Calibration Start and End Angles for disk probes

[Irongrid]

Again I am new for disk probes is there a preferred angle range being they are not spherical it puzzles me.

[bfire85]

I have an 8mm disk and I have my start angle at -5 and end angle at +5.

[Douglas]

on a 25mm disc I went with -3 and +3.

[AndersI]

If your disk probe is really a slice of a cylinder you have a problem. PC-DMIS assumes the disk is a slice of a sphere.

[pcdmisstudent]

hello

you can use this calculation to figure out ur start-end angle.


example:

18mm disc dia x 2mm thick
Calibrate using only 70% of the disk thickness (out of square comp.)

2mm x .70 = 1.4mm

half of 70% thickness
1.4mm / 2 = .7mm
Half probe dia.
18mm/2=9mm
Calculate the angle from horizontal center line to half disk thickness

SineA= .7/9
A=4.4º

Start angle -4.4º
End angle 4.4º

[Douglas]

nice, I actually made a drawing of my disc and sphere to figure out what angle contact at the corner of the disc starts, then scaled back a bit. This approach simplifies it