Profile Cut cutting through the material and onto the Spoilboard

[MasterChief]

I added a supplemental spoilboard and tramed and surfaced the additional spoilboard that sits on top of my primary spoilboard. I did a 3d rouhing pass and finish pass with no problem. When I went to do a profile cut, Vectric estimated 12 passes on 3/4 cherry wood.

However within 7 passes the cut was 50% complete but had already gone through the material and cut about an .125 into the spoilboard.

Was I suppose to make adjustments in the software when I added the secondary spoilboard? The secondary spoilboard is .75 thick after surfacing it is probably about .70

Please help

[SteveNelson46]

Where did you set z-zero on the machine?

[MasterChief]

Left Corner of the Material. Material Surface

[4DThinker]

Somewhere, someplace in the setup for the job or the toolpath a mistake was made. Happens to me once a month or so. OK, maybe twice a month. For 3/4" material, normal settings for a 1/4" end mill would be six 1/8" deep passes. 12 passes would have cut 1.5" deep.
A slight possibility is that you were using a 1/8" end mill, which would take 12 passes to get through 3/4" cherry, but may have come loose and started slipping out of the chuck. Upcut bits like to do that if not tightened well, or put into a chuck full of sawdust that might seem tight but wouldn't be due to the debris packed into it. These are things to check. If you switched bits between the 3D toolpath and the profile toolpath you may have forgot to reset Z. I have also made that mistake a few times.
4D

[Gasawdust]

When was the last time you calibrated you z height?

[metalworkz]

Hello, I only read through this thread quickly but one thing that comes to mind for people using Mach3 is to regenerate the toolpath after you have made changes or set your Z zero. I normally will use a 1" block and set my Z at 1" and then input 1.000 into the field for the Z after I have set it to that height. I have very easily forgotten to input the actual Z height and begun carving only to notice the Z cuts far too deep (and even botched up my material!) on occasion! I got in a habit of hitting regenerate button every time before starting my toolpaths to avoid such mishaps. I know may not be the case here but thought it was worth mentioning.