[bcer960]

I am trying to carve a picture and would like to make the first couple of passes .03 higher than is programed so the bit isn't digging in full depth with the full width of the cutter. I have been doing this manually by setting "all zero" on my part, then re-setting the "Z" -.03. Cutting the frist couple of passes, then re-stiing the "Z" back to 0.0.

I had hoped there was a way to do this in the code. I looked up and found G 92. I tried using this, but could not get it to move the "Z" height as predicted. In my research I found out about G 52, that is supposed to replace G 92. However, this when using this I couldn't make it work as well.

Here's my code


( Mach2/3 Postprocessor )
N20G00G21G17G90G40G49G80
N30G70
N40T2M06
N50G00G43Z0.0600H2
N60S16000M03
N70G94
N80X0.0000Y0.0000Z0.0600F100.0

N81G52X0.00Y0.00Z0.09 I added in here move "z" up .03


N90G00X2.0337Y-2.8707Z0.0600
N100G01Z-0.0231F100.0
N110Y-2.8610Z-0.0224
N120Y-2.8319Z-0.0201
N130Y-2.8223Z-0.0231
N140Y-2.8029Z-0.0217
N150Y-2.7350Z-0.0238
N160Y-2.6624Z-0.0210
N170Y-2.6188Z-0.0216
N180Y-2.5897Z-0.0194
N190Y-2.5364Z-0.0191
N200Y-2.5122Z-0.0145
N210Y-2.4928Z-0.0172
N215Z0.0600
N216G00X2.0337Y-2.8707Z0.0600 after 3 passes I return to the original co-ordinants

N217G52X2.0337Y-2.8707Z0.0300 insert the G52 to return to "Z" back to original height




N90G00X2.0337Y-2.8707Z0.0600 and start the program over
N100G01Z-0.0231F100.0
N110Y-2.8610Z-0.0224
N120Y-2.8319Z-0.0201
N130Y-2.8223Z-0.0231
N140Y-2.8029Z-0.0217
N150Y-2.7350Z-0.0238
N160Y-2.6624Z-0.0210
N170Y-2.6188Z-0.0216
N180Y-2.5897Z-0.0194
N190Y-2.5364Z-0.0191
N200Y-2.5122Z-0.0145
N210Y-2.4928Z-0.0172
N220Y-2.4686Z-0.0191

But Is this the correct way? Because I cannot get the first height to lift .03, nor get it to return.

Any help is very much appreciated.

Thanks
Ray

[Geof]

I work with commercial CNC machines not Mach 3 but if Mach 3 interprets a G52 command in the normal manner you should be able to have a G52 command move any axis you want in any direction. Actually what it does is add a value into the work coordinate calculation in the machine processor.

G52 Z0.5 has the effect that the Z work zero location is moved (positive) 0.5

G52 Z0.0 means the Z work zero is not altered.

G52 Z-0.5 has the effect that the work zero is location is moved -0.5

I am puzzled because you write:

N81G52X0.00Y0.00Z0.09 I added in here move "z" up .03

When this command would move Z up 0.09

Similarly you have:

N217G52X2.0337Y-2.8707Z0.0300 insert the G52 to return to "Z" back to original height

This will move Z 0.03 and will also move X and Y

With G52 you should be able to set up your code and have the first run through preceded by G52 Z0.03 then repeat it after the command G52 Z0.0, like this:

G52 Z0.030
your code
G52 Z0.0
your code.

[bcer960]

thanks I will try that tomorrow

Ray