I have a piece to cut larger than my table so I setup to "tile" cut with two operations. I'm using a 2D contour operation setup for three even step downs on my DIY CNC router.

Click image for larger version.  Name: Tile Sheet.jpg  Views: 0  Size: 46.7 KB  ID: 463168

The problem is the 8 deg. ramp down seems to be ignored. Or the cut is doubling back all the way to the beginning of the cut as if to cut in one direction only. Either way it is doubling the time to cut and adding ware to the tool.

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I selected "cut both ways" and there is no difference.

The odd thing is for smaller pieces completely within the stock contaminant ramp properly.

Attachment 463166

Something about the contaminant boundary seems to mess up the ramp. All the online example are using a single pass cut. I can't with my DIY machine.

Any ideas how to fix the ramp issue?