Sandvik has developed a new range of bits for drilling raise boring pilot holes.
Dubbed the RR880, the focus of its new design has been on improving gage protection in order to overcome the issues associated with gage wear and resulting bit change outs.
“Most raise boring applications begin with the drilling of a pilot hole; the general length of a pilot hole varies from 30 – 1000 meters, with standard drill pipes of 1.5 meter length,” Sandvik explained.
“The time and cost involved in pulling the pipes out from a deep pilot hole is significant and the service life of pilot bits is therefore crucial when it comes to keeping down cost and time for any raise boring project.”
The RR880 bits provide increased durability and hole straightening, with up to 35 per cent longer bit life than its predecessor, slashing the time and cost of changing tools, Sandvik claims.
“With the new Sandvik RR880 pilot bits, you can drill longer between bit changes. Fewer bit changes means shorter project times and increased profit at the end of the day”, Göran Strand, product line manager for Sandvik Mining, said.