Higher production rates means higher dust levels and because the point attack tooling system is a bursting tool and the radial system is a cutting tool, research has shown that the radial tooling system generates less dust.
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100mm Point Attack System |
130mm Radial
System |
This can be seen more clearly on the following diagram. comparing the cutting pattern of both tooling systems you can see that the slimmer radial tool has less contact with the strata than the wider point attack tool, allowing the carbide tip to cut clearance for the radial tool rather than the bludgeoning effect of its point attack equivalent.
Research has also shown that the most effective way of suppressing dust is to capture it with a spray (not a jet) at the point where dust is generated. It is therefore important to position the spray in the toolholder/block at the back of the pick/bit. (see fig.1)
The spray should be protected to avoid damage and should spray water to envelop the pick/bit tip in the cutting zone.
The spray on the radial system is located in the toolholder/block and is shrouded by the heel of the pick/bit for protection, as can be seen on this picture. (see fig. 2)
The spray on the point attack system is located outside the pick/bit. experience has shown that the point attack spray housing is prone to washing or rapid wear when pick/bit loss occurs. This leads to premature failure of the shearer drums due to loss of water pressure integrity. (see fig.3)
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Fig. 1
Fig. 2
Fig. 3