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Paul Lousick30/01/2020 23:48:04
2276 forum posts
801 photos

Colin,

If you are using one of the column mounted hoists as shown, there should not be a problem with lifting 100kg at 1.5m.

The bending moment of listed load at the extended position (neglecting electric hoist) = 1.1m x 200kg = 220 kgm. Your bending moment at 1500mm = 1.5m x 100kg = 150kgm. Therefore OK because less than before.

Paul

Colin Heseltine31/01/2020 10:21:25
744 forum posts
375 photos

Paul,

Many thanks for the maths response. Good to know the (simple) maths/physics says it is ok. I could not bring the term 'bending moment' to mind.

Colin

Howard Lewis31/01/2020 11:38:54
7227 forum posts
21 photos

Another thing to bear in mind if extending the lifting arm.

Extending it may keep the bending moment within your limits for a vertical lift.

But being longer, it will be relatively weaker in the horizontal plane. This needs to borne in mind, as you do not want the arm to bend horizontally as you swing the load from one place onto the machine, or vice versa.

Extending the arm by 50% will reduce the horizontal resistance to bending by 70% (BD^3 /12 )

If there is storage space, I would advocate adding additional reinforcements to each side of the extended arm, to prevent any unwanted risks.

Howard

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