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Recent content by JRCEng

  1. JRCEng

    Scissor Lift on Grating

    dhengr I see where your going, but is there a way to figure out how far you can stretch the concentrated load, if I can extend the load to 10 bars, then the deflection becomes 0.323728in(Updated I in denominator), the maximum allowable load becomes 672.78lbs(M = F*Sw, updated Sw) . Which again...
  2. JRCEng

    Scissor Lift on Grating

    XR250 when you say "3/4" deflection at the base = 9 fn inches sway at the top" does it mean that if it dips(one wheel) 3/4" the structure when extended will swing out 9"?
  3. JRCEng

    Scissor Lift on Grating

    XR250 I agree, I should have done it worst case scenario, I was trying to make it work bare minimum, was going to write a doc for operations that would place restrictions when the lift was in operation and moving (Example: No occupants or items inside while moving), but anyway I work the numbers...
  4. JRCEng

    Scissor Lift on Grating

    The grating sheets specify load per foot length, so for 72" it supports a max concentrated load of 711lbs, and for 78" a max concentrated load of 656lbs. If I use an online interpolator, I get 676lbs for 76". The way I read the chart, its as if they applied a ruler size force at the midpoint...
  5. JRCEng

    Scissor Lift on Grating

    So it looks like for a = 4.5" and b = 4", where the a spans parallel to crossbar I get the following: Mb = 3342.63 lb in (which I think is Mw in prior but its more conservative) Du = 0.767976in --------- [687( (4/2)^2 + 76^3 - (4^2)(76/2) ) / 48EI , I is the same as above 0.199705 in4] Its...
  6. JRCEng

    Scissor Lift on Grating

    Hello All, New Member here, and I have seen a few of the other post about scissor lift on gratings but am still unclear on how to go about determining the load capacity of grating given a contact patch of about 4.5" (tire width) by 4" (tire length). The scissor lift is a Genie 1930 model, and...
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