Quick backround... been running, setting-up and milded programing for cnc lathes for around 8-9 years in a production shop. A week ago i was tossed on a TOYODA FA550-II Horizontal Machining Center. Aside from simple stuff on a Bridgeport and Milling slots and bolt-hole pattens on a HITACHI-SEIKI HI-CELL 23 i have just about no Mill experience.
So my question is
How would you go about writing a "ramp on" path to face a 7.5in flange with a 3.5in bore through it.
Heres how they have it set up now but its creating a crap finish.
The finish only has to fall between 93-125 but can not have any draw or ramping marks on it.
Z.0 = finish depth.
X.0 = center line of flange
Y6. = clear rapid point above part.
Using a 4" face mill (EDIT: miss-labled as fly cutter before, sorry) with six inserts on Gray Cast Iron.
Orginal code...
Code:
G0 Y5.5 X-3.25 S600
Z.25
G1 Z.0 F25.5
Y.0 F30. (feed onto part)
G3 X-3.25 Y0. I3.25 J0. F30. (rough)
G3 X-3.25 Y0. I3.25 J0. F30. S1000 (spring pass)
G0 Z.75
G53 ....
Heres how i butched it to get a pretty good finish.
Code:
G0 Y5.5 X-3.25 S600
Z.25
G1 Z.005 F15.
Y.0 F30. (dont like this, want to ramp on with a G3)
G3 X-3.25 Y0. I3.25 J0. (rough)
G0 X-5.75 Z.032 (dont like all this eather, want to ramp off)
G1 Z0. S1750 F47.5
X-3.25
G3 X-3.25 Y0. I3.25 J0. (finish)
G1 X-3. Y-1.5 Z.001 (dont like this, want to ramp off cleanly)
G0 Z.75
G53 ....
I was trying to ramp on the part but keept gettin an alarm abuot radios is wrong, think it said it was too big or somthing...
Code:
G0 X.0 Y6. Z.25 S600 (rapid above and to center line of flange)
G1 Z.005
G3 X-3.25 Y.0 I.0 J-6. F30. (Ramp on but get an ALARM)
G3 X-3.25 Y0. I3.25 J0. (rough)
I dont have a full understanding of the J, I and K values for a G3 right now which seams to be my problem.
Think i see when your making a full circle X goes with I and Y goes with J and ill guess Z goes with K but im lost with partial circle.
Guess my bottom line question is how do you make a partial circle with a G3 to ramp on and off a part ?
Thanks for any help or advice.
- joe
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