The spiral bits originated in milling and CNC work, where the bit was kept on top of the work as if it would be used on a handheld router. This means that an upcut bit will pull work towards the rotary motor, while a downcut bit will push work away...
WOODWORKING TIPSDIFFERENCE BETWEEN UPCUT AND DOWNCUT
[WEEKLY TECH TIPS] THE DIFFERENCE BETWEEN UPCUT AND DOWNCUT CNC ROUTER BITS
Upcut spiral bits are the most popular type of spiral fluted tool. Use these for grooving or slotting, for upward chip evacuation and best finish on the bottom side of the part. These bits allow for rapid cuts since the tool clears the chips away from the material. While ideal for...
