1/8" 2-Flute Up Cut Spiral
Ties D06 for the deepest-reaching 1/8” bit in the shop: a full 1” of flute on a bit that thin, double D03’s 0.5” and U07’s 0.5”. Bits & Bits lists this part as discontinued and replaced by their 820-SRF125, but the physical bit reads DF125UP, so that’s what’s recorded here.
Specifications
| Property | Value |
|---|---|
| Cutting diameter | 0.125” |
| Shank diameter | 0.125” (straight through) |
| Flutes | 2 |
| Cutting length | 1.000” |
| Overall length | 2.000” |
| Geometry | Up cut spiral |
| Corner radius | None — square end |
| Material | Solid carbide |
| Coating | AstraHP |
Feeds & Speeds
For the X-Carve Pro and its 1.5 kW spindle. Same halved-from-1/4” chipload as D03, but upcut stepdown instead of downcut — chips evacuate upward on their own, so only the diameter (not chip-packing) limits the depth per pass, giving roughly double D03’s stepdown at the same chipload.
| Material | RPM | Feed | Chipload | Plunge | Stepdown |
|---|---|---|---|---|---|
| Hard maple / oak | 14,000 | 110 ipm | 0.0039” | 30 ipm | 0.125” |
| Soft maple / walnut / cherry | 14,000 | 120 ipm | 0.0043” | 30 ipm | 0.125” |
| Plywood | 16,000 | 140 ipm | 0.0044” | 35 ipm | 0.125” |
| MDF / laminate | 16,000 | 150 ipm | 0.0047” | 35 ipm | 0.1875” |
| Softwood / pine | 16,000 | 150 ipm | 0.0047” | 35 ipm | 0.1875” |
| Acrylic / HDPE | 12,000 | 100 ipm | 0.0042” | 20 ipm | 0.0625” |
Notes
Plunges fine — this is an upcut, no chip-packing problem. Unlike every downcut in the drawer, a straight Z plunge here just augers chips up and out as it goes.
Tears the top face on plywood and veneer. Same tradeoff as every upcut: the geometry that clears chips so well also lifts and chips the top surface fibers on the way up. Reach for D03 or D04 instead whenever the top face shows.
1” of cutting length ties D06 for the deepest reach among the 1/8” bits — deep enough for a mortise or a slot through the better part of an inch of material, where D03/D04/U06/U07 all top out around 0.5–0.56”. Reach for this one over D06 when the top face doesn’t matter and upcut evacuation is worth more than a clean surface; D06 for the reverse.
Links
- Product page: Bits & Bits DF125UP
- Machine: X-Carve Pro
- CAM library: Fusion hub library, Human Crafted (T15)