3-flute Fingerboard Planing and Radiusing Bits (MM3I8) - (0.125 in. and 3.0mm shanks)

• Geometry - 3 flute, 1/8 in. and 3.0mm shanks, corner-radius (bull-nose) tip style
• Length - 1.5 in. ±0.010 in.
• Cut diameter -
  • 0.1250 in. +0.0000, -0.0020 in.
  • 3.0mm +0.00, -0.05
• Flute corner-radius - 0.025 in. (0.64mm) ±0.001 in.
• Max runout (TIR) - < 0.0005 in.
• Max. depth of cut - nominal ±0.005 in.
• Anticipated Life - 3,000 linear inches (cross-grain ebony, CNC milling)
• Material - solid submicrograin carbide
• Ring Set - 0.800 in. ±0.002 in. (optional)
• Operating RPM - CNC certified operation 20k RPM to 100k RPM
• Feeds/speeds - to determine the optimum Feed/Speed combinations,
  click on the Feeds/Speeds tab

• Bull-nose tip-style minimizes "witness" lines and provides smooth, scallop-free cutting at high chiploads
• High flute volume supports high feed rates / chip loads
• 3-Flute design eliminates chatter at high feed rates
• 3-Flute design brings the rigidity and precision of a stub mill to a high-aspect ratio cutter
• Cutting edge geometry tuned for cutting all common fingerboard materials that have inlaid components of mother-of-pearl, recon stone and precious metal

• Tool Type: Radiused End Mill
• Diameter (D) =
  • 0.1250 inches (3.18mm)
  • 3.0mm (0.1181 in.)
• Tip Radius (R) = 0.0250 inches (0.64mm)
• Stepdown (pass depth, depth per pass)
  • 0.1250 inches (3.18mm)
  • 3.0mm (0.1181 in.)
• Stepover:
  • 0.023 inches (5.72mm)
  • 18% (of tip diameter)
• Spindle RPM (SPEED): click on the Feeds/Speeds tab
• Feedrate (IPM): click on the Feeds/Speeds tab
• Plunge rate (based on wood hardness):
  • Softwood (Janka < 1,500) = 75 inches/minute
  • Medium hardness hardwood(1,500 < Janka < 2,500) = 50 inches/minute
  • High hardness hardwoodwood (Janka > 2,500) = 40 inches/minute

• Finding the best combination of feed and speed
• Selecting the proper Collet Grade for your application
• Minimizing system runout with proper spindle maintenance
• Look up Janka values for common and exotic hardwoods in the Wood Hardness Table

You can use the Feed and Speed Calculator link below to accurately determine the the optimum RPM and feed rate to use when planing or radiusing your fretboard. These number assume the you have used the tool parameters under the Application Data tab to set up the bit in your CAM tool database (CAM tool table).

After you click on the Feed and Speed Calculator:

1. Enter the RPM (for bits this small, use your maximum RPM)
2. Enter 3 for the number of flutes
3. Enter 0.125 (or 3.0mm for metric calculation using 3mm shank tool) for the tool diameter
4. In the "Percent of tool Diameter" field, enter:
   • 3 if you are planing or radiusing a naked hardwood fretboard
   • 1 if you are planing, or radiusing, a hardwood fret board that has already been inlaid with components made of mother-of-pearl or similar materials
5. In the "Runout" field, enter:
   • 0.0003 if you are using a spindle with certified Extreme Precision collets
   • 0.0005 if you are using a consumer-grade router with certified Extreme Precision collets
   • 0.005 if you are using a consumer-grade router with a non-certified after-market collet
   • NOTE:If you are using a consumer-grade router with a non-certified 1/8 in. collet adapter you will probably NOT be able to use this bit due to excessive runout.
6. Click on the "Calculate Feed"