Machine moves down at start of cut

[Rilgenfritz]

My machine has started plunging down at the start of the cut and then gouging into my stock. I’ve checked all my settings and nothing makes sense. I’m using the most recent update of Gsender with a Longmill 48x30. The machine has made several successful cuts, but now it just does this every time

[Spamming_Eddie]

Hi Rilgenfritz,

Your info is lacking some meat about your setup, so I am wildly pointing towards some pages and topics about z plunges that might or not help you out.

First something about plunges in the limit switch trouble shoot section of the manual.

Found here:

Limit Switches ⛔ - LongMill MK2 CNC

Some topics with solutions regarding plunging:

Z Axis Plunge is Wonky

That’s EXACTLY what I had done wrong. Funny enough my wife came out to the shop while I was holding me head muttering " why why why". I told her what the issue was, she came back out to the shop 2 minutes later and asked about the 0 set points in G-Sender / Carveco. She gets to wear the “I’m right” shirt yet again lol

Incorrect Movement Destroying Workpiece

Cnc newby-using Longmill with Vcarve Pro V12 and gSender. The machine will be working normally and part way into the project will suddenly plunge into the workpiece, destroying the project. It sometimes goes all the way through into the wasteboard and jams the router.

Router dipping below z-axis and cutting through project

Hey Everyone! I am brand new to CNC milling and I’m having an issue with either GSender or setting up my g-code in Fusion 360. What happens is when I use the Auto Zero touch plate, it zeroes perfectly. When looking at the project on GSender, it shows that the item is below the z-axis, but that is because I put my stock point on the top side of the stock in Fusion 360. When I do a Test Run, it will show the correct tool path, however, when I click the button to actually run the project, the z-axi…

Search prompt: Plunges
https://forum.sienci.com/search?q=plunges

Hope you find the culprit for this big problem. It’s a cripling one.

[gwilki]

@Rilgenfritz Have you resolved your issue?

[Rilgenfritz]

No, I have not. I still drops down below zero to travel to the start of the cut.

[gwilki]

@Rilgenfritz I’ll leave the topic open in that case. None of the proposed solutions that @Spamming_Eddie posted has worked for you, correct?
What CAD/CAM software are you using?

[Rilgenfritz]

Auto desk Fusion 360. No, I’ve tried using a post processor file in the community in hopes that was the solution, and checked all my heights in Fusion, but still getting the same result. The spindle drops down roughly .5 inches and travels to the start of the program, then raises up and begins cutting.

[Jens]

It sure sounds like the Z motor turns the wrong way because under normal circumstances it raises up (probably 0.5"), travels to the start position, drops down and starts the cut.