Lathe C axis accuracy

[GoetzInd]

I have been programming some X-Caxis paths on a new machine we have because it does not have enough Y axis travel to reach all the way around the profile. Control is a 18i and I'm using G12.1 cord. conversion and the machine is cutting smoothing but the profile accuracy isnt even close. Off maybe .020 in some areas. My question: is there a parameter that controls the accuracy of the the G12.1 function? I don't think I am feeding too fast. Only 50ipm. And I don't have this problem on other machines. Any thoughts about C axis profiling in general?

 

Thanks,

Mike

[Philcott]

The machine doesn't happen to be a Doosan Puma by any chance does it?

 

Our Mori cuts very accurate our puma does not.

[[email protected]]

C axis is dead nuts on our Mori also

[GoetzInd]

quote:

---

The machine doesn't happen to be a Doosan Puma by any chance does it?

---

Yep. The funny thing is our other doosan machines do not have this problem.

 

Mike

[Greg Williams]

quote:

---

Doosan Puma

---

That will be the problem

[Guest CNC Apps Guy 1]

quote:

---

quote:

---

--------------------------------------------------------------------------------

Doosan Puma

--------------------------------------------------------------------------------

---

That will be the problem

---

Affirmative.

 

quote:

---

I don't think I am feeding too fast. Only 50ipm

---

Depending on the diameter at which you are cutting and depending on the type of feature you are cutting that could very well be the problem sorry to say.

[Philcott]

We have two puma's and have to limit what we machine with the "C" axis. It's fine for drilling but cutting contours sucks.

 

We had two Daewoo service guys in and they spent a day and a half trying to dial it in to very little success. I hope yours will do better for you.

[Santa Fe]

We have a Mori and I allways have to modify the programs manually to come up with the right dimensions. But I have to say the parts we do are very small.

[latheguy1981]

I have a puma 240 and I have to slow my feed down to about 10ipm to contour anything on more than a 4in dia. A little better if you go smaller, but not much.

[Newbeeee™]

quote:

---

--------------------------------------------------------------------------------

The machine doesn't happen to be a Doosan Puma by any chance does it?

 

--------------------------------------------------------------------------------

 

Yep. The funny thing is our other doosan machines do not have this problem.

 

Mike

---

Mike,

Take a copy of the good machine and the bad machine parameters and run them through file compare?

1401 to 1790 are feed rate control parameters.

Then get the yellow books out...

HTH

[GoetzInd]

Sounds like a plan

 

quote:

---

Then get the yellow books out...

---

I hate those yellow books.

 

Mike