PreciseBits EM4E8 Countersink

Overview

These PreciseBits brand 'V' bits feature a four flute design which ensures long life and quiet operation. With their 1/8" shank combined with a 1/4" cutting head these bits offer a great mid-size alternative to our smaller 1/8" 'V' bits and the standard large 'V' style bits used for woodworking. If you need to do scoring, beveling, carving or engraving in wood, phenolics, composite materials or non-ferrous metals then these bits would be a great choice.

The unique cutting edge geometry virtually eliminates chatter at high feed rates. The four flute tip is plungable, unlike may 'woodworking' style bits. Possible uses include dimensional signage, engraving and PCB beveling/countersinking.

• Geometry: 4 flute, 1/4", (6.35mm) dia. 1/8" (3.18 mm) shank, "V" point
• Length: indicated ±0.010"
• Tip angle: nominal ± 0.5°
• Max. depth of cut - DOC (penetration) varies by tip angle:
  • 60° - 0.217" (5.5mm)
  • 82° - 0.144" (3.7mm)
  • 90° - 0.125" (3.2mm)
  • 100° - 0.105" (2.7mm)
  • 120° - 0.072" (1.8mm)
• Shank dia: 0.1250" (3.18 mm) +0.00", -0.0002"
• Runout (TIR): 0.0002" max
• Max.DOC: EFL varies by tip angle
• Anticipated Life: 6,000 linear inches (phenolic, CNC milling)
• Material: solid sub-micrograin carbide
• Ring Set: 0.800" +-0.002"
• Operating RPM: CNC certified operation 20k RPM to 100k RPM

Applications

• Dimensional signage
• Engraving plaques, awards, medallions, and labels (water based cutting fluid recommended)
• PCB beveling and countersinking

Bit sizes