Try this on your sim 

T1M6
G54G90G0X0.0Y0.0S1500M3
G43H1Z2.0M8
G98G83Z-.75R.1F5.0Q.1
X-2.0
G80M5
G28G91Z0.0M9
M30

See how all the pecks go back to the initial plane(Z2.0)
Lets say there is something 1.5 in tall at X-1.0 that
you are jumping over.

The R is where pecks always come from the G98/G99 should
control the final retract

Now try this but dont look at the code just watch the sim

T1M6
G54G90G0X0.0Y0.0S1500M3
G43H1Z2.0M8
G0Z.1
G99G83Z-.75R.1F5.0Q.1
G80
G0Z2.0
X-2.0
Z.1
G99G83Z-.75R.1F5.0Q.1
G80M5
G28G91Z0.0M9
M30

The second one is how I am used to seeing G98 work
only it is G99 with added lines
I have this part with alot of ribs to jump over and
drill between the ribs and I had time to watch it
so now is the first time I noticed it

I wouldnt lose much sleep over this it is not that
big of a deal.


Terry









On Mon Nov  3 20:37 , Chris Radek <[EMAIL PROTECTED]> sent:

>On Mon, Nov 03, 2008 at 07:11:04PM -0700, Terry wrote:
>> 
>> When used with G83 it is rapiding from the initial plane
>> down to the R plane,drills one peck,then rapids back to initial plane
>> then back down and drills again,all the pecks return to the
>> initial plane.This wastes time and wear on the screw if there is many holes.
>
>I think you want G99 not G98?  Maybe?
>
>http://www.linuxcnc.org/docs/2.2/html/gcode_main.html#sub:G98,-G99:-Set
>
>> What I expected to happen was a rapid down to the R plane from the initial
>> plane only on the first peck.All other pecks for that hole should
>> return to the R plane.When that hole is complete then a return to
>> the initial plane then move to the next hole location.
>
>Do you think the spec is bad, or the behavior doesn't match the
>spec, or both?  It's clear as mud to me...
>
>


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