It’s of pivotal importance to install the appropriate cutterheads for your jointer or thickness planer when engaged in a woodworking project. There are three main types of cutterheads: straight, spiral, and helical. Obviously, it’s easy to tell straight from the other two cutterheads. As for spiral and helical, because of their similar appearance and function, it might be difficult to figure out their differences. Understanding the differences can help you select the right cutterheads for your project. So, today, we’ll compare spiral and helical cutterheads to give you inspiration for which one is right for your job.

A spiral cutterhead consists of a cylindrical shaft with several rows of small carbide insert knives arranged in a spiral pattern around the shaft. Unlike traditional straight cutterhead, these small inserts contact the wood board continuously, reducing tear-out and creating a consistent and smooth cut. Tungsten carbide is the second hardest material in the world, so these insert knives feature an extended service life and low maintenance. Spiral cutter heads are more suitable for low-density wood.

A helical cutterhead also comprises a cylindrical shaft with rows of small carbide turnover knives that are positioned in a helical pattern around the shaft. Thanks to multiple cutting blades, helical cutter heads can produce a nicer finish on the wood surface than straight cutterheads. In addition, helical cutterheads are quieter because of less vibration during the cutting process. Usually, the carbide insert knives have four cutting edges. When one edge is damaged or dull, just change to a new edge, reducing downtime.