milling an elipse

[gallzer]

Hi guys,

Recently i've have to mill different sizes of eliptical holes, does anyone have a program, in heidenhain preferably, that only involves altering the length and width of the elipse. It would save me a bit of time and hassle loading from a computer into the machine each time!

Thanks for any help.

[High Seas]

One of the members has shared a small program to do something similar.
Sorry don't recall the member or the specific title - but it was a followup in a thread, "Milling a Sphere", I believe - -- Hope that helps.
Jim

[samco]

I don't know if this will help... This is written for emc2

http://wiki.linuxcnc.org/cgi-bin/emc...Sample_ellipse

sam

[Andre' B]

Some simple macro B stuff.
Remove the #104 line and the G68 and G69 lines if your control dones not do rotation.

G0X0Y0

#100=0.5(X RADIUS)
#101=2.0(Y RADIUS)
#102=1(ANGLE STEP)
#104=15.0(ROTATE PATTERN)
(****************)
#103=-1(COUNTER)
G68X0Y0R#104
G1G41X[#100*COS[#103]] Y[#101*SIN[#103]] D1 F10.0
WHILE [#103 LE 360] DO1
G1X[#100*COS[#103]] Y[#101*SIN[#103]] F10.0
#103=#103+#102
END1
G1G40X0Y0
G69

[Kiwi]

Originally Posted by High Seas One of the members has shared a small program to do something similar. Sorry don't recall the member or the specific title - but it was a followup in a thread, "Milling a Sphere", I believe - -- Hope that helps. Jim

Try this
http://www.cnczone.com/forums/showth...719#post411719

[Kiwi]

gallzer
I've altered the Ellipse program to produce Heidenhain code.
As I don't know this language, please check, and advise errors.

[High Seas]

Kiwi - I am still looking to mill a rugby ball! Any luck on that code? Thanks for popping in - I forgot that you were the guy!
How could I do THAT?! Pretty ordinary - eh?
Jim

[Kiwi]

Jim
I posted the program for a ellipsoid to the other thread just a few days ago.
http://www.cnczone.com/forums/showth...719#post411719
You are slipping in your old age ;-)

[GrantM]

Quick way is to simply set the axis scaling (assuming you have that feature) of one axis to 200% and do a circle (G2/G3) - instant elipse!

Only problem with this is the cutter radius. If it's very fine cutter and/or you don't need absolute perfect accuracy, then it may not be a problem. CRC generally will stuff up when done like this, so if you use this method, probably best to use fine cutter and leave CRC off.

[gallzer]

thanks for all the replies guys i'll have a go at andre bs program, but hopefully altering it to heidenhain. Kiwi your generator is great but i'd prefer to use the same program only having to alter the x and y dinensions.

[High Seas]

Kiwi -- Thanks - Must be the thin air up here on the Hard Stand!
Jim
oops get a 404 - not found - I'll go looking - cheers

[Kiwi]

Jim...I get the same 404. The one in #5 is the same but does work.