Why is G98 G99 not consistant?

[1320feet]

I get G99 most of the time. I do however get G98 about 15% of the time. I have attached two screen shots of the parameters page from two different drills.

[JParis]

How many points in each cycle?

[Kyle F]

odd. at least with my posts, both of those would spit out G99 with "use clearance only at start and end of operation" checkbox selected while using clearance + retract

[1320feet]

5 hours ago, JParis said:

How many points in each cycle?

The G98 has one point and the G99 has four.

[Jayson Kramer]

16 minutes ago, 1320feet said:

The G98 has one point and the G99 has four.

So the 4 are at different depths at the top or the same? were the return plane for the one pint is one hight.

[crazy^millman]

What version of Mastercam? What post?

[1320feet]

3 hours ago, Jayson Kramer said:

So the 4 are at different depths at the top or the same? were the return plane for the one pint is one hight.

Yes, all 4 are the same.

2 hours ago, crazy^millman said:

What version of Mastercam? What post?

X5 and Generic Fanuc 4X Mill.

[crazy^millman]

Well 2021 is far back as I go so one of those going to have to deal with it situations.

[Aaron Eberhard]

On a normal Fanuc a g98 is return to initial plane after drilling the hole.  G99 is return to the R value.

 

In your g98, you've only got one hole, and it has to return to the clearance position afterwards due to your settings, so it's going to choose to output the drill cycle that returns to your initial plane.

In your g99, after starting at your clearance position, it's returning to a different height (R (retract) plane), so it'll have to output g99.

 

That's my guess, anyway

[1320feet]

I get it now, thanks.