Machine Comparison
Roku-Roku HC-658 vs Roku-Roku HC-878
Roku-Roku vs Roku-Roku · Vertical Machining Centers
Summary
The Roku-Roku HC-658 and Roku-Roku HC-878 are both from Roku-Roku's vertical machining centers lineup, making this a common upgrade or lineup decision for shops already invested in the Roku-Roku ecosystem. The Roku-Roku HC-878 leads in x travel (800 mm (31.5 in) vs 650 mm (25.6 in)). The Roku-Roku HC-878 shows specification advantages in 9 categories, though the Roku-Roku HC-658 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 vertical machining center.
Specifications Comparison
| Specification | Roku-Roku HC-658 | Roku-Roku HC-878 |
|---|---|---|
| X-Axis Travel | 650 mm (25.6 in) | 800 mm (31.5 in) ▲ |
| Y-Axis Travel | 500 mm (19.7 in) | 700 mm (27.6 in) ▲ |
| Z-Axis Travel | 350 mm (13.8 in) | 400 mm (15.7 in) ▲ |
| Table Size | 800 x 500 mm (31.5 x 19.7 in) | 900 x 750 mm (35.4 x 29.5 in) ▲ |
| Accuracy | +/-2.0 um | +/-0.002 mm (+/-0.00008 in) ▲ |
| Repeatability | +/-1.0 um | +/-0.001 mm (+/-0.00004 in) ▲ |
| Control | Fanuc 31i-B5 with AICC-2 | Fanuc 31i-B5 |
| Max Table Load | 500 kg (1,102 lb) | 800 kg (1,764 lb) ▲ |
| Spindle Speed | 30,000 rpm (40,000 rpm optional) | 30,000 RPM (direct-drive) |
| Spindle Taper | HSK-E40 | HSK-E40 |
| Machine Weight | 5,500 kg (12,125 lb) | 7,500 kg (16,535 lb) ▲ |
| Price Range | $250,000 - $400,000 | $180,000 - $280,000 ▲ |
Advantages
Roku-Roku HC-658
- Backed by Roku-Roku's dealer and service network for parts and support
- Mold shops machining graphite electrodes for sinker EDM operations, particularly complex 3D shapes and fine-detail electrodes
Roku-Roku HC-878
- Greater x travel of 800 mm (31.5 in) accommodates larger workpieces
- Greater y travel of 700 mm (27.6 in) accommodates larger workpieces
- Greater z travel of 400 mm (15.7 in) accommodates larger workpieces
- Superior table size at 900 x 750 mm (35.4 x 29.5 in) vs 800 x 500 mm (31.5 x 19.7 in)
- Tighter positioning accuracy at +/-0.002 mm (+/-0.00008 in) for precision-critical work
Verdict
The Roku-Roku HC-878 edges ahead on specifications in this comparison, particularly in X Travel and Y Travel. However, the Roku-Roku HC-658 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.