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Actually the point is not in line with the inner mounts. Vertically It falls between the mounts and can also vary up/down depending on how high you place the mount on the upright. Cross car is falls almost 2" outboard of the a arm pivots.Cross car location will also vary depending on how far outboard you place the attachment on the upright.I'll post up a drawing showing how this works with equilateral parallelogram arms. You can make the forward attachment point move wherever you need it in X,Y.& Z.
In this drawing I've exaggerated the conditions to show how this works.I've used this concept for years in machine design. It's a clean and accurate way to rotate a mechanism, when you don't have room for a conventional pivot.In the drawing the arms are 12". The attachment point on the upright moves on a 12" radius regardless of where you place it. Notice the origin of thi radius is NOT in line with the a arm pivots. It's always dependant on where it's attached to the upright. If this attachment point were moved 1 mile out, it would still only travel on a 12" radius. But the origin of the radius would also move out 1 mile.
The length of the link in the fore/aft direction can be as long as you want.once you have the points figured out in the rear view. Longer or shorter link will not bind once the rear view is set.
thats right Bloke! I thought the same thing once I submit the post.I get phone calls from the guys in the land of OZ all the time. Love talking with them! I really do.Yeah maybe for too long! I talk more like a Canadian than anything... Aye?
Spot on? you been hanging around those OZ guys too much.
Eng or anyone, can you give a formula for the calculation of the sweet spot/axis?