Control method for drilling apparatus which makes use of a final

Details Control method for drilling apparatus which makes use of a final Control method for drilling apparatus which makes use of a final

1985-03-19

1987-01-27

Smith, Jerry

Boots, shoes, and leggings

364422, 173 39, 33 1H, 33 1CC, 33 1M, 33503, 175 24, G06F 1520, E21B 700

Patent

active

046398686

ABSTRACT:
A drilling method of drilling an imaginary facing for excavating a curved tunnel such that the imaginary facing is nonparallel to an existing facing. The drilling method includes the steps of obtaining a first equation for transformation between a primary coordinate system defined with respect to the imaginary facing and a secondary coordinate system defined with respect to the existing facing, transforming a primary drilling pattern of the primary coordinate system into a secondary drilling pattern of the secondary coordinate system, obtaining a second equation for transformation between the secondary coordinate system and a final coordinate system defined with respect to a drilling vehicle, and transforming the secondary drilling pattern to a final drilling pattern of the final coordinate system.

REFERENCES:
patent: 3823787 (1974-07-01), Haworth
patent: 4545017 (1985-10-01), Richardson

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