miyano fanuc 18i controlleer

[terrywinstr]

I have made several attempts to do rigid tapping with
this cnc lathe using the live tooling mounted on the turrent.
the manual says to use a g88, at this point i am wonddering if this
needs to be an option when purchasing the machine? also i would like a sample program for the g76 feature in id roughing, i had it working once but i cant get the program to work again, please some one help me with this before i go bald.
email me with any info. tks

[muddobber76]

I'll try to help ya out. The 18i is one of my favorite controls. I don't have alot of time at the moment but I can help out alot more on Monday if you still are having trouble.*Try using G71 for longitudinal roughing. A simple example for turning a 1.000" dia. shaft to a length of 2.000" from a piece of 3.000' dia. bar stock would be as follows.



Reference home
Call tool & offset
Blaa Blaa Blaa
G00X3.000Z.100
G71U.050R.025*************************** u=depth of cut* r=retract amount
G71P101Q103U.010W.002F.014***** p=start block q=end block
N101G01X1.000*************************** u=x finish allowance
G01Z-2.000 w=z finish allowance
N103X3.000


For ID bore it would be the same except finish allowance in x would be addressed as a negative....u-.010




*Rigid tapping is standard on an 18i control I am sure that your machine will support it. Fanuc uses M29 most of the time, but this could be different.*Try a one single rigid tap hole first to work out the proper sequence.Again I can help on Monday and we can get it worked out.

[hrh]

FANUC 18i requires option activation for rigid tapping.
Do a dummy operation with the main spindle using G84.
Also check parameter 5210. This is usually set to "29" if M29 is used to set the spindle in servo mode for rigid tapping.
Before rigid tapping is commanded, it is recommended to program M29 Sxxxx (xxxx = speed value) preceeding the G84 / G88 block. This only applies if parameter 5210 = 29.
Also check parameter 5212 (used if a M-code larger than M255 is used)

What year is the control manufactured? FANUC Controls manufactured after June 2006 can only be modified for options by FANUC.

[CNCBEN]

YOU CAN CHEAT...USE REALLY LOW RPM (SPINDLE);
GIVE -Z DEPTH AT FEED OF THREAD PITCH;
SPINDLE STOP (M5);
PROGRAM; __M3 OR M4 DEPENDING ON THREAD ROTATION - SAME RPM - POSITIVE +Z AT FEED OF THREAD PITCH__;ALL ON SAME BLOCK.
SHOULD WORK WITH RIGID HOLDER W/ RADIAL BACKLASH

1/2-20 RIGID TAP;
M3 S100;
G0 Z.1;
X0;
G1 Z-1.0 F.05;
M5;
M4 S100 G1 Z.1 F.05;

[JScharp 7675]

I need help programming a FANUC 21 in live tooling with the rigid tap cycle.