I am having an issue with several files where I am trying to do a simple V-Carve of an small image onto 4" round Bamboo coasters. The actual flat carving area available is 3.75 inches by 3.75 inches. I set my workpiece up as 3.75 by 3.75 and my carve
depth is on set at .075. I am using a 45 degree V-carve bit. I set my X, Y, & Z and even go back and check them by having the spindle go to the XY, etc. and everything seems spot on. In the Job Setup, Toolpath Zero is set to Lower-Left. However, after loading the job and starting the job, the spindle goes opposite my workpiece (Negative XY) as if it is mirrored, the spindle drops down and it starts carving in the air.
Usually this is caused by a mismatch between job setup:
https://carbide3d.com/hub/courses/create/job-setup/
and how origin is set relative to the stock:
https://carbide3d.com/hub/courses/running-shapeoko/movements-zeroing/
I find that opening the .c2d file up and drawing a box which matches the specified dimensions (draw up the cut in profile if need be) or moving the machine to the origin and then using a tape measure to measure out the dimension(s) in question will make clear where things aren’t lining up.
If you continue to have difficulties, upload your .c2d file and let us know step-by-step how you are securing your stock and setting zero relative to it and managing all tool changes and upload a photo showing the machine at the zero position relative to the stock (or a specified offset from that position) and a screengrab showing what Carbide Motion shows.
I use center for most of my projects and specifically on round objects. There are many ways to find the center. I usually also use bottom of material on any project that cuts all the way through. If you pick bottom of material but set Z on top of material you get an air job.
Here are a couple of ways to find center.
Try this process that I use with both my laser and cnc. Set your origin in the center of your model. Then draw a circle the exact diameter of the coaster (the exterior . the coaster will need to fit inside of it). Offset or draw another circle inside of it to 3.75". Center your vectors in that circle.
Take say a 10" x 10" or so piece of 1/4" ply (underlayment) mark the center of it and attach it to your spoilboard. Set the X & Y zero to that center. Use the outer circle to cut out and make a simple placement jig for the coaster. Attach the coaster inside your jig, Z zero to the coaster and machine away. Works perfect every time.
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