Apparent Intersection Measurement

[matthewcsmith]

I need to measure the apparent intersection of a conical surface intersecting a flat plane surface. I've built a jig which I can use to secure in place to fit the geometry, then measure the sharp corner intersection. It works reasonably well, but is somewhat cumbersome and does not work for the inside corners.

I'm looking for a tool or method accurate to within 0.010" or better.

I've attached 3 pictures of the measurements I'm trying to take. Both 3" and 4" dimensions are what I'm trying to do. The corner radii are not very accurately made and cannot be used to reference really.

Female:

http://files.engineering.com/getfil...1-6763-4972-b043-4b9c3426071c&file=FEMALE.jpg

Male:

http://files.engineering.com/getfile.aspx?folder=a06171d2-d01d-491f-80a4-358d367b75b9&file=MALE.jpg

Section:

http://files.engineering.com/getfil...-28e2-43db-92b3-b9a5cd036683&file=SECTION.JPG

Does anyone know of a method or tool to make this measurement?

Thanks,

Matt

Matt Smith
Mechanical Engineer
'04 RHIT Grad

 

[hydtools]

matthewsmith,
Make a sharp edged gage disk, diamter 3.500in., thickness .750in. so the gage is always above the part surface. Set the disk in the female cone. Measure the distance from the top of the gage disk to the part surface. By geometry D = dg + 2*lg - 2*y. The variation of D will be twice the variation of y, so y must be measured to less than .005in. for calculating D to .010in..

D is the large diameter of apparent intersection at the part surface
dg is the diameter of the gage
lg is the length of the gage
y is the measured distance of the gage above the part surface

Do a similar method with a gage ring for the male part.

Ted