Birmingham Prototypes quality manager Bob Rose using a Nikon Metrology MCAx measuring arm with a hand-held laser scanner.
Laser scanning an automotive stamping at Birmingham Prototypes with an LC15Dx laser scanning head.
When youâre doing production prototype work for Jaguar Land Rover (JLR), youâve (1) got to be good and (2) youâve got to be able to prove it.Â Which is what Redditch, U.K.-based Birmingham Prototypes discovered when it began to supply JLR with stampings and brackets a few years back.
According to Mick Adams, managing director of Birmingham Prototypes, JLR wanted bothÂ first article inspection and production part approval process (PPAP) documentation.Â Detail on component accuracy and repeatability required was much moreÂ than had been the case with other customers.
Doing the tasks with a manual CMM and Microsoft Office applications was taking a considerable amount of time, as much as a day for a single report.
Clearly, something had to be done, so they installed a ceramic bridge CMM, a model LK V 15.10.8, from Nikon Metrology (nikonmetrology.com).Â The unit is equipped with an LC15Dx laser scanner, whichÂ is the default tool for measuring the components.Â When there are tight tolerancesâor sometimes when doing initial part setup on the CMMâa touch probeÂ is selected from the stylus changer on the CMM with a Renishaw PH10M motorized indexingÂ head.Â While most of the drawing tolerances on the stampings are fairly openâÂ±0.25 mm on surfaces and Â±1 mm on trim edgesâhole positions are measured to within tens of microns, which is readily accommodated by the LK CMM.
The machine uses multi-sensor CAMIO V8 software, which produces DMIS programs for both laser scanning and touch probing.Â Nikon Metrology Focus 10 software manages the point clouds acquired during laser scanningâand know that a prototype aluminum engine bay mounting plate for a Jaguar car is on the order of seven- to eight-million points, so there is a considerable amount of managing.Â The Focus 10 software allows comparison of the CAD model and the partÂ as produced (and scanned).Â There are color maps with annotations generated of the comparison.Â
To bring in work that it had outsourced, in 2015 Birmingham Prototypes added a five-axis laser profiling machine from Trumpf (trumpf-laser.com) to its shop floor.Â Noted Adams, âPractically every job that comes off the machine is a unique prototype that needs to be inspected, a job that was previously done by the laser cutting contractors.â
So Adams said that they decided to acquire a portable CMM arm, a Nikon MCAx, to handle the parts from the laser cutter.Â This unit is a 7-axis counterbalanced arm with continuous rotation; it offers a four-meter diameter measuring envelope.Â It is usually used with a digital laser scanner; a touch trigger probe can be used should additional accuracy be required.Â The arm is equipped with absolute encoders to assure precision.
Beyond measuring, Birmingham Prototypes is using the laser scanner to generate CAD models of parts that have no drawings or digital files.Â This is then used to create STL files.Â These files are used by the companyâs Dimension 1200 es 3D printer from Stratasys (stratasys.com).
There are also four CNC machining centersÂ from Hurco (hurco.com) at the facility that are used to manufacture both prototype tooling as well as low-volume production components.Â The Nikon Metrology CMMs are used to check theseÂ components, as well.