c axis explanation needed

[g30u0w0]

Ok,
I need help in regard to clarification of these codes- G112, G17, and M119 S... i run a Daewoo Puma 2000sy machine. Full c axis and y axis on main and sub spindle. I use mastercam to do all of my code. When I do something like engraving on the face of a part the code I get uses g17 before engraving and back to g18 at the end of the operation. Everything is fine. I never have seen a g112 post from my mastercam parts. What is the difference between g17 and g112? Are there applications where one is used and not the other? I am hoping someone can give me a brief description of c axis ops using these codes.
Also, how does m119 fit into the mix. I have never seen this one either. I understand you can position the spindle to a specific C axis rotation with this command. How is M119S0 different than just commanding G00C0.0? If I just call out C commands is that not the same as m119 positioning.
Everything I have used up to this point is either in g17,g18,or g19, and I am the only cnc person in my shop. Any help will be much appreciated.
TY,
Chris

[g-coder05]

g112 and 113 are polar interp commands. g17,18,19 are plane commands. the best i can remember daewoo uses g112.1 and g113.1 . I always call a C0. after G112.1 comes active since some post dont go back to the same spot after a tool change. as far as the m codes go i cant realy remember since there are 300+ on that machine and i dont have a book in front of me.

[dcoupar]

With your Puma SY you have a couple of choices when working on the face of the part with live tools.

1. X/C - contours are broken into little line segments.

2. X/Y - programmed just like a mill, except X is a diameter. Requires G17 (XY Plane) if you're going to use cutter comp and/or cut any arcs.

3. Polar - program like a mill except X is a diameter and you use C instead of Y. G12.1 turns on Polar Interpolation (G17 isn't required, IIRC). Cutter comp works in Polar Interpolation mode.

X/Y is probably the strongest (if the part fits within the X/Y envelope), because you can clamp the C-Axis and go to town. X/C or Polar Interpolation require C to be moving, so you can't use G89 (High Clamp).

M119 simply orients the spindle to the specified angle (S). IMHO, the best use for M119 would be for robotic load/unload applications, but others may have different ideas.

[g30u0w0]

dcoupar,
Ty for the info. I think I will stick with the way I have been doing it which is clamping and using X and Y axis as you said. I think you are right as far as the rigidity of this setup is concerned as long as you can fit within the y max travel. I appreciate your input. I was just getting a bit confused with people talking about g112 and I thought I was missing a piece of the big picture. I have had problems in the past with trying to use X and C where the C motion could not keep accurate enough in its feed, delivering out of tolerance parts. Especially when helical boring. I would get out of round holes using X/C and perfect ones using X/Y. Thanks again.
Chris

[g30u0w0]

dcoupar,
Forgot to ask.
Would it be save to assume the g112 is more applicable if the machine does not have y axis capabilities?
TY,
Chris

[dcoupar]

Yes. Polar Interpolation is about the ONLY way to manually program C-Axis face profiles. At least in a reasonable amount of time.