Difference between revisions of "The Limitations of Qualifying Tube Shapes using Bender Data"
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The tube fabrication industry rarely uses bender data to qualify part shapes because doing that '''requires the use of angles''' in the qualification.<br><br> | The tube fabrication industry rarely uses bender data to qualify part shapes because doing that '''requires the use of angles''' in the qualification.<br><br> | ||
− | + | The problem with using angles for qualification of tube shapes, is that '''properly qualifying tube shapes with the angles in the bend data is a process that is always dependent on the magnitude (or length) of the straights between bends.'''<br><br> | |
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Revision as of 15:25, 29 March 2018
This page explains the major limitations of using bender data for qualifying tube shapes.
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Contents |
What is Bender Data?
Bender data is the data used to setup tube bending machines. Usually, bender data has at three major columns of data - the LENGTH between bends, ROTATION planes between bends, and BEND ANGLE columns. These columns can be used to define the shape of a tube and setup a tube bender.
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The Limitations of Bender Data for Qualifying Tube Shapes
The tube fabrication industry rarely uses bender data to qualify part shapes because doing that requires the use of angles in the qualification. |
Illustration of the LimitationLook at the bender data on the right. The two sets are not the same because I've made the MEASURED rotations to be exactly one degree off of the nominal or MASTER data. |
Visually Demonstrate the Problem of Qualifying with Angles
Unless you can perform 3D trigonometry mentally on-the-fly, the answer to the question above isn't obvious. Even if we guess the answer, we can not accurately guess at what tolerance envelope value the part would be considered acceptable. |
This second alignment image shows the part with IDENTICAL ANGLES - but the two middle straights are lengthened to 10 inches between bends. |
The Best Data for Qualification
The best data for qualification is centerline TANGENT POINT and MIDPOINT data in the Inspection Data menu and in the Reports menu. |