G82

[eliot15]

Hey, can you peck with a G82. I want to use the dwell (P) address for chamfering, but was wondering if I can use a Q address and peck too. I was under the impression that the G82 format doesn't include a Q address.

Thanks

[stevo1]

I do not believe that you can. What type of control are you using? Why would you want to peck on this cycle?? Why not just use G73 or G83?

Stevo

[eliot15]

Fanuc controls. I typically counter sink using G73, a slow speed of about S350, a slow feed of about F1.5, and small peck of about Q.015. Those are my go to parameters at the moment and they usually work fine with a sharp tool.

A guy at work was struggling getting a descent counter sink the other day, and some other guys were telling him to add a dwell of about P1000 or so, hence the G82 cycle. I was convinced his problems were related to his setup, but thats neither here nor there. Anyway, I made the point that you can't peck with a G82, and other folks thought you could.

So just for ghits and siggles, I added a Q address to a G82 cycle and ran it. It didn't alarm out and ran, but to be honest with you I couldn't tell if it was pecking or not. I sould have used a larger peck to experiment with, and overrode the feed to slow it down enough to seed, but didn't have time to mess with it.

So, the G82 cycle ran with a Q address, but I'm still not certain it pecked.

And there ya' have it.

[stevo1]

My guess would be that it did not peck. The G82 line will except the Q value without alarm but may not run it pecking. I do this in my macros all the time. I allow the operator to select the drill cycle that they want to use and in the macro line there is a Q value. If he uses a peck he can set the Q. If he chooses to not peck by using a G82 or 81 then he just sets Q0.

Stevo

[angelw]

Originally Posted by eliot15 So, the G82 cycle ran with a Q address, but I'm still not certain it pecked. And there ya' have it.

The Q is ignored. No matter what value you use, no peck will result.

Regards,

Bill

[Caprirs]

Probably the easiest way to accomplish this is to make a custom G code or macro. Start with the code for a G83 and add the dwell on the appropriate line. Or, if possible, edit the G83 to add the dwell.

[Geof]

Surely you could get the desired effect just by using a G83 followed by a G82.

[mfgbydesign]

Geoff beat me to it. Ditto.

[eliot15]

Yup. I was pretty darn sure watching the operation that I wasn't seeing any pecking going on. So, I have officially established to my own satifaction that G82 don't peck.

But Caprirs may have inadvertantly raised the flip side of my question. I'm thinking this is a typo:

Start with the code for a G83 and add the dwell on the appropriate line. Or, if possible, edit the G83 to add the dwell.

Because G73/G83 don't dwell, right?

[Caprirs]

Depends on who wrote the macro for G83 in your machine. Generally, G83 will not have a dwell.

[Geof]

Buy a Haas.

The picture is from a current Haas Mill Manual.

[eliot15]

Gotchya. Guess it all depends...