Here is my mk1 JLF octosquare. I was very happy that from my measurements of the base this fitted tightly on my first attempt. There are some visible manufacturing errors that don’t affect function which I’ve now fixed, I’ll make a prettier one tomorrow.

I would describe the above as C19.5 D20.5 R6.0 (1.05)

= Cardinal 19.5mm, diagonal 20.5mm, fillet radius 6.0mm (ratio D/C)

But now we have to note that if we want a set of numbers that describe the feel of a gate, then we have to take the radius of the follower away from the gate dimensions (a 5mm radius follower in a 5mm corner fillet gives a sharp corner)

And lets talk about throw rather than diameter,

So now I change the above (for my dia 10.6, radius 5.3 follower) to:

C4.45 D4.95 R0.7 (1.11)

Note: the ratio is now realistic, and will range between 1.00 octagon to 1.41 square

Finally we want to translate that from the gate to the handle. And as my gate is 4mm rather than 6mm thick, that will alter things slightly.

I’m going to use the figures: 48mm pivot to ball centre, 26mm pivot to my gate contact.

With a bit of rounding I end up with:

C8.2 D9.1 R1.3 (1.11)

If you keep the ratio at 1.00 and change the radius, then you are moving along a scale from octagon to circle, so maybe octoshape is a more general name to cover all combinations

Comments?

Oh yes, I think I prefer this shape to the circle for Robotron. I don’t play fighters.