in calculating the tool path

[Grumpy Mike]

Thanks irving, I worked out what I needed this morning on the drive in to work and I agree with you. I just got the sin and cos swapped over but that don't matter it just rotates it through 90 degrees.
It's good to have confirmation before I try and code it. I am using the free language called Processing, it runs on all platforms.

Do you think there would be any interest if I posted the final result? I am also working on a program to send a G code file to the miller. I wanted to use Replicator G but I can't get that to work reliably on my Mac, despite several email exchanges with the authors.

[irving2008]

Thanks irving, I worked out what I needed this morning on the drive in to work and I agree with you. I just got the sin and cos swapped over but that don't matter it just rotates it through 90 degrees.
It's good to have confirmation before I try and code it. I am using the free language called Processing, it runs on all platforms.

Do you think there would be any interest if I posted the final result? I am also working on a program to send a G code file to the miller. I wanted to use Replicator G but I can't get that to work reliably on my Mac, despite several email exchanges with the authors.

Always interesting to see other people solutions to problems...

[Grumpy Mike]

Thanks routercnc, that is in essence what the solution posted by irving actually is, only the equations have been bashed about already to give the solution. The only difference being that instead of using:-
The equation for a circle (x^2 + y^2 = r^2)
then you use the parametric equation for a circle of :-
x = r SIN(theta)
y = r COS(theta)

[Wobblybootie]

Well, my contribution to this thread will be about as much use as tits on a kipper.

Reading it has seriously damaged my belief that I will ever master the maths involved in rudimentary CNC :sad:. I am beginning to think I should have listened to my old teacher instead of getting stuck into some practical human biology!!

Panic stricken in darkest Dorset!!