[Zeph1986]

Hello, Anybody got some Ideas on this?

I am having trouble programming a .250" offset 1.5" +-.006 Dia on 2" OD, on our just purchase Doosan Lynx 2100LYA. Getting .07" out of round. I am trying to do this with a vertical 1/2 endmill with a R.03.
The E-Z I software on the control wants me to do it as a live tool face, but with the tail stock and clamping less than 3/8" deep on a hex and my offest diameter starts at -1.625 and finishes at -2.875" , it rules that out as a possibility.

The strange part is I use a 1/2 Ballnose endmill and i am getting .030" out of round, I tried using a 1/4" 90 degree point endmill and its only out .002" Tried a CMNG insert and turning it, comes out perfectly round too, but taking out all that material, I am only pushing 1/8" DOC and .005 stepover, I am pushing the head as fast as it rotates but it takes a lot of time, as I am doing a lot of these pieces.
I also tried mucking about changing the rad in the program but if I increase or decrease it, I get some pretty cool egg shaped designs.
It's like I almost have to program some kind of tip comp in.

Also included a pic of what I am trying


I got a program off this forums and modified the diameters.

O1338(OFFSET MILL)
G54 G40 G00 X13.6 Y0 Z10.0
G00 T020 2M03
G97 S2600 P12 M35
G00C0
M8
X2.1 Z0.25
G50 C0.
G1 G98 X2.0 Z0.0 C0.0F20.
G112
M98 P1337 L125
G113
G0X4.Z2.M9
G40G00 X13.6 Y0 Z10.0 T0000
M05 P12
M30

Sub Program 1337
O1337
G2X-1.0 C0. R0.75 W-0.01 F20.
X2.0 C0.0 R0.75 F20.
M99

Thanks for any input, as I am new to programming lathes, and my company decided I'll be the one they throw in head first to learn it.