rathole

(redirected from Ratholing)
Also found in: Dictionary, Thesaurus, Wikipedia.

rathole

[′rat‚hōl]
(mining engineering)
A shallow, small-diameter, auxiliary hole alongside the main borehole, drilled at an angle to the main hole; after core drilling is completed, the rathole is reamed out and the larger-size hole is advanced, usually by some noncoring method.
References in periodicals archive ?
Oil-lubricated, oil-cooled gyrators induce flow and eliminate bridging and ratholing.
Their Rotoflo discharge unit provides a versatile, efficient, precisely controlled and reliable solution to silo discharge problems as it eliminates core flow, bridging, ratholing and the possibility of stagnant areas, without recourse to vibration or aeration.
Problems with arching and ratholing in bins and hoppers can lead to erratic flow or complete flow stoppages.
Paddle action gently massages material down into the metering screw, eliminating ratholing and bridging, while conditioning material into a uniform bulk density.
Limiting (worst-case) conditions for ratholing can be encountered after storage and hold periods, which are typically a part of manufacturing operations handling powder blends in bins.