Notching definition

Notching a pillar means cutting enough coal out of the center of a pillar to allow the release of the stress that naturally and dynamically builds in a pillar as active mining around it forces it to absorb overburden pressures. A notched pillar converges upon itself in a controlled manner so that the likelihood of a sudden outburst of coal or "bounce" is reduced. Pillar notching can be hazardous depending on the circumstances, but those hazards can be minimized by limiting the number of miners near the pillar while the notch is being cut.
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Examples of Notching in a sentence

  • Circular saws; Using the circular saw; Circular saw blades; Special saw blades; Crosscutting; Ripping; Angular cutting; Plunge cutting; Notching and grooving; Cutoff wheels; Arbors and arbor adaptors; Circular saw accessories; Safety rules.

  • Notching per [***] is permitted and shall be reviewed and approved by the launch authority.

  • Circular saws; Using the circular saw: Circular saw blades; Special saw blades: Crosscutting; Ripping: Angular cutting; plunge cutting; Notching and grooving; Cutoff wheels; Arbors and arbor adaptors~ Circular saw accessories: Safety rules.

  • Notching or through trimming shall be done only by permission of the City.

  • PARTY OF THE FIRST PART PARTY OF THE SECOND PART Painter 20.48 19.69 20.08 Welder/Fabricator 19.69 20.08 20.48 Shipper, Receiver, Purchasing 19.69 20.08 20.48 CWB Ticketed Welder 20.32 20.73 21.14 III Body Prepman 17.99 18.35 18.72 Shearing, Forming & Notching 17.99 18.35 18.72 Shipper, Receiver/Stockroom 17.99 18.35 18.72 IV Assembler 16.13 15.50 15.81 General Help 15.50 15.81 16.13 V Cleanup 9.90 10.10 Wage Categories I, III, and IV to have a twelve (12) month wage progression.