Arc length dimension??

[AquaticPeanut]

This has never happened before and I can't get it to happen again,but......

I this 1 particular assembly SW keeps giving me the wrong arclength dimension.

Using a very quick and easy (for me anyway) equation that uses 2 arc length 'driven' dimensions I determine what size v-belt I need to use to drive the reel. As I said on all but this 1 occasion it has work perfectly for me.

As you can see from the 2 attached pics, when I select the arc length dimension the value is correct(pic 1) but as soon as I place the dimension, the size changes to what appears to be the short side of the arc(the piece that isn't there)(pic 2)

 

[AquaticPeanut]

Sorry
Here are the pics

 

[AquaticPeanut]

OK no idea why the pics are not uploading.
I'm not getting error messages

 

[AquaticPeanut]

Try this

 

[SnowCrash]

When things like that happen to me it often turns out to be a sketch relation has been automatically added as things move around. Check to see if extra relations are in place for the one that does not work vs.the one that does.

--
Hardie "Crashj" Johnson
SW 2011 SP 4.0
HP Pavillion Elite HPE
W7 Pro, Nvidia Quaddro FX580