1/4" Plunge Roundover
A 1/4” roundover that runs in the CNC, not a hand router. No bearing: the pilot is a ground nose on the bit itself (Whiteside calls it a plunge point), which is what makes it CNC-usable at all — nothing to ride, so the toolpath does the guiding and it can even plunge.
Specifications
| Property | Value |
|---|---|
| Radius | 0.250” |
| Large diameter | 0.750” |
| Small diameter (pilot) | 0.250” |
| Shank diameter | 0.250” |
| Cutting length | 0.375” |
| Overall length | 1.875” |
| Geometry | Plunge roundover, solid pilot |
| Material | Carbide tipped |
Feeds & Speeds
For the X-Carve Pro and its 1.5 kW spindle. These match the presets stored on this tool in the Fusion hub library. Chipload is figured at the rim, the 3/4” top of the arc; engagement on an edge pass is a light quarter-round sliver, so one pass at full profile is the normal cut.
| Material | RPM | Feed | Chipload | Plunge | Stepdown |
|---|---|---|---|---|---|
| Hard maple / oak | 16,000 | 100 ipm | 0.0031” | 30 ipm | full profile |
| Soft maple / walnut / cherry | 16,000 | 120 ipm | 0.0038” | 30 ipm | full profile |
| Plywood | 16,000 | 130 ipm | 0.0041” | 35 ipm | full profile |
| MDF / laminate | 18,000 | 150 ipm | 0.0042” | 40 ipm | full profile |
| Softwood / pine | 18,000 | 150 ipm | 0.0042” | 40 ipm | full profile |
| Acrylic / HDPE | 12,000 | 80 ipm | 0.0033” | 20 ipm | full profile |
Same logic as V01: profiling cuts with light engagement run higher RPM than the chipload method would normally allow, and the programmed feed is a ceiling the machine rarely reaches on a contour full of corners.
Notes
Run it as a 2D Contour along the top edge, depth set so the arc lands tangent to the top face. In the library it’s typed as a radius mill, so Fusion models the full profile (1/4” pilot, 1/4” radius, 3/4” shoulder) and the toolpath comes out right without offset tricks.
The pilot is solid, not a bearing. On the CNC it mostly cuts air below the arc, but wherever it does touch, it touches at spindle speed. Don’t let a toolpath park it against a finished face, and don’t dwell in corners.
Do this after the part is cut free or tabbed, like any finishing pass. The side load is small, but a rounded edge is a visible edge; it deserves the same workholding care as a finish contour.
Links
- Product page: Whiteside 2052
- Machine: X-Carve Pro
- CAM library: Fusion hub library, Human Crafted