simple part program

[chevblue2]

Hey all
still new to cnc here
my ? is what g code can be used to increase z depth in a program for say a simple square without writing the 4 lines to outline the square an additional line for z(increase depth) and on and on
I am still writing programs the long way(theres gotta b a easier way.lol)
Thanks

[Geof]

Put the code that outlines the square in a subroutine and then have the Z depth set before calling the subroutine. Exactly how you do this may depend on your machine; I use Haas and this is how it would be done:

Say it is a 4" x 4" square, I would put the work zero at the center of the so the four corners are at; X-2. Y-2.; X-2. Y2.; X2. Y2.; x2. Y-2.

To go around this square five times taking a cut 0.1 deep the code would be something like this:

etc
G00 X-2. Y-2. Z0.
G91 G01 Z-0.1 M97 P1000 L5
G00 Z1.
etc
M30
N1000 G90 X2. Y-2.
X2. Y2.
X-2. Y2.
X-2. Y-2.
M99

This positions the tool at the corner of the square, increments down 0.1 and goes around the coordinates in the subroutine, returns back from the subroutine and increments down another 0.1 and back to the subroutine until it has taken five cuts. Notice each cut stops at the place it started.

Of course this simple code needs other stuff, you would need a pilot hole or have a ramping move and you need extra moves to clear out the center of the square but this is the basic idea.

Problem is some machines will not let you do an L count on a sub routined call.

[cyclestart]

Originally Posted by chevblue2 l I am still writing programs the long way(theres gotta b a easier way.lol)

If the "long way" means hand coding, I encourage you to develop this skill. It will pay dividends if you start into CAM. Maybe especially if you start into CAM. New users diving into CAM without the most basic g-code knowledge give me the willies.

In addition to using a sub there is the macro approach if your control handles it. Probably best to learn subs first. This site has some basic info
http://www.cncci.com/resources/tips/...om%20macro.htm

[chevblue2]

Thanks for the replies Guys!
I have been tryin to learn mastercam and also have a conversational (simplecnc) program.
Built a bench top mill with x18" y8" z7" in travel and runs on pc using kcam.
I understand what u mean cyclestart and will keep practicing but a shortcut once in a while would b nice.lol
Thanks for the example Geoff i'll give it a try