I meant to send this file of the model.

I should explain that there are 2 groups in the drawing. The attached screenshots may help to clarify.

Mike

_propalignment11.skp

my first post here. Hello all.
I'm modelling a boat engine's mounts, the prop shaft, and all the relevant adjustable points that allow me to align the engine transmission with the prop shaft to a very close tolerance, typically a thou, or .03mm. I've set the precision to .00mm giving me accuracy to a hundredth of a mm.

My problem is this: When I rotate the model, the dimension lines reflect it accurately until the rotation is less than .05 of a degree. When I go below this value, the dimensions show inaccurate and irrational results. Typically, this is the area I need to work in.

Has anyone else experienced a similar problem, and if so, how do I work around it? I've tried going 5 degrees of rotation, then coming back 4.99 degrees, but the same inconsistent dimensions remap themselves.

I'd hugely appreciate any help on this one. TIA

Mike