Whiteside SBU40-3 Spoilboard Cutter - Up Cut - 4″ CD x 3/4″ Shank

$599.00 $705.00

SKU: SBU40-3 Whiteside Machine Company

Only 5 left!

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Materials: Natural woods, composite woods, hard plastics

Recommended RPM: 10,000-12,000 (max 12,000)

These large CNC Surfacing bits are designed to resurface your workpiece or CNC spoilboard. The bit has a straight cut and extended life through the use of replaceable carbide inserts.

  • TOOL SPECS: Carbide-tipped large CNC spoilboard surfacing up shear cut bit with 4" large diameter, 3/4" shank, and 3 wings for use with 3/4" collets.
  • SURFACE FINISH: Designed to deliver a smooth, high-quality finish on the top surface of your project. Commonly used for flattening slabs or resurfacing a CNC spoilboard.
  • UP SHEAR DESIGN: Ideal for flattening large areas prone to tearout on your CNC machine, delivering smooth results while protecting delicate materials.
  • THREE FLUTE: Three-flute design provides a smooth finish on cutting boards, spoilboards, and wood slabs.
  • CNC APPLICATION: Ideal for flattening and leveling large material surfaces on your CNC machine—ensures consistent depth and smooth results across wide areas.
  • REPLACEABLE CUTTERS: Features replaceable carbide inserts for maximum efficiency and longevity. Inserts can be rotated so that each edge of the insert can be used.

Availability: In stock at our supplier — typically ships in 3–7 business days. Contact us to confirm lead time on larger quantities.

Feeds & Speeds
Based on published chip-load charts. Full calculator →
Cut not coming out right? Melting, chipping, burning or tearout — the Cut Doctor reads your settings (or a photo of the edge) and gives you the cause, corrected numbers, and the bit that fixes it. Free, no signup.