{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8463421","patent":{"patent_number":"US-8463421","title":"Drilling apparatus and methods","assignee":null,"inventors":[],"filing_date":"2007-06-22T00:00:00.000Z","publication_date":"2013-06-11T00:00:00.000Z","cpc_codes":["G05B","B23Q","G05B","G05B","G05B","G05B"],"num_claims":29,"abstract":"The present invention provides a method of drilling a hole in a workpiece in order to control breakthrough of the workpiece comprising the steps of: a) initiating contact between a drill bit of a drill unit and the workpiece; b) operating the drill unit to rotate the drill bit to drill the workpiece; c) during drilling of the workpiece measuring the force, F and torque, T, experienced by the drill bit; d) calculating a variable F′, based on the measured force, F, representing the rate of change of F; e) calculating a variable, T′ based on the measured torque, T, representing the rate of change of T; f) calculating a variable F″ representing the rate of change of F′; g) calculating a variable T″ representing the rate of change of T″; h) detecting the onset of breakout of the workpiece by use of the variables F′, F″, T′ and T″; i) thereby controlling the speed of rotation of the drill bit during breakthrough of the workpiece to control the degree of breakout of the drill bit from the workpiece. A drilling system is also disclosed."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Drilling apparatus and methods","description":"The present invention provides a method of drilling a hole in a workpiece in order to control breakthrough of the workpiece comprising the steps of: a) initiating contact between a drill bit of a dril","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8463421","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8463421","citation_suggestion":"Patentable. \"Drilling apparatus and methods\" (US-8463421). https://patentable.app/patents/US-8463421","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8463421","json":"https://patentable.app/api/llm-context/US-8463421","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T05:56:03.274Z"}