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. The time and ...
A 76-page catalog from Criterion Machine Works covers precision boring systems ranging in diameters from 0.50 to 21.5 in. for the production floor and tool rooms. The publication also highlights ...
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