Contour definition in inspection1/12/2024 A properly designed fixture empowers the employee to separate good parts from bad parts regardless of the complexity of the tolerance scheme and associated features. The operator should be able to read the fixture and quickly determine a part's conformity to the specification. This is accomplished without the involvement of supervisors, a quality team, or any discussion. A properly built fixture not only gives the operator enough information about the part so he has confidence in what he is building, but also helps him prevent building a poor-quality part. What Fixtures DoĪ check fixture is a quick-to-use, easily understood tool that ensures the part is built to the customer's requirements. No translation is required when fabricators use a hard fixture. The staffs of many factories and fabrication shops are multicultural and multilingual. The simplicity of a check fixture transcends language differences or cultural dissimilarities. If the tube fits into the cavity, the part is correct if it does not fit, it is not correct. With a properly designed and constructed fixture, tube fabricators require little discussion or training to confirm the dimensional accuracy of the tube, whether it is a simple part or a complex assembly of several tubes. As the pressure increases to squeeze more value out of every expense dollar, tube fabricators rely increasingly on hard fixtures, partly because these tools provide in-process control as well as final audit verification. For tube fabricators, an attribute fixture is an increasingly important part of this focus. Additional hardware, such as the items located at each end and in the middle of the tube, can be used for verifying the locations of specific tube features.Īs the manufacturing environment becomes increasingly competitive, fabricators become increasingly focused on productivity, which often takes one of two forms: produce correct parts without rework and prevent the scrapping of good parts. The body of the fixture checks most of the contours and features. Figure 1: A full-contour fixture makes contact with the tube along its entire run, end-to-end.
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