G74 VS G83?!?

[stuby]

Hello again. I am trying to do a peck drilling cycle in my Leadwell LTC-15 lathe, with a Fanuc-OT controller on it. I have it moving correctly for a G74, however, I want to have the tool retract to the initial start point, instead of my R value. Basically, I want to cut, rapid out my specified retract, then rapid to my initial point, which is outside my part, then rapid back in, and feed into the next cut. I believe this is G83? I have done this before in my milling machine, Im not sure of the lathe code though. I looked through my manual, and it doesnt give me any example codes for G83. I think it should be similar to the G74 format in regards to retract value, and depth of cut,etc but where do I put my initial point? Thanks for the help ahead of time, I think its an easy fix.

[dcoupar]

My guess is your control doesn't support G83 unless it's a 0T-C or 0T-D, but it's worth a try.

Position on center 0.1 away from the part, then:

G83 Z-1.5 R0 Q1500 F0.01

(R is incremental distance to rapid before feed)

Either it'll peck drill or you'll get an invalid G code alarm.

If it peck drills but doesn't back out to the clear plane between pecks, change parameter 031 bit 4 to 1 (0 is high-speed peck cycle).

Good luck.

[g-codeguy]

If Mr. Coupar's example doesn't work, then do you have Macro B option?

[stuby]

Thanks for the input, Ill give D's advice a try; quick question though. I input my G74 as a double line. I.E.

G74 R.1 <---Escape amount
G74 Z-1.5 Q1500 so on and so forth....

Do I do a double line also with G83? first R to specify escape, second R to specify rapid? Either way, Ill plug it all in and give it a shot. Im not sure about the macro options, Ive never tried that before. Thanks for the help, ill get back to you guys.

[g-codeguy]

No. Single line.

[stuby]

Hey guys, I just tried that out, and I keep getting alarm 010 - Unuseable G-Code. Does that mean my controller does not support it, or does it mean that I am missing or incorrectly inputting the info? This is what I tried...
Position .1 away from part on center then...

G83 Z-3.0 Q1500 R.1 F.010

I also tried a double line I.E.

G83 R.2
G83 Z-3.0 Q1500 R.1 F.010

But alas, I just realized...I wouldve been done by now if I did it out by hand. It tells me about G83 in my controllers manual, however it says it is invalid. Oh well, thanks for the efforts guys, maybe Ill get it another day!

[g-codeguy]

Yup, it means your control doesn't support G83. Using MDI input #100=1. Does it alarm when you hit cycle start? Or does it put 1.0 in #100 variable?