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Discussion Starter · #1 ·
As the title says I'm learning CNC.
Sainsmart 3018 prover with Y extension, CAD is Vectric desktop, CAM is GSender.
Sat quite awhile going through grbl controls, vectric tutorials and gcode. I've learned a lot but still haven't made my first cut.. if I don't count it taking off and slamming into my work piece.

My last issue is the gcode wants to start the job in the wrong place and wrong Z.
I have run homing, zero XY on the corner of the work piece, zero Z on the work piece making sure I press the zero for each axis. But it starts in the +Y about 1" away from where I set zero. It's a simple cut, 1.5"x5.6"x.05" piece of wood that I want to make a shallow cut the length of the wood. Nothing seems to work. I'm still trying different things slowly but I can't get it to do what I want.
Any suggestions would be appreciated. Thanks.
 

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Discussion Starter · #3 ·
The snowman is from the free download. I tried this one to see if it made any difference. Only thing I modified was the dimensions to 3.5" x 3.5". I found the post processor was set to 3018 prover XL and changed it to 3018 prover. It still tried to start in the wrong place.
This is the gcode. Not sure how to post the crv file.
Thank you for your help.
 

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The gcode shows that the cut will start at .9" in X and .4" in Y away from where you set XY0. If this is not what you want to happen, something is off in your CAM software or the post processor you are using. The .crv will show what the tool path should be and if it is not what you are getting, we can work from there. One thing that you may want to try it to set the post processor to grbl inch or grbl mm.
I don't know thet acceptable file types that can be uploaded here, but if .crv is not one of them, you may be able to zip it and upload that. Other than that, I am out of ideas. Sorry.
 

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Discussion Starter · #5 ·
The gcode shows that the cut will start at .9" in X and .4" in Y away from where you set XY0. If this is not what you want to happen, something is off in your CAM software or the post processor you are using. The .crv will show what the tool path should be and if it is not what you are getting, we can work from there. One thing that you may want to try it to set the post processor to grbl inch or grbl mm.
I don't know thet acceptable file types that can be uploaded here, but if .crv is not one of them, you may be able to zip it and upload that. Other than that, I am out of ideas. Sorry.
I think your right on the mark. I think I just selected post processor gcode (inch) and didn't look at the then where it says (.gcode).
I've gone back to my simple single line cut so I can look up the gcode values and see if that makes a difference.
Silly mistake on my part.
Thank you very much. I'll try it again in a few minutes and let you know.
 

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Discussion Starter · #6 ·
I think your right on the mark. I think I just selected post processor gcode (inch) and didn't look at the then where it says (.gcode).
I've gone back to my simple single line cut so I can look up the gcode values and see if that makes a difference.
Silly mistake on my part.
Thank you very much. I'll try it again in a few minutes and let you know.
I tried 3 different post processors using Grbl inch gcode, OpenBuilds grbl inches, and Vcarve inch gcode. All did the exact same thing.
I tried to set Z above the wood to see where it starts without slamming into the wood but after I run run the program the Z0 is -.160. I stopped the program before it went into the wood.
At this point I'm not sure what's going except I've set something up wrong.
I'm going to zip the crv file and send it in a few minutes.
Thanks
 

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Discussion Starter · #7 · (Edited by Moderator)
I tried 3 different post processors using Grbl inch gcode, OpenBuilds grbl inches, and Vcarve inch gcode. All did the exact same thing.
I tried to set Z above the wood to see where it starts without slamming into the wood but after I run run the program the Z0 is -.160. I stopped the program before it went into the wood.
At this point I'm not sure what's going except I've set something up wrong.
I'm going to zip the crv file and send it in a few minutes.
Thanks
Attachment does not accept .zip extensions.
Thanks for your help. I'll keep plugging away at it.
 

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Discussion Starter · #10 ·
Problems fixed thanks to everyone and especially gwilki.

One problem was a setting in GSender where I had the Y direction reversed. The manual for my cnc failed to mention this when using GSender. Even though the post processor was correct GSender assumes the gantry moves which mine it is fixed.
Another problem was in Vectric Desktop where the Z Gap above Material was set to 0.8 and I changed it to 0.2. Not sure if this is a setting for my cnc but it worked.

Now I can start testing other crv files and see if everything is OK.

Thanks everyone!
 
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