Help calculating piston rod angle

[Roland Melkert]

Yes, you need to do a bit of trigonometry here...

Philo is right, you can't use the tool directly because you would need to know the final coordinates for a,b and c to get to an angle you don't need anymore in that situation.

I would solve it like so (almost identical to Philo's solution but without the use of the tool):

-take the x distance between a and c -> lx
-take the piston length (b-a=60) -> lp
-cos(cc)=lx/lp
-snap the piston using a to c
-rotate the piston over c using angle a 90-cc angle
-snap the piston head to b