Easy question...

[Farmer]

...hopefully. Im still fairly new with Dmis. I simply need to know how to measure the wall thickness between the Datum B hole and the Datum B Rad (Please see Att.)? Both have been measured as circles.

Thanking you in advance.



F.

[Tested]

...hopefully. Im still fairly new with Dmis. I simply need to know how to measure the wall thickness between the Datum B hole and the Datum B Rad (Please see Att.)? Both have been measured as circles.

Thanking you in advance.



F.

You should be able to do a distance "minus radius".

[george frick]

....or you can use assignments to subtract the radii from each other......or you can use a set of pin mics.

[Wes Cisco]

Another way that could be very usefull if you need the thickness at a specific location would be to construct an line from the center of the radius to the place on the od, ( or in space), that you want the thickness checked. Then construct pierce points for the places the line pierces each radius. Now you can dimension the distance between the two pierce points.
OR..... you could use a UT mic, (ultrasonic). The CMM is a great tool, but there are some things it does not do as well as good old fashioned manual methods. In this case, pin mic as George said, or UT mic will be faster and quite likely more accurate. HTH

[cmmguy]

It depends on how "out of round" the two features are. If they are out of round then you must use a method that physically measures the wall thickness and not any calculation method.

If ID is round: Measure ID, Measure Point on OD, calc distance, subtract ID radius and tip radius from Distance, repeat as necessary.

IF ID not round, use ball mic or calipers.

[Farmer]

Thanks all!

In the end I just created points and measured the distance between. It took a bit of figuring out (Paralell line then reverse line etc) but I got there in the end. Im trying to figure this stuff out on my own here so this forum is invaluable to me.

Thanks again,


F.