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Two figures stand at the start of every sizing: how much must the device carry, and which moment does that create at column and gripper? Both follow from four inputs.
Limits of the calculator. The calculation is static and excludes the dead weight of the jib. Dynamic factors, the stability of the column and the loading of floor or ceiling are part of the manufacturer’s design.
A device with a capacity of 100 kilograms does not lift a workpiece of 100 kilograms if the gripper itself weighs 25. The required capacity is the sum of the heaviest workpiece and the lifting attachment with all fittings. This is the most common mistake in enquiries – and it only shows at commissioning.
The weight force of the load acts at the end of the jib. With the reach as lever arm, the load moment at the column is M = (m load + m gripper) · g · L. It determines how jib, bearing, column and anchoring must be dimensioned – and why half a metre more reach can mean a different device.
If the attachment does not grip at the centre of gravity, the load wants to rotate until its centre of gravity lies vertically below the suspension point. At the gripper connection a moment arises from workpiece weight and centre-of-gravity offset. A device with rope or chain cannot take it up; a rigid manipulator arm can – and that is precisely the difference between a balancer and a manipulator.
No. The capacity of a device is the load you may attach in operation; the safety factors are contained in the manufacturer’s design. What matters is that workpiece and lifting attachment are included in full.
Horizontally from the column axis to the load’s centre of gravity in the least favourable position – that is, where the part is picked up or set down furthest away.
From the CAD model or by a suspension test: hung from two different points, the part settles each time with its centre of gravity below the suspension point; the intersection of the two plumb lines is the centre of gravity.
Load, reach, cycle time – plus grippers for anything without a catalogue entry.
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Open calculatorOne short conversation usually settles more than three quotations. Call or write — you will reach an engineer directly.
Start typing – for example “balancer”, “SAP” or “pipe stress”.
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