One of the major considerations in the design of Calibre equipment is the effect on breakout force efficiency – the technical term for the measure of structural stress on an excavator.
Put in another way, break out force is a measure of the optimum amount of force that the working attachment can exert so as to maximise the efficiency of operations, ease of use, fuel and maintenance costs and the speed in which the job gets done. It follows that getting this aspect right has a huge impact on machine life.
The break out force is affected by the weight and size of the working attachment, the cylinder size, the hydraulic pressure applied, the geometry of the linkage that tilts the attachment and the overall length/ height of the attachment from the boom. Working on these aspects give rise to other measurements of “bucket force” and “arm force”, the combination of which determines the optimum digging performance.
A machine with higher breakout force will perform generally better in a harder digging situation. However, too much breakout force will damage the machine - for instance, an excessive increase in the breakout force on a small excavator might blow hydraulic hoses, bend rams, break buckets /arm/boom and the like.
In working on Calibre Attachment designs for couplers, tilting hitches, buckets and other working attachments, our models and simulations provide us with a keen insight on the magnitude of forces at play and stresses that are set up in the structural designs.
While various brands of attachments standing side by side might not appear to differ that much, when in operation there can be a considerable variance in break out force performance. This is particularly so with couplers/tilt hitches where OEM rated break out specifications is compromised. An overweight, high profile device will severally impact the breakout force.
To illustrate the point. In one recent test – using the Calibre Sure-Grip, Ram-Tilt and Performance Package combination, there was a 9% drop in the bucket force on the OEM spec standard. When using another noted supplier ram tilt and the OEM bucket combination there was a 24% drop. It got worse with a non-OEM third party bucket - a 34% drop in bucket force.
There was a similar outcome with the “arm force” calculations - a 7% drop with the Calibre combination, as opposed to a 25% drop with a third-party ram tilt / OEM bucket combination and a 29% drop with the third-party ram tilt/ bucket combination.
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