# US 9,038,283 B2 · Bore gage system for setting and measuring large diameter bores > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,038,283 B2 - Document ID: US9038283B2 - Status: Granted - Kind: B2 - Application number: 13/611,010 - Filed: 2012-09-12 - Published: 2013-03-14 - Granted: 2015-05-26 - Earliest claimed: 2011-09-14 - Assignees: Dorsey Metrology International - Applicants: Theodore Luty; Stephen Forschler - Inventors: Theodore Luty; Stephen Forschler - Web page: https://patentgrep.com/patent/US9038283B2 ## CPC - G01B 5/12: internal diameters - G01B 3/26: Plug gauges - G01B 5/00: Measuring arrangements characterised by the use of mechanical techniques - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS ## Abstract A large bore measuring system includes a modular and extendable bore gage with analog and digital readouts, also includes a settable set-master. The modular bore gage is designed to measure two sets of large bore diameters. A first set of large bores is accomplished by using a modular bore gage design described in this disclosure. The second set of larger bores is accomplished by adding attachments therein extending the gage for the larger range of bore diameters. A set-master is used for both sets of large bores. ## Claims ### Claim 1 A large bore gaging system for measuring two ranges of large bore diameters comprising; a settable set-master and, a protracted bore gage comprising a three part assembly modifiable for each range of large bore diameters in which, a front part comprises a centralizer, a cylindrical housing, a first measuring rod and a motion transfer device; an intermediate part comprises a cylindrical housing mounted perpendicular to said first part, a slideable rod conjoined with said motion transfer device at one end and a dial indicator conjoined with a digital gage at the other end; and an end part axially connected to the back end of said first part comprising an extension bar with an adjustable contact. ### Claim 2 (depends on 1) The large bore gaging system of claim 1 wherein said centralizer is coaxially and slideably mounted while rotationally constrained onto said cylindrical housing and spring biased forward against a stop positioned at a front end of said cylindrical housing. ### Claim 3 (depends on 1) The large bore gaging system of claim 1 wherein said three part assembly has three contact points two of which are geometrically spaced to allow accurate centering while measuring the two ranges of large bore diameters, said two contact points are placed on angled facets at a front face of said centralizer, the third is adjustably positioned at a distal end of said end part. ### Claim 4 (depends on 1) The large bore gaging system of claim 1 wherein said centralizer is slidably retractable to ease gage insertion during measurement. ### Claim 5 (depends on 1) The large bore gaging system of claim 1 wherein a centralizer is provided for each of the two ranges of large bore diameters, the angled facets and contact points are geometrically spaced to accommodate each range of large bore diameters. ### Claim 6 (depends on 1) The large bore gaging system of claim 1 wherein said intermediate part and slideable rod are replaceable with a longer cylindrical housing and a longer slideable rod to accommodating the measurement of deeper bores. ### Claim 7 (depends on 1) The large bore gaging system of claim 1 wherein said extension bar with said adjustable contact is provided to accommodate the measurement of larger bores. ### Claim 8 (depends on 1) The large bore gaging system of claim 1 wherein at least two set-masters are provided, one for each of at least two ranges of large bore diameters. ### Claim 9 (depends on 1) The large bore gaging system of claim 1 wherein presetting said set-master for each of large bore diameters, is accomplished by using a combination of certified (National Institute of Standards and Technology) gage bocks of various thicknesses wrung to each other to total up to the desired bore diameter. ### Claim 10 (depends on 1) The large bore gaging system of claim 1 wherein said combination of gage blocks are placed, en masse, onto a rail against a centering support member and against a preset adjustable diameter anvil. ### Claim 11 (depends on 1) The large bore gaging system of claim 1 wherein said set-masters comprise a supporting rail, a plurality of certified gage blocks, a frontal preset adjustable anvil for simulating a large bore curvature for a specific range of large bore diameters, a distal slideable block to accommodate adjustment for a range of bore diameters, said slideable block includes a spring loaded pin and a knob to prevent said slideable block from sliding. ### Claim 12 A method for using said large bore gage system, comprising the steps of: providing a set-master with three contacts for a specific range of large bore diameters; providing a set of certified gage blocks; providing an elongated bore gage with a dial indicator and conjoined digital indicator; providing a gage block supporting rail having a centering support member and a knob for tightening a slideable block providing data for said nominal diameter to be measured. ### Claim 13 (depends on 12) The method of claim 12 wherein a plurality of gage blocks are selected and wrung together forming a linear array equaling said large bore's nominal diameter. ### Claim 14 (depends on 12) The method of claim 12 wherein placing said linear array of gage blocks against a centering support member and sliding said slideable block against a distal end of said linear array. ### Claim 15 (depends on 12) The method of claim 12 wherein said knob is tightened to secure said slideable end block against a spring loaded pin urging said linear assembly against said adjustable anvil and removing said linear array from said set-master. ### Claim 16 (depends on 12) The method of claim 12 wherein placing said elongated bore gage on said set-master, between said three contacts, and setting the dial indicator to zero readies said large bore gage for checking a specific bore diameter.