"Decremental" Peck Drilling

Bob La Londe · Dec 5, 2019

Is there a G-code that supports decremental (3x, 2x, 1x, 1x, 1x... diameter) peck drilling or is that a machine specific function?

SeymourDumore · Dec 5, 2019

IF!!! your control supports it, you can write a G83 cycle using I J K instead of Q.

I : First peck depth
J: Amount to reduce successive peck depths
K: Minimum peck depth

So, let's say you write:
G83 Z-2. I.2 J.04 K.1 F1.
Then:
1st peck is .2 deep
2nd peck is .16 deep
3rd peck is .12 deep
4th and all successive pecks are .1 deep ea.

Bob La Londe · Dec 5, 2019

SeymourDumore said:
IF!!! your control supports it, you can write a G83 cycle using I J K instead of Q.

I : First peck depth
J: Amount to reduce successive peck depths
K: Minimum peck depth

So, let's say you write:
G83 Z-2. I.2 J.04 K.1 F1.
Then:
1st peck is .2 deep
2nd peck is .16 deep
3rd peck is .12 deep
4th and all successive pecks are .1 deep ea.

THANK YOU!

I'll give it a try in simulation and see what happens. I have a sandbox installation for one of my control programs on my design computer. The other one I'll just have to try on the machine. (cutting air of course)

Just did a quick test. Looks like my sandboxed control doesn't support it. It didn't fail. It pecked to depth at K. Oh, well. Anyway. Thanks again for that information. It may come in handy some day for me. I will try it on the other control when the machine is free.

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"Decremental" Peck Drilling

Bob La Londe

Aluminum

SeymourDumore

Diamond

Bob La Londe

Aluminum

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