noob needs help

[chrispare]

im using mach3 and want to know how to compensate for a different size cutting bit,(say 5mm instead of 2)

i am using mach3 to import the dxf file and then creat gcode.
the dxf file is created for lasercutting and i want to use a cutting bit.

how do i do this??????????

[warrenb]

You will need to set up a tool offset using a G-code offset (g41 (left side offset) or g 42 (Right Side Offset)) then you simply use the tool offsets table in Mach 3 and assign the correct diameter.

So you can take your toolpath and you'll have a line that looks something like this.

g41 (left hand offset) d1 (tool 1 reference)

This is similar to the tool height offset. g43 (tool length offset negative) h1 (height of tool 1)

Now you have to make sure that you are cutting the correct direction so that you're on the correct side of the line and correct cutting method, climb cut or upcut.

I hope this helps. Here's a link for g-code definitions...

I don't make toolpaths with Mach3 but this is standard G-code programming.

Good Luck

http://en.wikipedia.org/wiki/G-code

[chrispare]

yes i created toolpath useing mach3.

[jalessi]

Have you defined your tools in the tool table?

[chrispare]

yes i have.
and i have tried and changed just about every number and anything that can be changed.
when i try it out it dosnt compensate for the bigger tool diameter.

[warrenb]

Originally Posted by chrispare yes i have. and i have tried and changed just about every number and anything that can be changed. when i try it out it dosnt compensate for the bigger tool diameter.

Send your g-code post and a screen shot of your tool table and I'm sure we here at cnczone can help you out.

[chrispare]

warren sent you a pm

[jalessi]

What about G42

[ger21]

You need to have a proper lead in move where the compensation is applied. POSt your code here so we can see it.

You can also use G41 P2.5 for a 5mm cutter.

[jalessi]

Tools are numbered from 0 to 255.
The tool number is selected by the
T word in a part program or
entering the number in the T DRO.
Its offsets are only applied if they
are switched On by the Tool Offset
On/Off toggle button (or the
equivalent G43 and G49 in the part
program)

[chrispare]

here is a couple pics of my setup ,
i hope you can see and be able to help

[ger21]

You can't just tell it the tool diameter and have it offset. You need to write proper g-code for using G41 or G42.