Answer
Apr 14, 2026 - 06:40 AM
The number of cutterhead inserts or knives on woodworking jointers influences the smoothness of the cut, the frequency of knife changes, and noise levels. More inserts generally mean a finer finish, less tear-out, and quieter operation, while fewer knives can make changing and maintaining them simpler and less expensive. Jointers are available with as few as 3 straight knives or up to 58 helical inserts. For example, the Powermatic PJ1696 has 58 inserts for maximum performance, while the JET Black 8” Jointer uses 36 inserts, balancing quality and maintenance. The Powermatic PJ882 features a traditional 3-knife head for those who prefer classic jointer design. With such variety, you can find a jointer that fits your desired balance of finish, quietness, and upkeep.
