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Tightening throws the reaction torque back. Physically this is not a question of the operator’s strength but of statics: whatever arises at the tool has to go somewhere. Without a torque arm it goes into the wrist – and at 600 newton metres that is no longer an imposition but an accident waiting to happen.
At the station, wheel hubs, assembly mounts or flange connections are tightened with a pneumatic or cordless tool. Torques range from 120 to 600 newton metres, the fastening cases change, and every tightening is to be documented. The tool itself weighs four to nine kilograms; across a shift the operator lifts several tonnes with it before a single bolt has been tightened.
The rule of thumb from practice: above roughly 30 newton metres of reaction torque holding becomes a lasting strain, above 80 newton metres it is no longer safely controllable without support. The value depends on posture and tool length – overhead or with an outstretched arm it drops considerably. We therefore measure not only the torque but look at the body posture at the specific fastening point.
The arm consists of two parts with different jobs. The spring balancer takes the weight of the tool so it stays at any height and can be guided with two fingers. The rigid torque pick-up leads the kickback through the rail guide into the structure – it is not sprung, because a springy reaction would falsify the fastening case. Together they produce a tool that feels weightless and still supports hard.
Where tightening torques have to be documented, a controller hangs on the tool and logs every fastening. For handling that means the cable travels along without snagging. We route it through an energy feed-through in the rail axis instead of a freely hanging loop – the difference between a cable people curse daily and one they never notice.
Our systems support up to 1,000 newton metres. The usual range in assembly is between 120 and 600 Nm. What matters is not only the peak value but the direction: a torque about the tool axis is led away differently from one across it, and the design of the pick-up follows from that.
Yes. The tool’s drive is irrelevant to the arm – what is supported is the reaction torque, not the energy source. With cordless tools the air line disappears, but a radio link for documentation is often added.
No, that would be expensive and impractical. One arm on a rail axis covers a working area; as soon as the operator leaves it, things get awkward. We size the area so that all fastening points of a station are reachable without repositioning – that is the limit at which a second unit becomes cheaper than the detour.
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Start typing – for example “balancer”, “SAP” or “pipe stress”.
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