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 | + | The tube fabrication industry rarely uses bender data to qualify part shapes for a very good reason.<br><br> |
− | The problem with using | + | The problem with using bender data for qualification of a part shape is that it does not help you know if a part is inside or outside of the tolerance envelopes. Tolerance envelopes indicate specific places in XYZ space where the tube must follow as closely as possible (or at least within tolerance).<br><br> |
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Revision as of 15:29, 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 for a very good reason. |
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. |