FACING PROBLEM IN PROGAMMING FOR A 3D MODEL

[kumar_manikonda]

i use unigraphics cam to program for 3d models. i have a problem using the program generated. whenever i use the program on a fanuc controller based machine, i find the tool moving with jerks and unusual feeds (devaiated from the original feeds given in the program) enevn though i give G08 G64 P1 FOR ADVANCED PREVIEW CONTROL COMMAND IN THE PROGRAM. PLEASE HELP ME HOW TO AVOID THIS PROBLEM.

[dcoupar]

First of all, the 21i-M manual says G08 P1 must be in a block by itself. You have a G64 in there, too. Don't know if this makes a difference or not. Try putting the G64 in a block before the G08.

What model Fanuc control?

Is the program stored in memory, or are you drip-feeding?

[sinha_nsit]

G64 is the default. So, it need not be explicitly programmed.

Why are you suspecting the machine? The output file from UNIGRAPHICS' post-processor may have problems. Check the program where you see unexpected behaviour.

[dcoupar]

Yes, G64 is the default. However, he may have programmed Tapping Mode prior... who knows? I just said it shouldn't be in the block with the G08 P1.

[tobyaxis]

Al-Nano tightens the machine movements in HSM. It might help. One point to be noted is that with different year and series Fanucs the G-Code to turn it on plus the format (some like a canned cycle) is different.

This one is for a Fanuc 0i-MC (2006)

Here is an example of G5.1 high speed machining.

G90G0G54G80G40G49 (G49 must be called before G5.1)
G5.1Q1R1 (G5.1 high speed, Q1 turn s it on, R = precision 1-10 (1 = least precise, 10 = most precise))
G43H1X0Y0Z1.0M3S500T2
machining cycle
G5.1 Q0 (TURN OF HIGH SPEED)
Z5.0
G91G30Z0