Surface profile

[dishbear]

Hi. Have PC-DMIS 3.5 Rel 2 with a Brown & Sharpe GAGE 2000 manual CMM. I have a part to measure, have one plane, two circles which are datums. My ? is that I have a surface profile callout of a surface around the circles. How can I workout this? I checked the Help and do not address my issue. All that I obtained is 0.0000

Thanks.

[Don Meredith]

How many hits are you using to construct the plane? If only three, profile will always be perfect. Try eight hits for your plane.

HTH

[dishbear]

The surface profile callout is .040 to a curved surface of a .220 radius. There is no possible plane callout on that surface.

[kmcmm]

Can you post a screen dump of the CAD model? Unless you have CAD it is going to be difficult to check the profile of the radii. I am assuming that all of your features are normal to the Z plus axis.

[dishbear]

Yes all features are normal to Z axis. About the CAD, how I can do that from the machine, or the CAD is something I have to bring from outside?

[kmcmm]

Yes all features are normal to Z axis. About the CAD, how I can do that from the machine, or the CAD is something I have to bring from outside?

Normaly when reporting surface profile you need CAD to establish the nomianls, unless it is a profile with a basic dimension on a linear distance. You pick the points off of the CAD models to get the nominals and I usually use the T value to report the profile. This will be difficult using a manual machine since the points need to be taken as close to the nomnal position that was picked to CAD. If you have CAD and need additional help PM and I will give you my e-mail.