I am a new user and have a big error happening that is ruining projects. This is my setup. I am using Fusion 360. I have the top of my material set to 0 for z. After using a v bit to carve text, I change the bit to a ball nose and re-probe z. I load a new program to cut out around the text. It is supposed to go down a total of 1 mm (-1mm) in several passes. When I run the program, the bit dives in to the material about 1/4 to 1/2 inch. This has spoiled a really nice piece of flame maple and some acrylic plastic sheets. Lucking, the bit did not break and I stopped it as fast as I could. Does anyone know what is going on? What do I need to do differently? I can’t use the machine until I have this figured out.

Do you get the height using the probe or do you use the paper method???

I use the probe. I just ran it again and it was fine but suspect it will happen again. With my luck it will be when I am using expensive stock. .

I have had the exact same issue. Fusion, cut once, probe z, second cut plunges too deep. For me it happens when using a Spoilboard cutter. Lost a nice piece of walnut.

Happened to me as well, but always my fault. Wrong stock settings in setup once (I used two setups), wrong height settings second time (make sure you refer to correct heights especially if you make second or third bit and check your offsets…). [image]

If it’s a mistake you made in F360, you should be able to catch it by watching the simulation closely. In fact, F360 will warn you if you plunge too deep. Make sure you enable that option when simulating. [image]

You can also do an air cut. Just use a scrap block to set your Z-height well off your work and watch that initial cut. One thing I’m getting through reading all the questions about F360 on this forum is that it may have TOO many settings. -Mark

Yes F360 is complex but must agree with Alex, watch carefully simulation, it should show you any mistake you eventually make. After a few collisions I pay much more attention and also change view angle during my simulations, to be sure it really does what was intended…

After it happened, I checked the settings and they looked correct. It’s happened twice. I will follow the advice given and appreciate the help. I agree with Fusion 360 having too many settings. I am using it for free but wonder if it is a mistake. I understand it is the way it is because you can design anything and cut anything but there are so many options and settings it is difficult to do the simplest things. I try, try again and eventually need to search for a video for help.

Hi James, I have had a similar problem. I searched on the forum for ideas. What I came across was a post describing loosing z. The gentleman posted pictures and his loosing z was the result of a faulty/loose wire to the z step motor. For my project, the z step motor wire seems ok. I used the spare y step motor wire to temporarily replace the z wire going from the control box to the z axis. I was behind on my order and desperate. I have not checked the old wire yet with a meter, but suddenly my machine worked flawlessly. I am not sure if this is an indication of a bad wire, but I use a flash drive to load files. Most times it would take me 3 tries to upload the file so that the Remaining Time value appeared. When the Remaining Time value did not display, the machine run would be buggy. Another indication for me was that the loosing z or buggieness was alway 3/4 at the far end of the spoil board. At first I thought it might be a chip memory issue, but a kinked wire could also produce defects when ever it stretched a certain angle. After changing the cord, files load on first try. All this trouble shooting happend this weekend. My blood pressure has not come down yet. I can’t say you might have a bad z cable somewhere, but maybe look up that other post to get another explanation. If you have trouble locating the post, let me know you’re interested and I will link the post. Good luck. Carl My next post is the start of the thread post for lost z. If you can locate it and follow the thread , you can see how the gentlemen solved his lost z. To me it sounds similar to your issue.

Z Axis Changes During Cut - Onefinity CNC Machines - Onefinity CNC Forum [image] Z Axis Changes During Cut Machines (Original/PRO) The following has happened with gcode from both Fusion 360 and Aspire. While running gcode, the z zero is reset to a much lower setting without any user intervention. I’m talking a half an inch lower. I have cut deeply into my spoil board on a few occasions. Luckily I missed the t-track! I had assumed this was due to some user error (it may still be), but now I’m not so sure. Tonight, I was cutting the Marvel Aztec calendar. I loaded the gcode, zeroed the x y and z, and began cutting. In less t…

After changing bits and probing Z, the Z is way off?

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Cjd1 (Carl Dombrowik) January 25, 2022, 12:16am 14

Z Axis Changes During Cut - Onefinity CNC Machines - Onefinity CNC Forum

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After changing bits and probing Z, the Z is way off?

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