Advancedtubular Glossary
Written by Michael Cone
Updated at March 19th, 2026
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This is a auto-generated Article of all your definitions within the glossary.
Glossary
This is a auto-generated Article of all your definitions within the glossary.
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Additive Inversion
Additive inversion means to multiply any value by negative 1. Example: -10 is the additive inverse of +10. +10 is also the additive inverse of -10.
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AS9100
AS9100 (Rev D) is the aerospace quality management standard built on top of ISO 9001. It is designed to specify organizational control of metrology laboratories.
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Centerline
In the context of a bent tube, pipe, or rod, this refers to the centerline of a tube shape.
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Conical Seats
Conical seats are machined countersinks that allow ball probes to be seated precisely.
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CTE
CTE describes how much a material expands or contracts per degree of temperature change. Usually expressed as µm/m/°C (or in/in/°F). For metrology, it matters because a sphere that expands or contracts between your first and second scanner setup will introduce registration errors in your leapfrog. Materials with low and consistent CTE hold their geometry better across temperature fluctuations on the shop floor.
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end point
In the tube fabrication industry, end points are the tube end locations on the centerline.
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envelope tolerance
An envelope tolerance is a tube-shaped space around the tube that is slightly larger than the tube. This tolerance is specified as the distance from the surface to the envelope on one side of the tube. (Note that GD&T tolerances for surface profiles are always double the tangent tolerance.)
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ISO 17025
ISO 17025 is a specification for accreditation for laboratories. See https://www.iso.org/standard/66912.html It is does not apply to software vendors like Advanced Tubular Technologies.
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Leapfrog
The process of moving a measuring device in the middle of a measurement without losing its location in space.
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Radial growth
The phenomenon where the bend radii increase during bending.
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tangent point
In the context of tube shape, a tangent point is the centerline point where a straight meets the start or the stop of a bend.
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XYZ
In the context of tube shapes, XYZ coordinates usually refer to the centerline XYZ points that define the shape of a tube. They are composed of end points and intersection points.