PMD-108-08
1 Flute Down Shear Polished Flute Carbide Router for Plastics and Aluminum
0.25-in Dia 1-Flute End Mill, 0.75-in LOC, 0.25-in Shank, 2-in OAL
OrderingPMD-108-08·$80.60
Best tool for plastics — polished single flute that eliminates material sticking to the tool and melting in the cut.
- 1 flute polished-flute design gives the chip the whole gullet, so soft plastics evacuate before they can re-weld or melt in the cut
- PM = up-shear (pulls chips up and out, best general chip clearance); PMD = down-shear (pushes down on the material for clean top surfaces and thin sheet hold-down); GTS = 2 flute straight (0° helix) for materials that must not lift at all
- Tuffy grade carbide substrate
- PM sizes 1/8"-1/2" including long versions (PM-108-06L, PM-108-08L); PMD in 1/8", 3/16", 1/4"; GTS in 1/8"-1/2"
- Metric MPM up-shear from 4mm to 12mm
- Also the best tool for gummy/soft aluminum — polished flute reduces material sticking to the tool
- Tolerances: cutting dia +0.000/-0.002, shank dia -0.0001/-0.0002, flute length +0.060/-0.000, OAL +/-0.060
- Materials: plastics, wood, aluminum; dry, wet, cold air, or spray mist
From the RobbJack Applications Guide.
About this series
PMD Downshear Tuffy Grade Carbide Router Bits
Polished single-flute downshear router bits for aluminum.
The PMD series is a line of 1-flute Tuffy grade carbide router bits with a polished flute and square end, designed for downshear cutting in aluminum. Cutting diameters run from 1/8 inch to 1/4 inch.
- 1 flute
- Polished flute
- Square end
- Downshear geometry
- Tuffy grade carbide
Aluminum, Plastics, Wood. Dry, wet, cold air, or spray mist.
Headline spec
Cutting diameters 1/8 inch to 1/4 inch; 1-flute polished downshear router.
Best for
- Slotting
- Side Milling
- Helical Interpolation
- Ramping
- Roughing
- Semi-Finishing
- Finishing
Specifications
US machining terms with ISO 13399 codes.
- Cutting DiameterDC
- 0.25″
- Diameter ToleranceDC tol
- 0.0000/-0.0020
- Max Cutting DiameterDCX
- 0.25″
- Shank DiameterDMM
- 0.25″
- Length of Cut (LOC)APMX
- 0.75″
- Overall Length (OAL)OAL
- 2″
- Number of FlutesNOF
- 1
- Helix HandFHH
- Left-hand
- Cut Direction
- Right-hand cut
- End Type
- Square End
- Center Cutting
- Yes — plunges
- Shear Direction
- Down-shear
- Series
- PMD — 1 Flute Down Shear Polished Flute Carbide Router for Plastics and Aluminum
Cuts these materials
Applications
Features
See it run
Tolerances
| Type | Min | Max |
|---|---|---|
| Cutting Diameter | 0 | -0.002 |
| Length of Cut | +0.06 | 0 |
| Overall Length | +0.06 | -0.06 |
| Shank Diameter | -0.0001 | -0.0002 |
Part PMD-108-08
Made & shipped in the USA · lead time confirmed at order. Test this tool in your spindle at retail, or get it through your RobbJack distributor.
Performance guaranteed. Run it against the tool you use today — if it doesn't beat it, we'll make it right.
Starting at
$80.60
PMD-108-08
Starting speeds & feeds for the PMD-108-08
Dial in for your machine →RobbJack's tested starting numbers for this exact tool, from the same engine and the same default machine as the calculator: a 12,000 RPM / 400 IPM / 30 HP machining center, rigid setup, full-depth cut. A faster or smaller spindle changes the RPM and feed — enter yours in the calculator and it re-governs every number.
| Material | Operation | SFM | RPM | Feed (IPM) | Chip load / tooth | DOC (in) | WOC (in) |
|---|---|---|---|---|---|---|---|
| Hardwoods | Roughing — full slot | 786 | 12,000 | 76.8 | .00640 | .2500 | .2500 |
| Hardwoods | Finishing | 786 | 12,000 | 38.4 | .00320 | .2500 | .0125 |
Read before you run
Recommendations are computed starting points based on typical conditions — not guarantees of performance, tool life, or fitness for your application. Machining involves inherent risk: you are solely responsible for safe operation, for verifying every parameter against your machine, spindle, toolholding, workholding, and guarding limits, and for proving all parameters on a test cut before production. RobbJack Corporation assumes no liability for tool breakage, machine damage, scrapped parts, production loss, or personal injury arising from use of these recommendations. By using this calculator you accept RobbJack's Terms & Conditions.
More in the PMD series
Same series, different size — what changes from this tool is shown in red.