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Using Peck Cycle is often needed when drilling deep holes.
When using proper feed and speed no peck is required at depths of up to 3xDia for regular or 5xDia for High-Performance Parabolic drills.
At depths up to 10x, up to 5 pecks are required for regular  drills and up to 3 for Parabolic.
Anything over 10x Dia requires constant pecking of 0.5-1x Dia for regular drills and 1.5-2 Dia for Parabolic.

Since for programming you need a peck amount. Here are the numbers:

Code:REGULAR JOBBER DRILLS
3x: No Peck
3x-10x: 1xDia Peck
over 10x:.75xDia Peck
over 15x:.5xDia Peck 
 

Code:HI-HELIX HP DRILLS
5x: No Peck
5x-10x: 2xDia Peck
over 10x: 1.5xDia Peck 

Of course our HSMAdvisor Speed and Feed Calculator suggests not only the Speeds and Feeds but also the proper peck depth for various drill types and depths of the hole.
It in fact was the first machinist calculator to do so. This feature was much later borrowed by our competition.

And here is a pretty image showing Peck VS Hole Depth for regular twist drill:

This not only means that peck amount should be different for different styles of drills and depths of holes.
But also that peck distance should be different for different stages of drilling the same hole.
Ideally we should start the hole with large pecks, that continually reduce as the hole gets deeper and deeper.

Let's find out how we can apply this knowledge when programming our toolpaths.
This is format for normal Pecking:

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As part of FS Wizard's development. 2 drills were tested today on T6061 Aluminum.

0.312 Dia and 0.390 Dia Dormer A002 Drill Jobber Drill with TiN coated tip.

Helix:30Deg

Point:Split, 118Deg.

Hole depth for both was 3.0"".

Peck equaled 1xDia

Speeds and Feeds for 0.312 Dia drill were

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Tool:0.281 dia 0 helix TIN coated carbide drill

Peck:0.125

Coolant: Air

RESULT
SFM: 49 f/min
RPM: 663
APT:  0.00070 in/rev
Feed: 0.93 in/min
MRR: 0.1 in^3/min
HP: 0.2
Torque: 19.4 in-lb
Max Torque: 22.9 in-lb

 

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Drilling Hardox steel Rc 45-50

January 26, 2011, 10:16 pm

Lately we've been doing alot of anvils out of 3/8 or 1/2" Hardox steel (Rc 45-50)
Aside from having to machine profiles and pockets we also have to drill some mounting holes.

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