counterbore


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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 ?
A new "smart" tool in SpaceClaim recognizes standard-sized holes in imported geometry, as well as recognizes chamfers, counterbores, and countersinks.
For example, a counterbore locking fastener arrangement secures a flywheel, weighing several thousand pounds, to canning machinery.
Static phase contrast images such as those shown in Figure 4 were used to measure the hole and counterbore diameters, the size of the mini-sac, and the inclination angles of each of the holes.
The bolt face counterbore wall of the Model 75 has two slots--one for a spring-loaded extractor, another for passage of a fixed-blade ejector located in the floor of the receiver bridge.
The company says along with the new speed prep feed system is a precision ID mount end prep machine tool designed to bevel, compound bevel, J prep, face and counterbore pipe, fittings and valves.
With the stretcher in place against the cleats (C), drill recess holes (counterbore holes) and 9/32-in.
To mill this counterbore we are using a 0.750" diameter 4-flute end mill.
In the new design, the holes are formed with a lead-in chamfer to facilitate pushpin insertion and a counterbore formed inside the hole that creates a shoulder to hold the pins in place.
where [p.sub.c] the back pressure built up in the counterbore as the plug enters it, and [A.sub.c] = the effective area under pressure.