in the vise and gave it a little squeeze and they now turn freely.

        as for the elevator cable bellcrank, I cut out the inner tube of the assembly, reamed the female portion to size and will weld the sleeve on one side, clean and polish the bearing surface, then insert and weld the final sleeve to maintain position of bellcrank on the axle. Hopefully this will eliminate the problem
        If I could go back and do my elevator bell crank over I wouldn't weld it in as depicted in the plans. I would make it just like the kit bell crank is made; the pivot tube bolts in place.
        Scratch Built 4-place Bearhawk. Continental IO-360, 88" C203 McCauley prop.

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        • #19
          When I bolted the stick assembly to airframe I again had a problem with friction.
          Solved this problem- heated the female part of assembly with torch until red- yellow hot and then working it while continuing to heat. Then removed torch and kept working the bearing back and forth. It did stiffen up when cooling but after it cooled to bare hand touch and I put some CLP oil in it I worked it until it moved with no perceptible friction was detected. The control stick bearings were done bolted to the airframe and are really slick now.
          Going to do the same with rudder and elevator hinges.
          Last edited by Bearhawk535; 05-02-2017, 11:14 PM.

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