External threads

[[Lo...]]

I have searched and read some the posts regarding scanning threads. All of the posts are in regards to internal threads ( a threaded hole). I'm curious if the same applies to external threads. Im currently using the line method and scanning 5 vertical lines over the threads. I'm comparing it to the Cookbook method. The cookbook say to use a circle path with pitch. I assume this is the helix function. The cookbook also says "threaded bores". Im only going around the part 1 time. I just need to find a good repeatable center point of the threads for some true positions.

The problem is the 2 methods are off by quite a bit when looking just the X,Y of the center point. The cookbook says to scan 400 degrees? I don't see where you can input the number of degrees. I can do 1 rotation or 2 rotations.

[[Ri...]]

Hope this helps

viewtopic.php?f=13&t=1471

[[Ri...]]

To me, the Helix self-centering method is the best method. If you aren't able to self-center (thread size or sensor limitation) I have had great success with the linear line scans, but heavily increase the step width of the lines, and for the Outlier Elimination change it to a 1/3 Outlier, with 3 repetitions. This will allow you to use the LSQ method to evaluate the thread instead of using the outer tangential which isn't very stable.