Router Cutter Diameters for a Dado in Ply

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scruffmeister

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I need to purchase a new straight router cutter to cut the dado recess to hold the back of a cabinet I am planning. I don't have any sheet material handy to check right now unfortunately, so wondering if a 6mm bit will work well for 6mm ply, or if the 6.35mm (true 1/4") sizing would give better results? Thanks.
 
What is easier? To make a groove/dado wider or to make a piece of plywood narrower/thinner?
 
You need to check the thickness of your ply. Quite a lot of plywood is actually undersize so some 6mm ply is actually 5.5mm
 
It might be the back but it could be structural glued all round so might need a decent fit
 
All other things being equal, a tight fit is desirable. I'll try and hold off ordering one until I have some 6mm sheet handy - only got the 18mm for the main structure currently. Thank you for the pointers.
 

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