Reply by REO

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Posted on How do you make positive/negative router patterns?

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929 posts in 2525 days

#1 posted 04-10-2013 11:11 PM

unless you can use the cut line and there is no kerf it will always take two patterns for anything but a straight cut. OHpin routers still need two patterns for this type of cut unless they fudge the construction as you have thought out. I have used autocad and offset the pattern for the tool diameter and sanded to the lines to make the pattern.
It looks as though the ends are proud of the top surface.
Your best bet may be to cut them with the same pattern and then use a router with a template and cut a trough in the edge of the end piece without breaking the sides and then carefully fit the end of your top as though it were a tenon to fit the trough. Any discrepancy would be covered up with the overlying edge of the end piece. dowel or biscuit the end on. The 3/16” edge would be much like the edge of a seam binder for hardwood floors.

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