Machine goes wild in z direction

I know I have had issues in the past with this but I don’t think I ever saw a diffinitive answer. I ran a test piece on my longmill using the latest gSender and it cut fine. I put my production piece in an left x any alone but rezeroed z. When I started it up instead of cutting .02 deep it was going more than .25 deep. It happened on another run too. Any solutions?

@Wascally I’ve moved your question from the Bug category. I’m not sure that this is even a gSender issue, but with more information, I may be better able to determine that.

  1. Was the production material the same thickness as the test material?
  2. How did you reset the Z0 - on the surface of the material or the surface of your spoilboard?

The test piece was 3/4” and the prod piece was 9/16”. I put the piece in the machine in the same x-y position as the test piece. I then manually moved the bit to the zero x and zero y position and brought the bit down to the surface and hit the zero z button. I did it without the touch plate. So at this point it is using the original x and y zero and I have a new zero for z.. Since the stock was thinner than the test piece if it kept the original z it would not have touch the new surface.

@Wascally Post your gcode

Sorry this took so long to get back to the forum. Here is my gcode. It did not change between the test piece and the prod run.

D Nichter bottom side of lid.gcode (71.2 KB)

I just had a situation close to what Wascally identified. I was surfacing a production piece at .5mm and everything was fine until the last rotation when the router dropped as far as it could and changed direction. I can’t tell you what the x, y and z reading where as I immediately stopped the run and moved the router to inspect the damage. It should be noted that I could not raise the router by the z control button until I hand rotated the lead screw a few revolutions. I don’t know what other information I can give as like I said every thing was fine for 99.9% of the run and now I’m scared of proceeding with work on this due to the cost of the wood piece involved. If you think this is a problem different from Wascally’s let me know and I will proceed accordingly.

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Hi Chris,

I suspect your problem to be of other cause than what the op is describing. It is not clear to me if you use the surfacing tool in gsender. I believe I read yesterday that the surfacing tool is corrupted in the latest version (is it 1.5.5 now?) Sure the bug is has something to do with settings not taking, but you never know what consequences that has on the tool.

Since I had a bad run with the tool early in my cnc days (prolly due to me bleeping up, mind you) that killed my first makita, I have never used surface tool again and create my own in vectric. It’s mostly just a simple pocket toolpath, nothing too fancy.

Anyhooo, I get your reluctance to continue, I had the shakes too after mounting my new makita. I just examined what could have gone wrong and ended up concluding that I could bleep up the surfacing tool, but could not figure out how I did that. It got scrapped out of my work flow. Never used it again. Mainly because surfacing is so easy to do outside gsender and has never failed again.

Maybe if you, for now, create your own surfacing toolpaths (assuming you used gsender) you might gain some confidence back aswell.

I wish you strength and courage going forward. Elbows up!

Thanks for your input. I’ll see what happens and keep my figures crossed.

Chris