This is an idiots question Im afraid. I want to router some grooves 18 mm Mdf. for a book shelf - just a narrow one. In the past I have used an 18 mm router bit and it is never the snug fit logic would suggest. Not my technique - somewhere in the back of my mind years ago I believe I heard that you had to use a smaller router bit. Could someone tell me what size I should be buyng when I go to the shops over the weekend
Thanks for any help - Keith