counterbore

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Related to counterboring: spot facing

counterbore

[′kau̇nt·ər‚bȯr]
(design engineering)
A flat-bottom enlargement of the mouth of a cylindrical bore to enlarge a borehole and give it a flat bottom.
(engineering)
To enlarge a borehole by means of a counterbore.

counterbore

To enlarge a hole to receive the head of a bolt or a nut.
References in periodicals archive ?
Important to note: The [pounds sterling]47 counterboring insert geometry is designed for use with Walter's own tooling systems, the BoringmEmum (for drilled holes from 20 to 153 mm) and BoringMAXI (holes from 150 to 640 mm) (although they can also be used for turning).
Many pipelay contractors are benefiting from working closely with experienced, independent measurement specialists such as OMS, helping them to avoid a range of potential issues such as wall thickness problems in SCR and flowline pipe, counterboring of SCR pipes and poor fit up on board 'J-lay' vessels.
Table 6: World Recent Past, Current & Future Analysis for High Speed Steel (HSS) Metal Cutting Tools by Product Type - HSS Milling Tools, HSS Drilling Tools, HSS Tapping Tools, HSS Reaming & Counterboring Tools, HSS Gear Cutting Tools, and HSS Broaching Tools Markets Independently Analyzed with Annual Sales Figures in US$ Million for Years 2006 through 2015 (includes corresponding Graph/Chart) II-41
Visit Tri Tool at OTC May 5th-8th at booth 2225 to learn more about the latest in CNC counterboring technology.
Countersinking: Countersinking is similar to counterboring except that the step is angular to allow flat-head screws to be seated below the surface.
For example, a four-sided tombstone with one part mounted to each side requires 12 different tools for roughing, pocketing, drilling, counterboring, and tapping operations.
Services provided include weld procedure development, fabrication, automatic ultrasonic testing, field joint coating, pipe end dimensioning, matching and sorting, counterboring, pipe handling and loading.
For example, drilling a hole has been reduced to one operation from the equivalent of over 20 instructions, including selecting tools for countersinking, counterboring, drilling, tapping, and toolchanges.
They are used in through-holes to perform backboring or counterboring functions in addition to drilling, chamfering, and threading.
The shoe production process, including piercing, notching, and counterboring operations, starts with shearing of the appropriate length from custom cross-section bar stock.
All drilling, reaming, surfacing, counterboring, and broaching operations were performed with the roll housing held in the correct aircraft/pod attitude.
Powered by a 10 hp 6000 rpm geared spindle, the TraveI Master enables the user to perform machining operations such as drilling, tapping, reaming, milling, boring, or counterboring without breaking the setup.