All of our Probe Assemblies use 3P, 6P, and Disc Probes. We are trying to find the runout (not total runout) of a feature, but every time we change tips (Probe assembly gets a 90 degree angle), I am starting to believe there are some mechanical kinks that are not in agreement, because we would be rejecting a lot of parts if we had only a CMM to measure runout, according to the CMM. In other wordas, every time we measure cylinders at a 90 degree angle, we get bad results even having calibrated the tip x-amount of time. Everything is calibrated (just had the CMM calibrated last week actually) But I suppose now that we could use a Star Stylus as a substitute for getting tips, and not have to "get tip". The problem I am running into immediately is that all of my features, when measured, reports double. 15mm diameters are reading 28.8xxx, which is not actually true. Probe assembly is set up fine, calibrated it to our sphere; everything checks fine, but measurements are coming out absurd with this star stylus. Any ideas why??