LUCKNOW, India (AP) — Rescuers drilled deeper into the rubble of a collapsed road tunnel in northern India on Friday to fix wide pipes for 40 workers trapped underground for a sixth day to crawl to ...
Melting holes is sometimes a better option than drilling them. Thermal drilling relies on friction from a carbide bit to melt and extrude metal and form a hole. The process leaves a thicker lip around ...
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