Autodesk Inventor

[#1]

I was just doing some drawings and found a very strange dimension.

See the attached pic. Its the dimension in section J-J (lower Left) It is supposed to be the same as the dimension in Section H-H but as you will see the dimesion it gives is a little strange ... lol

[#2]

No idea what happened there.  However, standard drafting practice is to dimension to centerlines of holes, not to section edges.  That might give a better result.

[#3]

Thats a radius dim it putting on the cut edge.  Section J-J is not truly vertical and the view it is cut from in not truly horizontal. Edit the view and rotate it so that the fins are horizontal. Edit the sec line J-J and add a vertical constraint and anchor it to the center of the hole.

[#4]

Sam, you are quite correct, in fact I had already added a centerline bisector and re-did both dimensions without error. I just thought it was strange to see such a dimension ... lol

karthur1, I very much doubt that it was picking up a radius, certainly not with that dimension. A 191metre radius is a bit big for these drawings ... lol