Our bit reamer stabilisers are designed to centre and stabilise the bit during the pilot hole cycle. They incorporate multiple carbide-tipped rollers that are able to cut and size the hole to finished dimension, effectively compensating for minor pilot bit wear. With a properly sized pilot hole, normal wear on the stabilisers can be reduced. Joy bit reamer stabilisers are particularly effective in very hard and abrasive conditions.
The bit reamer stabiliser features carbide inserts pressed into hardened steel rollers that run on hardened steel shafts. All the wear items on the stabiliser, including the rollers, shafts, and retaining blocks, are replaceable.
Bit reamer stabilisers are designed to accept standard back flow valves and come with box connections to suit standard pilot bits.
Raiseboring steel
The steel used in the production of our drill rods is vitally important because rods must be able to withstand tremendous loads. Understanding that not all steels of a specific grade are produced to the same quality level and knowing the catastrophic effects of a drill string failure, we are committed to providing value to you through high-quality products demonstrating durability and strength.
State-of-the-art specifications
Since the manufacture of the first raiseboring machines, we have been developing and refining the material specifications for steel used in the production of drill rods. With an uncompromising commitment to product quality, our engineers and metallurgists work directly with qualified steel mills to continuously refine the melting, ingot pouring, forming, heat treating, and testing processes. The result is a steel product that balances high strength and toughness, developed specifically for our customers in the raiseboring industry.
Two grades of steel available
Products are offered in two distinct grades of steel, according to the size of the drill and the size of the shaft. Standard strength steel is an AISI 4145H modified grade with chemistry that has been altered to produce a deeper hardening level when heat treated. Standard strength steel is formed by the rolling process and provides 758 Mpa (110,000 psi) minimum yield strength for machines using drill string up to 286 mm (11.25 in.) diameter.
High strength steel is an AISI 4330 modified grade that is produced exclusively by open die forging. The forging process presses and forms the ingot, reducing the ingot diameter significantly. The forging process produces a highly refined grain structure in the steel that cannot be achieved from the rolling process. When quenched and tempered under closely controlled conditions, sigh strength steel has very favourable hardening properties, combining high strength with high toughness.