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Reply by tenontim

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

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tenontim

2131 posts in 4192 days


#1 posted 04-10-2013 04:18 PM

I make a jig like this one. I set the end pieces so the opening is about 1” wider than the table top, so that I can insert a wedge from each side to hold the jig in place. Use the jig initially to square up the ends of the table top, by using your router to cut off the ends square. Do this in several passes, to prevent burning up your router or a bit. I use spiral bits. After you have it square, move the jig back the distance you need for the amount of tenon you want on the end of the table top. Set your router to the proper depth to get the thickness of tenon desired and remove the waste with the router. I use a straight, flat bottom bit for this. Make your first cut next to the jig, then move towards the edge. Make sure you support the router on the uncut section of table top next to the jig, to prevent it from tipping.


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