Review on Concord Blades WCB0650T060HP General Purpose by Gordie Johnson

I have used a Concord saw blade in a table saw and after installing the saw blade noticed I saw a twist in the wood and found out why. Looking at the blade, I could see it wobble as it slowed. I used a precision impact sensor to measure blade vibration and measured 10 mils. This is far in excess of what would be desirable, which is typically less than 5 mils. The manufacturer allowed me to return and replace the blade. Before using the second new blade, I also measured its runout at 10 mil. Table saw to eliminate it as a contributor, which was <0.5 mil. This mandrel runout needs to be multiplied by 5 to get the theoretical runout of a perfectly straight 10" disc near the teeth, so about 2.5 mils. The conclusion is that the table saw was good, and since the runout of the Both Concord blades have been measured at 10 mils, this is a blade issue. To be honest, the manufacturer doesn't list the runout, and these are inexpensive blades, clocking in at $17 at the time of this review. Therefore, if you buy this blade, it is intended for coarser cuts where precision is not required.