Machining Speeds & Feeds Card
One page. Speeds, chip load and drill feed, imperial and metric.
$3.99
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Machining RPM, feed rate, chip load, and surface speed — mill, drill, turn, tap
Machining
Complete Machining Speeds & Feeds Guide
27 pages. Milling, drilling, tapping, turning and CNC routing.
$12.99
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Machining Job Estimator
Quote shop work and check operations against your spindle's top speed.
Excel or Google Sheets. Best on a computer.
$29.00
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Machining Complete Bundle
Card, 27-page guide and the estimator workbook. All six files.
Excel or Google Sheets. Best on a computer.
$34.99
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Shop tools for machining setup and workflow
Accessory picks for measuring, handling, and preparing stock before cutting operations.
Starrett Digital Caliper
- Verify cutter diameter and stock sizing
- Confirm setup dimensions before cuts
- Useful for repeatable machining QC
DEWALT 4.5 in Angle Grinder
- Fast deburring after machining passes
- Clean edges before weld or assembly
- Useful in mixed fab and machine shops
Leather Work Gloves
- Protect hands when handling sharp stock
- Better grip while setting fixtures
- Useful for hot chip cleanup work
DIYMAG 350 lb Lifting Magnet
- Move steel stock safely at the machine
- Reduce awkward hand handling risk
- Helps organize material staging
Heavy Duty Shop Storage Rack
- Store tools and stock by project
- Keep setup gear organized and dry
- Improves repeatable shop workflow
Understanding Cutting Speed and Feed Rate
Cutting speed and feed rate drive tool life, finish quality, and cycle time. This calculator outputs starter values for spindle speed, feed rate, chip load, and surface speed so you can tune quickly on the machine.
Core formulas used
- RPM = (SFM x 12) / (pi x tool diameter)
- Feed Rate = Chip Load x Flutes x RPM
- Custom SFM override is supported when shop standards differ.
Practical guidance
Start with the calculated values, make a short test cut, and adjust based on chip shape, finish, spindle load, and heat. Consistent chips and stable sound generally indicate healthy parameters.
Material Surface Speed Reference
| Material | HSS Milling (SFM) | Carbide Milling (SFM) | Drilling (SFM) | Turning (SFM) |
|---|---|---|---|---|
| Mild Steel (1018-1045) | 80-100 | 250-350 | 80-100 | 100-150 |
| Stainless 304 | 60-80 | 150-200 | 50-80 | 80-120 |
| Stainless 316 | 50-70 | 120-180 | 40-70 | 60-100 |
| Aluminum | 150-200 | 400-600 | 100-200 | 200-400 |
| Brass | 120-150 | 300-400 | 120-150 | 150-250 |
| Cast Iron | 50-80 | 150-250 | 50-70 | 60-100 |
| Titanium (Ti-6Al-4V) | 30-50 | 100-150 | 30-50 | 50-80 |
| Tool Steel | 60-80 | 180-250 | 60-80 | 80-120 |
When Calculated SFM Still Fails — Diagnose or Pick Tooling
Tool burn-up, chatter, built-up edge, chip color vs calculator, or RPM beyond machine max: Cutting Speed Troubleshooting. Carbide vs HSS (speed capability & machine match): Carbide vs HSS Tooling.
FAQ and Related Calculators
Why do carbide values run much faster than HSS?
Carbide tolerates higher heat and maintains edge hardness at higher cutting speeds, enabling faster SFM and feed rates on rigid setups.
What if my chips turn to dust?
Dust-like chips usually indicate rubbing. Increase feed per tooth or reduce RPM to restore positive chip formation.