Cast iron · ISO K
Gray iron, Class 30 speeds and feeds
Also: EN-GJL-250, GG25, FC250
Starting points from the same engines as the calculators, with no tool or setup picked. The first number is where to start; the range is what the manufacturer charts allow. Open a calculator for your tool, machine and cut.
Draft data: researched from manufacturer charts, not yet reviewed by a machinist.
Machining notes
- Short chips, abrasive. Often run dry. Watch for sand and scale on the skin.
As cast245 HB
Turning
| Cut | SFM | Feed, IPR | Depth, in |
|---|---|---|---|
| Finishing | 982666–1,402299 m/min | 0.0070.004–0.0100.18 mm/rev | 0.0220.004–0.0400.6 mm |
| Medium | 825560–1,178251 m/min | 0.0140.007–0.0200.34 mm/rev | 0.0850.012–0.1582.2 mm |
| Roughing | 775526–1,108236 m/min | 0.0170.010–0.0240.43 mm/rev | 0.1490.060–0.2373.8 mm |
For a CVD carbide insert, general stability, 15 min tool life.
Milling, solid carbide end mill
Speed 269 (135–359) SFM · 82 m/min
| Cutter Ø | IPT | mm/tooth |
|---|---|---|
| 1/8" | 0.00060.0005–0.0006 | 0.014 |
| 1/4" | 0.00190.0017–0.0020 | 0.047 |
| 1/2" | 0.00340.0028–0.0040 | 0.086 |
| 3/4" | 0.00470.0033–0.0060 | 0.118 |
| 1" | 0.00610.0041–0.0080 | 0.154 |
Drilling, Ø1/2" at 3×D
| Drill | SFM | Feed, IPR |
|---|---|---|
| HSS | 8850–125 | 0.00980.0070–0.0150 |
| Cobalt | 10471–132 | 0.00980.0070–0.0150 |
| Solid carbide, through-coolant | 436285–660 | 0.01020.0050–0.0153 |
Feeds scale with drill Ø (0.5" here): the drilling calculator sets them for yours.
Tapping
No sourced tapping speed for cast iron yet.
Sources
- Sandvik Coromant — Workpiece materials (MC codes, kc1, mc)
- Kennametal — Turning Inserts, Carbide, RP geometry: starting speeds and feeds
- Mitsubishi Materials USA — Optimum Grades and Chip Breakers for External Turning
- Harvey Tool — General machining guidelines, carbide end mills (SFM and chip load by diameter)
- 6G Tools — Carbide end mill speeds and feeds, general purpose, uncoated (incl. chip load factor)
- Kennametal — HARVI I TE: 5% radial / 2×D axial dynamic milling, 60% / 1.75×D side milling
- Uddeholm — Impax HiHard machining data: slot milling axial depth ≤ 1 × D
- Sandvik Coromant — Formulas and definitions for milling (net power)
- ISCAR — Machining titanium: average chip thickness hm = fz√(ae/d) at light engagement
- Redline Tools — Cobalt & HSS drills (p. 340) and coolant-fed solid carbide drills (p. 328): speeds and feeds
- Viking Drill & Tool — Recommended speeds and feeds for HSS drills
- Hertel (MSC) — High speed steel & cobalt drills: speeds and feeds
- YG-1 — HSS & cobalt drill parameters, and Carbide Dream Drills technical information
- Dormer Pramet (Precision Twist Drill) — R10/R15/R18 general purpose jobber drills: AMG speeds and feeds
- Redline Tools — Cobalt & HSS drills: speeds and feeds (catalog p. 340)
- Sandvik Coromant — Drilling formulas and definitions (net power)
- Haas Tooling — Cobalt jobber drills; carbide drills, general purpose (plain and TSC) and Inox (TSC): feeds and speeds
- OSG — Carbide drills, lists 215/220D/200/233, and HY-PRO CARB coolant-through drills: drilling technical
- Walter Titex — Technical compendium, holemaking 2024: cutting data for solid carbide drills
- Ingersoll — WinTwist exchangeable-head drills: operating guidelines (NEW-393-2, pp. 9–10)
- Tru-Edge — Solid carbide drills: feeds and speeds
- YG-1 — Carbide Dream Drills: technical information (speeds, feeds, depth factors)