# Cornering a width of board without waste.

 Forum topic by MarkTheFiddler posted 11-30-2014 01:08 AM 1304 views 0 times favorited 12 replies
 MarkTheFiddler2068 posts in 2215 days 11-30-2014 01:08 AM Topic tags/keywords: tip trick Howdy, You might be able to take advantage of this math equation. Its a little basic algebra that can really help. How do you turn this:Into this?: I’m not talking about the rabbit cuts. I’m talking about how to calculate exactly how much to rip so when you glue up the two parts you get the piece that is as thick as it is wide. Take a few measurements first.Width of board.Thickness of board.Thickness of blade or kerf. What we are going to do is cut the width narrower, then add the offcut to the thickness so width = thickness. We are just talking about 2 sides here. ;) Here we go. Width minus kerf minus offcut equals thickness plus offcut.Orwidth – kerf – offcut = thickness + offcut.OrW – K – Oc = T + Oc So we have.1\2(W – K – T) = Oc let’s try it with something that is very conveniently simple.Width 3 and 1\8.Thickness = 1Kerf = 1/8 We now have1\2(3 and 1\8 – 1\8 – 1) =OcWe can work it through a little.1\2(2) = Oc1=Oc Let’s check it out. We had 3 and 1\8. We cut off 1 inch and lost 1\8 kerf so its now a width of 2. We glued that 1 inch offcut to the thickness and got a thickness of 2. That one was easy because we can see it in our heads. When you are using what you have available. The math comes in handy. No need to guess and your calculator can make quick work of the fractions. Hope it helps. -- Thanks for all the lessons!