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post #1 of 5 (permalink) Old 12-17-2007, 04:39 PM Thread Starter
Join Date: Dec 2007
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Default Rabbeting

Hi --

I want to make a simple 2 foot long single wall shelf. The shelf is 3/4 red oak and I was going to put a thin strip of wood for the backing and cutout two supports (so a basic wall shelf).
I want to make a dado for the backing to slip into then glue/nail that together.
What I don't understand is that the rabbeting router bits seem to be 3/8 -- but I need my rabbet to be the thickness of the backing which is 3/4.

What is normally done:
-use a 3/8 piece for the backing instead of the standard 3/4?
-don't use a rabbeting bit but rather a cutter to make a 3/4 dado?
-rabbet both pieces 3/8 deep and 3/8 length so that the two pices then fit together

Thank you for any ideas!
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post #2 of 5 (permalink) Old 12-17-2007, 07:35 PM
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Hi ITN. If I've understood correctly, you could make two passes with the 3/8" bit to give a 3/4" groove. Alternatively, take the ends of your shelf down to 3/8" to slot into a 3/8" dado (like a tongue & groove).

I've cut it twice and it's still too short! But only at one end.
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post #3 of 5 (permalink) Old 12-17-2007, 07:47 PM
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Hi ITN, thanks for the question and welcome to the Routerforums.

the "Doctor"

In woodworking there is no scrap, only firewood.

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post #4 of 5 (permalink) Old 12-18-2007, 02:04 PM Thread Starter
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The bit has a collar on it so I think I can only do one pass. That is the part I do not understand -- it seems like having a collar forces me to only 3/8. I realize I must be missing something so if you comment on the above it would be appretiated.
Thanks for your help and time!
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post #5 of 5 (permalink) Old 12-18-2007, 03:59 PM
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Hi: The collar or bearing is on the rabiting bit to guide the bit to the 3/8ths depth. If you were going to use 1/4" material for the back it would work fine. You should use a 3/4" straight bit and a guide for the router to ride against, to make the 3/4" rabits, in the edges of the material. I have a rabbiting set that has a set of bearings so that you can make diferent depth rabits, or mount a bearing the exact width of the cutter and use it as a flush trimmer bit. You might also consider making the rabits with a
dato set on a table saaw. Hope this helps... Woodnut65
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