The realisation of inspection gauges and fixtures projects go through different phases. During the execution of each phase Metronom Pacific supports its clients with the necessary know-how to achieve the project’s goal within the planned realisation time and within the available budget.

 

1. PROJECT DEFINITION PHASE

 

The kick-off for a gauging project is when an overall understanding exists of which components and at what assembly stage have to be measured or gauged. The computer models of the individual parts or assemblies have to be made available by the client (usually in standard CAD formats like UG, CATIA, IGES or STEP). It is also of great value if GD&T (geometrical dimensioning and tolerancing) drawings are supplied, as they define the datuming of the component on the gauge or measuring fixture as well as the tolerances that have to be achieved. The tolerances of the component define the tolerances of the inspection tool, which usually lie between a third and a tenth of the tolerance values of the component. In some instances, depending on the complexity and volume of the project, a set of specifications is issued to define all the necessary details and the scope of delivery.

 

Fixture design sample

 

Here a list of important details that has to be defined in the early stages of the project:

 

  • Where will the fixture be located? (Shop floor or metrology room)
  • Temperature range to which the measuring tool will be exposed to.
  • Other environmental factors (humidity, exposure to dust, vapours, etc.)
  • Material specifications for the contact/mounting points, e.g. material, surface finish, hardness, etc.
  • Will the gauge be stationary or will it be used in different locations.
  • How will it be moved from one location to the other: hoist, fork lift, caster wheels, etc.
  • Tool repeatability specifications (R&R)
  • Evaluation procedure for tool repeatability.
  • Weight restrictions for the tool.
  • Measuring equipment that will be used to measure the component, CMM, photogrammetric measurement device, surface scanner, dial indicators, feeler gauges, etc.
  • Frequency of measurement.
  • Required measurement cycle times.
  • Frequency of re-calibration of the gauge.
  • Life expectancy of the inspection gauge or fixture.
  • Available lead time.

 

2. CONCEPT AND PROPOSAL PHASE :

 

Fixture design and project management

 

1. Development of the measuring and gauging strategy.

2. Determine the mounting of component onto the gauge or fixture.

3. Develop clamping procedure.

4. Measuring or gauging sequence.

5. Concept design of the measuring fixture or gauge.

6. Costing of the gauge or fixture.

7. Proposal to client.

8. Incorporation of feed-back from client into the original concept.

9. Final concept and firm quotation for the gauges and fixtures of the project.

 

Fixture design project management

 

3. PROJECT REALISATION PHASE

 

Fixture design project management1. Detail engineering of the measuring gauge or inspection fixture.

2. Development of manufacturing drawings for all the special components needed to assemble the fixture or gauge.

3. Bill of material (BOM)

4. Inspection and validation points.

5. Approval of customer.

6. Final drafting.

7. Manufacture of all the necessary special components.

8. Delivery of special as well as standard (ALUFIX) components.

9. Assembly of the fixture or gauge.

10. Calibration of all mounting as well as gauging points.

11. Final inspection report

12. Commissioning of the gauge or fixture.