Machine Comparison
Star Micronics SR-10J vs Star Micronics SR-20JII Type A/B
Star Micronics vs Star Micronics · Swiss-Type Lathes
Summary
The Star Micronics SR-10J and Star Micronics SR-20JII Type A/B are both from Star Micronics's swiss-type lathes lineup, making this a common upgrade or lineup decision for shops already invested in the Star Micronics ecosystem. The Star Micronics SR-20JII Type A/B shows specification advantages in 7 categories, though the Star Micronics SR-10J may still be the better choice depending on your shop's specific needs and the type of work you run. Both machines are proven performers in production environments and represent solid investments for shops in the market for a swiss-type lathe.
Specifications Comparison
| Specification | Star Micronics SR-10J | Star Micronics SR-20JII Type A/B |
|---|---|---|
| Control | FANUC 32i-B | FANUC 32i-B |
| Max Machining Diameter | 10 mm (25/64 in) | 20 mm (25/32 in), optional 23 mm (29/32 in) ▲ |
| Main Spindle Speed | 15,000 RPM ▲ | 10,000 RPM |
| Main Spindle Power | 2.2 kW continuous / 3.7 kW (15 min, 60% ED) | 2.2 kW continuous / 3.7 kW (10 min, 25% ED) |
| Sub Spindle Speed | 10,000 RPM | 10,000 RPM |
| Sub Spindle Power | 0.55 kW continuous / 1.1 kW (15 min, 50% ED) | 2.2 kW continuous / 3.7 kW (10 min, 25% ED) ▲ |
| Sleeve Holder | 4-spindle (front 4 / rear 4 tools) | 5-spindle (front 5 / rear 5 tools) ▲ |
| Rapid Feed Rate | 35 m/min | 35 m/min (X1, X2, Z1, Z2), 24 m/min (Y2) |
| Power Consumption | 3.1 kVA | 4.8 kVA ▲ |
| Coolant Tank | 89 L | 202 L ▲ |
| Machine Weight | 1,400 kg (3,086 lb) | 2,750 kg (6,063 lb) ▲ |
| Dimensions | 1,865 x 775 x 1,695 mm | 2,250 x 1,200 x 1,700 mm ▲ |
| Price Range | $80,000 - $130,000 ▲ | $150,000 - $250,000 |
Advantages
Star Micronics SR-10J
- Superior main spindle speed at 15,000 RPM vs 10,000 RPM
- More competitive pricing at $80,000 - $130,000 compared to $150,000 - $250,000
- Backed by Star Micronics's dealer and service network for parts and support
- Medical device manufacturers producing micro screws, dental pins, hearing aid components, and micro-implant hardware under 10mm diameter
Star Micronics SR-20JII Type A/B
- Superior max machining diameter at 20 mm (25/32 in), optional 23 mm (29/32 in) vs 10 mm (25/64 in)
- Superior sub spindle power at 2.2 kW continuous / 3.7 kW (10 min, 25% ED) vs 0.55 kW continuous / 1.1 kW (15 min, 50% ED)
- Superior sleeve holder at 5-spindle (front 5 / rear 5 tools) vs 4-spindle (front 4 / rear 4 tools)
- Superior power consumption at 4.8 kVA vs 3.1 kVA
- Superior coolant tank at 202 L vs 89 L
Verdict
The Star Micronics SR-20JII Type A/B edges ahead on specifications in this comparison, particularly in max machining diameter and sub spindle power. However, the Star Micronics SR-10J remains competitive and may be the better choice depending on price, dealer support in your area, or specific workholding and tooling considerations. Both are capable machines — the best decision comes from running your actual parts and evaluating total cost of ownership including tooling, training, and service.