Peck Drilling

[DavidB]

At what stage do you go for Peck drilling (G83) over standard drilling (G81)?

Is it the deep that governs a peck cycle, material, or safty?

 

Say I want to drill a .250" x 1.5" deep would you peck drill or standard drill?

[Guest CNC Apps Guy 1]

Usually over 2.5x Dia. and I'm pecking, but that's just me and my preference.

[Greg Williams]

david,

 

Everybody will have a different answer for this one.

 

For me Through coolant drill G81

every thing else G83

[Bruce Caulley]

I don't really use a standard as such. I go by max chip evacuation for that particular application.

 

For a thru coolant drill you are only limited by the flute length if you have good chip evacuation, so G81 (simple drill for Heidi users)for most.

 

If you have good chip evacuation but no thru coolant G73 (chip break cyc 203?)is the go.

 

For poor chip evacuation use G83 (cycle 200).

 

Most good drills should do 3xD before a peck is needed, no matter what the conditions.

 

HTH

 

Bruce

[DavidB]

Ok so once you've decide to peck say over 3xD what peck do you use.

I was told 1xD for peck depth?

[Bruce Caulley]

1xD is a good place to start, but at the end of the day chip evacuation will determine the peck limit.

 

Bruce

[Guest]

quote:

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Usually over 2.5x Dia. and I'm pecking, but that's just me and my preference

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I'd love to be able to achieve this, we use for the vast majority of our drilling, Guhring Series 552 drills.

 

If I send out a peck at even 1 x D, it gets knocked back to 50-60%. Aggravating, because I know they cut better then they are given the chance.

 

Should have seen the looks on their faces when I G81'd at 30IPM right thru a 303 SST part with a masterdrill. Couple of jaws had to be helped up.