RPM for 0.5" Titanium — Cutting Speed
When machining Titanium with a 0.5-inch diameter tool, the recommended spindle speed range is 611–1222 RPM, calculated from a surface speed of 80–160 SFM for carbide tooling. Selecting the correct RPM ensures optimal tool life and surface finish quality. Use this reference alongside your feeds and speeds calculator to set up new operations with confidence.
Recommended Cutting Parameters
| Material | Titanium |
| Tool Diameter | 0.5" |
| Recommended SFM Range | 80–160 SFM |
| Recommended RPM Range | 611–1222 RPM |
Why These Parameters Matter
Running below the minimum SFM causes built-up edge (BUE) and poor surface finish on Titanium; exceeding the maximum accelerates tool wear and risks thermal damage to the workpiece and coating. Staying within the 80–160 SFM range for a 0.5-inch tool balances productivity with tool life. These values assume sharp carbide tooling in good condition. Dull tools, poor fixturing, or interrupted cuts may require reducing speed by 20–30% from the recommended range. Depth of cut and radial engagement also influence optimal SFM — lighter finishing passes can tolerate the upper end of the range while full-width roughing passes benefit from the lower end.
Compare Materials — 0.5" Diameter
| Material | RPM (min) | RPM (max) |
|---|---|---|
| Aluminum | 4584 | 7639 |
| Mild Steel | 1146 | 1910 |
| Hardened Steel | 535 | 917 |
| Stainless Steel | 764 | 1375 |
| Titanium (current) | 611 | 1222 |
| Cast Iron | 1528 | 3056 |
| Brass | 2292 | 3820 |
| Plastic | 3056 | 6112 |
Machining Tips for This Combination
Titanium (Grade 2 commercial, Grade 5 Ti-6Al-4V) is unforgiving — climb-milling is mandatory, flood coolant is non-negotiable, and SFM stays in the 50–100 range. Use sharp uncoated carbide (coatings can react chemically with titanium at the cutting interface) and peck drill deep holes to evacuate hot chips. Titanium chips ignite below visible-spark size and burn at temperatures water will not extinguish — keep a Class D fire extinguisher within arm's reach and clear chip accumulation between every operation.
Medium-diameter tools (0.5 to 1.0 inch) are the general-purpose sweet spot — the most versatile range for slotting, profiling, facing, and pocketing in hobby shops and production environments. A 2-flute carbide endmill in this range handles aluminum well; 3-flute is the right finishing choice; 4-flute earns its keep in steel and stainless where chip clearance is less critical. Chip load runs 0.003–0.005 inch per tooth across most materials. Standard ER32 and ER40 collet setups grip the full length of the shank for adequate rigidity in conventional applications.
Machining Tips
Use sharp, coated carbide tooling rated for Titanium. Apply appropriate coolant: flood coolant for steel and stainless, air blast or MQL for aluminum to prevent chip re-cutting. Verify spindle runout (< 0.0002") before production runs. Reduce feed per tooth by 20–30% for the first pass when breaking surface scale on hot-rolled stock. Always consult your tooling manufacturer's recommended parameters as a primary reference and use these values as a cross-check. Monitor chip color and size during the first cut — blue chips or dust-like chips indicate the speed or feed needs adjustment.