This Big Stiffy series 1/4″ radius ball nose bit (1/2″ inch diameter) for CNC routers is excellent for juice grooves on cutting boards. Also great for radius accent work when carving signs on your CNC router. Cuts fast and clean. With a 1/4″ shank, it is suited well to remove large amounts of material in a single pass. The ‘super-shear’ blade design is designed to leave exceptionally clean cuts at higher feeds rates.
Why is it called the Big Stiffy? 2 reasons. The first is, this bit has extra mass, which absorbs vibration you’ll find in other large CNC bits. The second reason is, the overall bit length is shorter than the standard bit. This little design modification keeps your bit stiffer during cuts, which gives you a 50% improvement in your surface finish. In other words, the potential for chatter is virtually eliminated.
This bit has a carbide blade brazed to a 4140 body.
- Shank: 1/4″ (6.35mm)
- Radius: 0.25″ (6.35mm)
- Cut diameter: 0.5″ (12.7mm)
- Length: 1.75″ (44mm)
- Flutes: 2
- Flute length: 0.5″ (13mm)
- Material: 100% tungsten-carbide tipped
- Feed: 60 inches per minute (25mm/sec)
- Speed (rpm): 10000-14000
- Max pass depth: 0.11″ / 3mm
- Stepover: 40%
- For CNC routers, see this speeds & feeds table
FREE Feeds & Speeds table PDF. Download by clicking here