Premium CNC & Router Bits for Precision Cutting

Choosing Spiral Bits for Bowl and Tray Routing

Choosing Spiral Bits for Bowl and Tray Routing

By Premium CNC & Router Bits for Precision Cutting | Published: 2026-10-19

Category: Product Reviews

Learn how to choose bowl and tray router bits for clean, efficient routing. Compare Whiteside 1370, 1374B, and 1376B to match your project.

Quick answer

For most bowl and tray routing, choose a bit with a 1/4-inch corner radius for a smooth curve, and match the shank size to your router or CNC collet. Consider a bearing-guided version (like the Whiteside 1374B) for template work, or a plain bit (like the 1370) for freehand or CNC use.

Corner radius: the key to the profile

The corner radius determines the curve at the bottom of the cut. A 1/8-inch radius creates a tighter, shallower curve—ideal for small trays or detailed work. A 1/4-inch radius gives a more open, sweeping curve that suits larger bowls and juice grooves.

Think about the visual and functional result you want. A tighter radius leaves a more defined transition between the wall and bottom, while a larger radius makes cleaning and finishing easier.

Bearing or no bearing?

Bearing-guided bits let you follow a template or an existing edge without a fence. The Whiteside 1374B includes a bearing for template routing, and you can remove it for CNC use. This versatility makes it a smart choice if you switch between hand routing and CNC.

Bits without a bearing, like the Whiteside 1370, are better for freehand or CNC work where you control the path. They also tend to be slightly less expensive.

Shank size and router compatibility

Shank size must match your router collet or CNC spindle. The 1/4-inch shank (Whiteside 1370) fits most trim routers and compact CNC spindles. The 1/2-inch shank (1374B, 1376B) is more rigid and reduces vibration—preferred for larger cuts and production work.

If you have a router with a 1/2-inch collet, choose a 1/2-inch shank bit for better stability. If your machine only accepts 1/4-inch, the 1370 is your option.

Decision rules for choosing a bowl and tray bit

  • Match the corner radius to the project size: For small trays or shallow bowls (under 6 inches wide), choose a 1/8-inch radius like the Whiteside 1370. For larger bowls or juice grooves, pick a 1/4-inch radius (1374B or 1376B). A 1/4-inch radius is the most versatile for general bowl and tray work.
  • Decide between bearing and non-bearing: If you plan to follow a template or an existing edge, choose a bearing-guided bit like the Whiteside 1374B. If you only work freehand or on a CNC, a plain bit like the 1370 saves cost and avoids bearing interference. A removable bearing gives you both options in one bit—worth the extra cost.
  • Check shank size against your machine: Use a 1/4-inch shank (1370) for trim routers or CNC spindles with a 1/4-inch collet. For larger routers or CNC with a 1/2-inch collet, choose a 1/2-inch shank (1374B or 1376B) for better rigidity. If your machine accepts 1/2-inch, always prefer that for stability.

Product facts

Who should choose which bit

Best for

  • Small tray and bowl makers using a trim router—choose the Whiteside 1370 with its 1/4-inch shank and compact size.
  • Woodworkers who need a versatile bit for both template routing and CNC—choose the Whiteside 1374B with its removable bearing.

Not for

  • Large production bowls or deep cuts—consider a larger diameter bit like the 1-1/4-inch Whiteside 1376B for faster material removal.

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