Fanuc 18iTB G84 will not reverse.

[positiverake]

This is on a okuma howa lathe with Fanuc 18iTB the G84 will feed in but then just sits there and will not reveres out? any help would be great. Thanks

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[Superman]

Post the actual NC code that you used...
Might be the code needs a little tweak, someting on the G84 line.
Ie G97Sxxxx, G98/99, maybe the machine doesn't have the tapping option... check this first

[positiverake]

Thanks for the reply. heres the code

G0T0909
G50S2500M8
G97S300M3
G57
X0Z.15
G99
G84Z-.5R0F.037
G80
G0Z6.M9
M1

[Superman]

Thanks for the reply. heres the code

G0T0909
G50S2500M8
G97S300M3
G57
X0Z.15
G99
G84Z-.5R0F.037
G80
G0Z6.M9
M1

I'm going to put ideas up that you need to verify from the programming book
... G57 ( lathes normally only need none (or one) programing origin, it may be hanging on this) (omit it to test)
... R0 ( retract plane may not be allowed ? Try omitting the R0 )
... F0.037 ( query, what imperial thread is 27 tpi ? )(¼" grease nipple?)

If you single step your program, your machine will stop processing code on the offending line. The run buffer could read 4 (or more) lines ahead.

Cannot see anything else that could be an issue
Other than G84 is not a function on your machine.

[positiverake]

Superman, G57 works fine, use G54-G59 all the time, I do both ends of a part a lot. Tried dumping the R did not help and yes the feed is for a 1/8-27 NPT , I have all the hole making cycles G83 etc. well thank you for your effort.

[Heavy_Metal]

Few questions, I assume you want to tap on X0. centre line with the main spindle !!!
Did G84 work before, .... can you do it with a live tool (G184) ??
If nothing works you can use a ER collet with axial compensation.
E.g. the Fahrion CET32-GB has a ± 10mm ( ½" ) compensation, you can use the spindle stop M5 and reverse with M4.
You have to drill a bit deeper than tapping because the rpm of the chuck creates a bit extra Z-value before the chuck stops.
They are available in sizes ER11 to ER40 collets.

[positiverake]

Heavy, you assumed rite just like the program shows, this machine does not have live tools just a plain 2 axis lathe. and yes I am tapping with a sponge holder and a G32 and that works, I was trying to find out why the G84 does not work, this is a new to me machine so I don't know if this cycle ever worked. it just seems weird that it will do half the cycle (tap in) but will not reverse out ? and no I'm not trying to Rigid tap. it must be waiting for a signal or something, I don't know? thanks' for the reply

[Heavy_Metal]

Okay, it's possible it doesn't work.
I had a double spindle - double turret with Fanuc 18i-TB and the G84 didn't work on the spindle (centre-line), I had to use the G184 with live tooling.
In the 18i-TB manual there's a G84, probably the machine builder didn't activate it, or probably not set by an "option parameter" .
We still have a 2 axis Fanuc-0T lathe and on centre-line I use these Fahrion ER-collets with axial compensation, it works fine.

[positiverake]

Heavy, thanks' for the reply, yeah I looked at "that parameter" and it's on and like I said the G83 etc. works so I don't know what it is. anyway I'm making parts with the G32 (maybe I'll make a macro and call it G84 so I can sleep at night) If I ever find out what it is I will post It. thanks