840D mill an ellipse

[Akay90]

Dear community
I have a problem with the 840D controller. I don’t know how to program an ellipse/ oval.
I have a component part in which I have to mill a pocket in an oval shape. Unfortunately, I can’t create a suitable contour...
Is there also another possibility to create an ellipse- without using several pitch circles that form the ellipse?

Please help me- it’s pretty urgent!

Regards
Akay90

[Hugge]

Hello Akay90

Here is an example program:
ASCALE Y 2.0 ;Scaling Y axis a factor 2, 1mm then the programmed traverse paths are 2mm
N80 G0 X0 Y0 Z2 M107

; simply program a 30 circle
N10 G0 X0 Y0 Z2
N40 G1 Z-5
N45 G1 X-15 Y0
N50 G3 X15 Y0 CR=15
N55 G3 X-15 Y0 CR=15
N60 G1 X0 Z0
N65 G0 Z5

SCALE ; scaling deselection

give you an Oval of 30mm in X and 60mm in Y
It’s actually pretty simply. I hope it helped you out!


Kind regards
Hugge