Probing function is easy and accurate. The point accuracy will only be as accurate as your set-up
and machines capability. Only you can define just how acurate the probing needs to be and how
automated you want the actual probe process to be.
I took a practical approach to the matter in that i wanted to be able to convinently and quickly
probe a piece to duplicate it or find dimensional information. If it is not easy and convient to do
you will not use it. Complex becomes a PITA also, so KISS applies, be pracatical for your intended
use.
I created a probing page / wizard for both the lathe and mill. A detachable index ring on the lathe
chucks allow for accurate indexing. As Russ replied, the barrel, for practical purposes, is symetrical
about the center line. If mounted in a lathe,you could probably take 30 probes on the top at 0 degrees,
15 probes at 90, 180, and 270.
The probed point data is is used by CAD to actualy draw the probe profile or just just show points.
In cad you could easily compare the probing at 90, 180, and 270 for any shape variation.
I must say thanks to Terry for the point conversion into CAD. In the end I still had to read a CAD manual
to get it to work in two different programs.
In summary here is what I do and works for me:
1. Set up work on lathe, mill, what ever.
2. Acquire point data
3. Have CAD draw the point data
4. Save as a dxf file
5. Use file in CAM or whatever program to get the GCODE.
No fancy probes and only one which allows side and point contact required ( make you owne for $1).
Make a visual one for realy fast and easy point collection, look into camera / optical techiniques.
A lot of options for doing things and YOU DON'T HAVE TO SPEND MUCH MONEY!
Note that electronic probing doesn't work on non- metallic material so you need options.
FWIW,
RICH