Hi domad! Yes it does. Thanks once again!
I realised after sleeping on the problem that I hadn't quite gotten things 100% correctly pictured in my mind (what was produced by you guys was 100% accurate to what I was describing!, I just realised later that I'd slightly missed something). Essentially I realised that points A and B are not exactly what they need to be. If one looks at the end face that is provided, it is essentially a surface of some thickness and 2 horizontally running, parallel edges (kind of like a rail). I realised that when one makes the central cross section thickness larger, one moves point B around, and that this results in point B moving inward/outward in R (where R is sqrt(xx+yy)). This is fine, however, I realised that if B moves to a new R value, A and C need to also move such that whilst remaining on the rail, they follow the same R value as B. The truth is that the 'end face' I provided is actually not the true end face of the component, rather, it's a helpful section of the actual end face of the component that helps me to orient the guiding rail correctly in space. I didn't realise at the time that using the end point of said rail is actually incorrect, as mentioned, due to said end point not following the same R value of B.
What I have been doing today is to make a ruled plane between the 'guiding rail' (done) and extending it outward (done). However, I've been struggling to convert it into a sketch, such that I can define a new point A' somewhere on said guiding rail (as opposed to A just being the end point of the rail). I've also had thoughts of skipping this step of making the end face into a sketch, and just making a draft(?) point, and somehow (without the need to make a sketch), fix the point to always lie on the rail, whilst following a rule on its value of R (hence setting its x and y and hence position along said edge).
This new point (let's call it A' and C') would then be the ones that I make the arc through (which by the way has been working absolutely as intended, thank you!).
Hope that was clear
Edit: Another way to look at this is to say that there is some cylinder centred on the Z axis with B on said cylinder, that intersects the guiding rail, at which point the new point A' would be defined.
Cheers,
Chris
If I make a draft point, is there a way to constrain it to be on an edge or a wire (in such a way that it could be moved along it but not off ot it?)