Probing Threads From CAD.

[Darrollh]

Good morning,
I am working on a program that has threads in the holes. 10-32. What is the best way to go about this without using a locator? They want the diameter and TP.

[mckenzie]

for the TP
I use an auto circle set the pitch to .03125 (1\32)
or if its a tight tolerance i use an auto cylinder setting the
length .156 (5x pitch)
depth .0625 (2x pitch)
ending offset 0
levels 3
pitch .03125

for the diameter i'd use calipers or gage pins for the minor (assuming female threads)

[Darrollh]

Thanks! That worked. Used autocylinder.

[louisd]

you guys might think I'm crazy but I take a series of y- vector hits, moving 0.003" to 0.005" down in Z for each hit, for 1.5 the pitch length (in this case 0.047") then extract the min value as minor thread root. Then I origin Z to the point that has min value. Then, finally, I measure the autocircle as mckenzie states.

[louisd]

this makes sure you hit ON the minor, the whole way down, so long as the pitch is correct.

[thomas pilc]

if you have scanning ability you can try a cylinder line scan with a max inscribe filter it should give you the min dia. as well as location if size is not important you can do a cir or cylinder with pitch as stated above if you use the pitch method its best you go around 3 times and use a least square filter

[Darrollh]

Thank you! I am going to try that.

[Darrollh]

This is with using an Open Linear correct?

[thomas pilc]

no its under cylinder