Borecentric Tubing

The Borecentric process follows the curve of a tube while drilling, maintaining incredibly tight tolerances.

The Borecentric® process is the ability to follow the curve of a tube while drilling and maintain incredibly tight tolerances.

This proprietary process was originally developed to satisfy the exacting tolerances of the nuclear industry, in particular, tube hollows for nuclear fuel tubes. The industry had many specific design requirements for the tubing, but standard drilling techniques did not meet them at the time. That is why Dearborn developed our proprietary technique to meet the strict criteria.

The Borecentric process does not remove material from the OD in order to create a uniform wall, so valuable material is not wasted, and no costs are incurred to machine the OD of the tube.

If your tubing requirements are not available in “stock” tubing, or if you cannot find the desired wall thickness, we can begin with either barstock or mill-supplied tubing and then machine a precision tube to your specifications.

This cost effective method of improving input tube hollows or mill-produced tubing can represent considerable cost savings when working with expensive nickel or titanium alloys. Dearborn can provide the precise material, size, straightness and wall thickness that you need for your project and specifications.

  • In an eccentric tube, all of the material in the “thick wall” that exceeds the material in the “thin wall” of the tube is wasted. Dearborn can machine uniform tube walls, rather than the typical +/-10% variation, so excess material is not needed
  • Extrusions with non-uniform wall thicknesses can be repaired by removing material from the ID only
  • Tubes where the ID was created by trepanning can have the cores returned to the customer to be processed into additional parts, saving downstream materials costs
  • Close tolerances are available for ID and OD size and finish, in addition to tightly controlled wall thickness variation
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The Borecentric process follows the curve of a tube while drilling, maintaining incredibly tight tolerances. | Dearborn, Inc.

Type 1

Type 1 is tubing which is bored through the entire length in a straight line, and has the bore concentric to the OD at both ends. (the OD would still have its original bend or bow).

The Borecentric® process is the ability to follow the curve of a tube while drilling and maintain incredibly tight tolerances | Dearborn, Inc.

Type 2

Type 2 is tubing which is bored through its entire length with the bore concentric to the OD throughout. This type does not necessarily have a straight bore, but has a uniform wall thickness, and may have a bend or bow throughout its length.

If your tubing requirements are not available in “stock” tubing, or if you cannot find the desired wall thickness, we can begin with either barstock or mill-supplied tubing and then machine a precision tube to your specifications. | Dearborn, Inc.

Type 3

Type 3 is tubing which is bored in a straight line, concentric to the OD at the ends, and having the OD turned or ground in a straight line, which is concentric to the ID.