Help with gcode

[MitchWillard]

Looking for some help with generating a couple lines of gcode for using my keyhole bit.

I was able to jog the machine to get a few keyhole slots cut but I’d like to have some actual gcode so the bit moves at like 40/in min, instead of the default jog speed which is real fast and adrupt for cutting.

I need something that will move the z axis down say… .35" / y axis forward .5" / y axis back .5" / z axis up .35" , at that 40/in per min

Any help would be appreciated.

[AllenMassey]

This thread has it

Keyhole Slot G Code

Don’t know if this will be helpful, but I searched all over for a way to cut t-hole slots for hanging pictures and frames. It needs to plunge to a quarter of an inch, and then nibble forward, back up, nibble forward, back up, etc. This is if you don’t want the hassle of first cutting a quarter inch pocket, then following up with the keyhole bit. This code is for 1/8" depth of cut slot cutters. The bottom of the cut is only .25" deep so this is safe for .5" material. This code slows the plun…

[ErikJenkins]

G17
G20
G91
S12000 M3
G1 Z -0.35 F40
G1 Y 0.5
G1 Y -0.5
G1 Z 0.35
M5
M2

This does what you asked…turns on spindle…cuts…and turns off spindle

[ErikJenkins]

Always test above the work (air cut) to make sure it does what you want. The code does what you asked, but look at what Allen linked…

[MitchWillard]

Could you explain the lines of code so I could get a better understanding?

[ErikJenkins]

G17 - default XY plane
G20 - inches
G91 - relative position
S12000 M3 - spindle 12k rpm M3 - spindle on
G1 - linear move at F40 - 40 inches per minute
M5 - spindle off
M2 - end

This example requires you to position the bit directly over the start position of the slot…again, check out Allen’s link above to cleanly cut a slot. This example will just plow through for half an inch…the link above will nibble the wood.

[WillAdams]

G-code is pretty straight-forward. Page on it here: Shapeoko CNC Router, Rigid, Accurate, Reliable, and Affordable