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  1. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    3DDave: This seems a bit illogical, but the truth is my PC crashed just last month, and all files were lost. Let me do again and bring up here. MintJulep: yes, agreed.
  2. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    added a thrust bearing above single tapered bearing will resist the movement of wheels at rib. And 2 bearings will handle all the forces, moments, The most resistant for prying moment is 2 wheels at rib support. Which is supportive to the top bearing to focus on rotating mechanism, and the...
  3. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    @all: structure calculation is sufficient for load test, base metal is A572-50/yield strength 355 MPa, column OD 914 x 8mm thickness. Base plate 40mm, crane boom thickness 16mm. Pin & Wheel is S45C + PWHT. LittleInch: jib crane is sufficient with load test at 7 meters point of crane boom...
  4. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    Hi MintJulep, i load tested at the closest point to center of column, start moving trolley to the farthest, and when it reached 7.5 meter, crane boom sagged down. And i start thinking about rotating mechanism had problem. Yeah, seem like the resistance to prying moment not good enough. I...
  5. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    Hi geesaman, Thank you for your great advise.
  6. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    Is this what we are referring to ?
  7. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    Hi geesaman, Does it mean i need to add a bearing above taper bearing to preload?
  8. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    Hi MintJulep, i failed during actual load test.
  9. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    Hi Littleinch, Force at C and D are 765 kg ~ 7650N.
  10. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    Hi rothers, See below analysis result.
  11. Dat Tran

    JIB CRANE LOAD TEST FAIL, NEED ADVISE

    Dear all, Please help me on this issue. i did load-testing for Jib Crane, some information as : Lifting height: 9.5 meters Crane radius : 8 meters SWL : 3 ton Single tapered roller bearing : dynamic load : 245 kN, static load : 365 kN I used single tapered roller bearing (SKF) with pin and...

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