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Help with a peck drilling cycle
« on: November 27, 2015, 02:51:01 PM »
Hi all

The following code is of a bolt hole circle with a spot drill and the the peck drilling.
The Problem I am encountering is .......on the spot drill cycle all is fine rapid retracting and rapids between points.

On the peck drill cycle the rapids between the holes are not there? ??? ???  It feeds at normal feed speed.

Is there a problem with the code?

( 10. SPOT DRILL TOOL - 3 DIA. OFF. - 3 LEN. - 3 DIA. - 10.)
(10MM SPOT DRILL CYCLE)
N1726T3
N1728G0G90G55X33.Y0.A90.S1145M3
N1730G43H3Z2.
N1732G99G81Z-1.5R2.F114.5
N1734A0.
N1736A-90.
N1738A-180.
N1740X40.A-270.
N1742G80
N1744M5
N1746G91G28Z0.
N1748G28X0.Y0.A0.
N1750M01
( 5. DRILL TOOL - 2 DIA. OFF. - 2 LEN. - 2 DIA. - 5.)
(5MM DRILL PECK CYCLE)
N1752T2
N1754G0G90G56X33.Y0.A90.S1145M3
N1756G43H2Z2.
N1758G99G83Z-6.R2.Q2.F68.7
N1760A0.
N1762A-90.
N1764A-180.
N1766G80
N1768M5
N1770G91G28Z0.
N1772G28X0.Y0.A0.

Any help will be appreciated.
Thanks in advance.
Deon
If A is a success in life, then A equals X plus Y plus Z.
                               Work is X: Y is play and Z is keeping
                                                             your mouth shut.

Offline BR549

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Re: Help with a peck drilling cycle
« Reply #1 on: November 28, 2015, 08:48:52 AM »
Deon your code is good but the G83 is bad (;-)

(;-) TP
Re: Help with a peck drilling cycle
« Reply #2 on: November 28, 2015, 09:24:52 AM »
Hi

I cannot see how the G83 can affect the rapids between points????
the peck drilling is fine , its only the move between points that is at normal feed speed instead of rapids.

I will keep on digging thou, seems I am missing something small.

Thanks for the reply anyway.

Deon
If A is a success in life, then A equals X plus Y plus Z.
                               Work is X: Y is play and Z is keeping
                                                             your mouth shut.
Re: Help with a peck drilling cycle
« Reply #3 on: November 28, 2015, 09:45:23 AM »
Found this explanation by Graham about peck drilling.........

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


The only thing I see different between his and my code is the G98 on the last cycle and the G99 after the G73/G83 instead of in front like my post-processor's out put.
Will give it a go and see the result.

Thanks
If A is a success in life, then A equals X plus Y plus Z.
                               Work is X: Y is play and Z is keeping
                                                             your mouth shut.

Offline BR549

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Re: Help with a peck drilling cycle
« Reply #4 on: November 28, 2015, 01:37:38 PM »
The problem lies INSIDE the G83 code it does a feed move instead of a Rapid move to the next point. Change the G83 to a G81 and it will do a rapid between holes. I did not check the G73.

(;-) TP