1. How To Calculate True Position

True position is probably one of the most used tolerance tools in any CMM software and depending on which industry you're in, you've probably used this tool on every program that you've created for so many years.As long time CMM users we all know the magic formula to calculate TP value from deviations from each axis (and of course we need to double it at the end). This formula works no problem if your features (e.g. Circles) are 2D, but have you ever double checked how it works on 3D features (e.g. Circles with compound angle to your co-ordinate system)? When I was doing on-site support recently, one of the QE brought up this question: how come the final TP value from PC-Dmis doesn't seem to be calculated correctly from the deviations of 3 axis?

How To Calculate True Position

Install esxi software raid program. Hi,FL150, QNH 993hPa: altitude in ISA conditions = 15,000 - (20 x 30) = 14,400ft.On CRP5: In ALTITUDE window put altitude (14,400ft) next to temperature (-30?C).Go to ISA altitude (14,400ft) on inner main scale and read true altitude next to it on out main scale: 13,660ft.On calculator:Difference between ISA altitude and true altitude = 4ft per thousand ft per degree of ISA deviation.FL150 ISA = +15? Deviation = ISA -15?C.True altitude = 14,400 - (4 x 14.4 x 15) = 14,400 - 864 = 13,536ft.Baz.