Machsupport Forum

G-Code, CAD, and CAM => G-Code, CAD, and CAM discussions => Topic started by: Keith on June 12, 2006, 09:23:01 PM

Title: Peck Drilling
Post by: Keith on June 12, 2006, 09:23:01 PM
Hi,could someone walk me through how to code for peck drilling please.-Keith
Title: Re: Peck Drilling
Post by: Graham Waterworth on June 13, 2006, 04:12:13 AM
Hi Kieth,

Peck drilling cycle works like this :-

Short retract type, just breaks the chip, drill stays down the hole.

G73 Z-1. R.1 Q.1 F3.

Z = final depth of hole
R= safe starting distance above job
Q= depth of each peck
F= feed rate

or

Full retract type, every peck the drill moves back to start position (R) and then rapids back to cutting depth.

G83 Z-1. R.1 Q.1 F3.

Z = final depth of hole
R= safe starting distance above job
Q= depth of each peck
F= feed rate

If you add a G98 to the line it forces the tool to rapid back the the safe start point.

If you add a G99 to the line it forces the tool to rapid back to the R point. You should then put a G98 on the last move 

If you have 4 holes to drill on 1" centers you would do something like :-

N1 (DRILL 1/4" * 2" DEEP)
G54 G00 G90 G43 X0 Y0 Z25. H1 S1000 M3
G73 G99 Z-2. R.1 Q.25 F2.
X-1.
X-2.
X-3. G98
G80
G91 G28 Z0
M30

Graham.
Title: Re: Peck Drilling
Post by: Keith on June 13, 2006, 10:22:54 AM
Awesome,thanks Graham.Totally got it.-Keith