[Geo Girl]

I have the Fanuc Oi-Tc

G64 is not for Fanuc T-series. How can this be displayed?
Which control are you using?

[g-codeguy]

If you are not using G41/G42 and are using a .031 radius nose insert, then the program should be

X-.062Z0
G3X1.968Z-1.015R1.015

1.968/2+.031=1.015

Some controls alarm if the program dimensions aren't within set limits of being perfectly correct. Example Fagor or Seicos controls. I'm not familiar with your particular control, but have run OT and 18T controls. These will not alarm if the radius is programmed incorrectly. Instead the control makes what appears to be a circular motion until it reaches the programmed coordinates. However this does not explain why your OD is coming out wrong. You should still be getting the correct diameter, just not the shape you are looking for.

Please post back when you discover what the problem is.

EDIT: As sinha mentioned, there is no reference to a G64 in the Fanuc manual I have at home.

[HuFlungDung]

If you command a movement:
G00 X1.0
M0
G00 X-1.0
M0
Using a steel rule, how far do you measure the tool tip moving?

I'm still thinking that there is some sort of a scaling issue going on, as in the X parameters for that axis are set incorrectly.

Is this lathe new to your shop, and has been working correctly up til now, or what is the history?

[cogsman1]

You said your tool has a .0312" radius. Have you entered that into the "R" register?
Have you entered a 3 in the "P" vector register?
You never answered that.

[guru]

Try these codes, this is similar to what g-codeguy has but with lead-in and out just in case you want to use nose comp later.

1/32 R Insert No Comp.

G0 X-.0625 Z.1
G1 Z0 Fxxx
G3 X1.968 Z-1.0153 R1.0153
G1 X2.168
G0Z.5


If you use "CNMG type" insert you have to put "3" for direction of cut and may need negative sign in front of R (-.0312")

[sinha_nsit]

But he says that he is not using radius compensation.
Even without radius compensation, the error should not be too much.
However, I do suspect that his program does use radius compensation, with incorrect values for radius/tip direction.
He should post the complete program.

[littlerob]

Curious to know what happened with this, Geo Girl did you figure it out?

Robert

[georgette]

Hi gang,

This was my original post, I have a new log in name new computer. Anyways,
We just had 3 techs here from China trying to fix this problem believe it or not. The first day, they tried to program the radius (obviously thinking this was my programming error) but had no luck. Day 2 they tried entering new parameters into the machine ect.. they left after 2 days with no success.

They took the info back to china to try the same program on their machines in the factory. Don't know what they will do. I don't think it is fixable. Offered us a new machine at cost

Glad to say it was not my fault, but sorry to say its not fixed. Appreciate again all the help. I'll be back!