hollow drill

hollow drill

[′häl·ō ′dril]
(design engineering)
A drill rod or stem having an axial hole for the passage of water or compressed air to remove cuttings from a drill hole. Also known as hollow rod; hollow stem.
References in periodicals archive ?
HIT-RE 500 V3 also has what the company contends is highest published load capacity of any epoxy in the industry; along with HIT-HY 200, it is the second ICC approved system with the SafeSet hollow drill bit.
Tenders are invited for Carbon hollow drill steel, 1" x 4-1/4" shank x 72" under collar length with Timken H thread.
Diamond hollow drill bit forms a ring during material working, which width corresponds to the thickness of cutting base.
The tools are often designed as a hollow drill and placed in the tool holder either with a cone adaptor, a vendor-specific solution with facing systems, or placed directly onto the spindle.
The study has also revealed evidence of dental inlays: a shallow hole was drilled into the front face of the tooth enamel (using a reed or bone hollow drill and an abrasive such as sand or jade dust), sometimes reaching the dentine within.
The inner diameter of the hollow drill gradually increases from the tip to the shank end to prevent the frictional forces that can disintegrate the extracted sample.
Through this technique a hollow drill cuts out solid tubes of rock.
Internal chip evacuation through the hollow drill shaft, provided there is ample coolant, eliminates all the problems of chip binding and jamming, which often occur with conventional gundrills.
Using a hollow drill, they pulled up cores of sandy sediment that formed the ocean bottom many millennia ago.
ALLOY STEEL NESOI BARS, ANGLES ETC; HOLLOW DRILL, ALLOY OR NON ALLOY ST BARS AND RODS
Internal chip evacuation--through the hollow drill shaft--eliminates all the problems of chip binding and jamming which often occur with conventional deep hole drills.
In their study, Paull and his colleagues trapped samples in a pressurized hollow drill bit, which kept the gases from escaping or decomposing as they were brought to the ocean surface.