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post #1 of 17 (permalink) Old 04-12-2011, 08:05 PM Thread Starter
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Default plywood dado

Can I use a router to cut Dado on plywood sheet
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post #2 of 17 (permalink) Old 04-12-2011, 08:21 PM
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Of course you can, the sharper the bit the better the cut. You might try a down spiral bit to reduce tear-out.
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post #3 of 17 (permalink) Old 04-12-2011, 08:27 PM
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Hi Salem, Welcome.
If you are going to fit ply into your dado, they make bits that are undersize for a better fit. 3/4" ply is not always 3/4". Its usually undersize. Same for the other sizes of ply. If it's MDF that usually is ok unless it is MDF light which is thinner like ply.
Undersized Plywood Router Bit Set - Rockler Woodworking Tools

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post #4 of 17 (permalink) Old 04-12-2011, 09:08 PM
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Hi

Compression Up/Down Spiral Router Bit

This 2 flute solid carbide bit is needed to get clean, chip-free and splinter-free cuts in composite sheet goods such as Melamine or 2-sided Formica/Laminates and veneered plywood.
The Up-shear/Down-shear design of the bit cuts toward the center of the sheet from both sides at once, saving time and eliminating waste.

MLCS solid carbide router bits

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post #5 of 17 (permalink) Old 04-12-2011, 09:29 PM
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G’day Salem

Welcome to the router forum.

Thank you for joining us

James
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I don't profess to know everything, and I may learn something new.

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post #6 of 17 (permalink) Old 04-14-2011, 03:22 PM Thread Starter
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Thank you for the answer, I was told never rout plywood
I am in fact planning to use 19 ply plywood inported from russia by Langevin et Forest, as the layers are very thin I am expecting this wood to behave like a solid wood but you never know, I will try finger joint but most likely will revert back to Dado if I experience tearout.
Thank you
Salem
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post #7 of 17 (permalink) Old 04-14-2011, 03:25 PM Thread Starter
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thank you, this forum looks very interesting, I am already finding lots of answers to my questions
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post #8 of 17 (permalink) Old 04-14-2011, 03:34 PM Thread Starter
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Thanks Jame I am in fact planing to use an undersized bit and cut 2 times, I have an other question is a plywood bit would make a cleaner cut?
Thank you
Salem
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post #9 of 17 (permalink) Old 04-14-2011, 10:13 PM
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Salem,
James posted a link to a video recently showing how to make a router guide for cutting grooves. Maybe if he sees this he will repost it. It is a thick piece of mdf or plywood which acts a fence glued to a thin piece of plywood which is wide enough that you have to cut a bit off when you make your first router pass. This shows where your bit will cut. (You have to keep using the same bit every time of course). All you have to do that way is to put a piece of your plywood edge down on the piece you want to rout and pencil mark it. Place the guide on one line and cut then put the guide on the other line and cut that side. Doesn't matter what your plywood thickness is, you will always use the same bit. When you make the guide use a factory edge for the side the router will butt against. The other side doesn't matter.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #10 of 17 (permalink) Old 04-15-2011, 03:12 AM
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I done a lot of this recently, our 3/4 ply in the uk is actually 18mm, I bought a 18mm bit and it done the job with excellent results
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