I want to create a circle with a 40 mm CIRCUMFERENCE. Is there a field (box for entering data) in Lightburn where I can enter “40” and I will get a circle with a 40 mm circumference?

In the size field you can input formulas.

Not near the pc to test, maybe if you type 2*pi/40.

That should be Circumference/Pi (without the 2* as well). LB doesn’t seem to support the “Pi” constant (AFAICT) so just type 40/3.1415926 in the Width or Height Box (making sure you have aspect ratio lock on first). You might not need Pi to 7 decimals so just round accordingly.

EDIT: Ok, after consulting the online docs I see that “pi” is the constant (as quoted in your post!), so 40/pi would be what you’d need to enter to get a circumference of 40mm.

LightBurn’s expressions support pi() as a function (which is admittedly a bit odd, but it’s how the library we use works).

So you can type

`40/pi()`

into the size field and it will give you the correct answer.

You don’t need the brackets btw.

Ahh - ok, it looked like it was a function, but I think it’s just that your original was capitalized, and the code is case sensitive.

You´re right, The size is the diameter and the correct formula circumference/Pi.

HELP! first time brain dead in the morning maybe I´m getting old officially or a lot of things happening in the BUS .

Early in the morning, you may have too much blood in your caffeine stream.

Very astute! Nicely done, amigo.