Drilling operator Eric Todich agreed with Bass's assessment of the controls, and said, "The reaction with the 123RH C raise drill
is quicker, yet it takes time to adjust after the command.
With a continuous operating torque of 900 kNm (670,000 ft-lb) and a thrust capacity of 22,000 kN (5,000,000 lb), the machine is nearly 50% larger than any existing raise drill
, according to Macmahon.
The 34RH is a small diameter raise drill
ideally suited for slot raises, back filling and narrow vein-mining applications.
Marketed since 1984 by Quebec-based Machines Roger International, the V-30 raise drill
is based on DTH hammer technology, with a difference.
Terratec Asia-Pacific Pty Ltd is currently developing a new down/up raise drill
in conjunction with Mount Isa Mines Ltd, for reaming in both directions.
Atlas Copco also displayed the new Robbins 44RH raise drill
, which has been designed to fulfill the demand for high-powered raise drilling in confined spaces and has been designed with the operator's need for increased safety, as well as efficiency.
3, 1991) gives details on the first raise drill
automation package which has been operating very successfully in Australia.
Isa Mines in May 1991, when Robbins engineers in the company's Seattle, Washington, offices linked up via computer with a Robbins raise drill
Rucbor used a Wirth HG 330 SPII raise drill
(see table), a 12-7/8-in.
The second hole reamed for that raise was 2,106-ft-long X 11-ft dia making it the largest by volume and the longest raise ever mined by raise drill
Although an ancestor of the modern raise drill
was tried out in Germany in 1949, the most important breakthrough was the Cannon/Robbins raise drill
has developed packages offering semi- to full automation of raise drills