Machine Comparison
Mitsui Seiki J6CN vs Mitsui Seiki J7CN
Mitsui Seiki vs Mitsui Seiki · CNC Boring Machines
Summary
The Mitsui Seiki J6CN and the Mitsui Seiki J7CN are two sizes of precision boring machine with the same published spindle and accuracy figures: a 40 to 3,200 rpm spindle with an ISO no. 45 taper, 5,080 mm/min. (200 ipm) rapid traverse, 300 mm (11.81") of Z travel, ±0.001 mm (0.00004") positioning accuracy and ±0.0005 mm repeatability. The difference is the size of work each one takes.
The Mitsui Seiki J7CN travels 1,530 mm (60.23") in X and 1,020 mm (40.15") in Y against 1,020 mm (40.15") and 760 mm (29.92"), on a 1,830 x 1,200 mm table against 1,280 x 960 mm. It carries 2,000 kg (4,400 lbs) against 1,200 kg (2,645 lbs). The Mitsui Seiki J6CN is the lighter machine at 9,000 kgs (19,800 lbs) against 14,000 kg (30,800 lb.). The J6CN runs a Fanuc 30iM-B control, the J7CN a FANUC 30i-B-Plus with Panel iH Pro.
Specifications Comparison
| Specification | Mitsui Seiki J6CN | Mitsui Seiki J7CN |
|---|---|---|
| X-Axis Travel | 1,020 mm (40.15") | 1,530 mm (60.23") ▲ |
| Y-Axis Travel | 760 mm (29.92") | 1,020 mm (40.15") ▲ |
| Z-Axis Travel | 300 mm (11.81") | 300 mm (11.81") |
| Table Size | 1,280 X 960 mm (50.39" x 37.79") | 1,830 x 1,200 mm (72.04" x 47.24") |
| Max Table / Workpiece Load | 1,200 kg (2,645 lbs) | 2,000 kg (4,400 lbs) ▲ |
| Max Spindle Speed | 40~ 3200 RPM | 40~ 3200 RPM |
| Spindle Power | AC 10 kW (7 hp) | AC 10 kW (7 hp) |
| Spindle Taper / Nose | ISO no. 45 NT (Cat 45 -opt) (opt. 50 Taper) | ISO no. 45 NT (Cat 45 -opt) (opt. 50 Taper) |
| Tool Capacity | Option: 20ATC; 60ATC | Option: 20ATC; 60ATC |
| Rapid Traverse | 5,080 mm/min. (200 ipm) | 5,080 mm/min. (200 ipm) |
| Positioning Accuracy | ± 0.001 mm (0.00004") | ± 0.001 mm (0.00004") |
| Repeatability | ± 0.0005 mm (0.00002") | ± 0.0005 mm (0.00002") |
| Control | Fanuc 30iM-B | FANUC 30i-B-Plus with Panel iH Pro |
| Machine Weight | 9,000 kgs (19,800 lbs) | 14,000 kg (30,800 lb.) |
Advantages
Mitsui Seiki J6CN
- Lighter machine: 9,000 kgs (19,800 lbs) against 14,000 kg (30,800 lb.)
- Gives the same ±0.001 mm (0.00004") positioning accuracy in the smaller size, with a 1,280 x 960 mm table rather than 1,830 x 1,200 mm
Mitsui Seiki J7CN
- 1,530 mm (60.23") of X travel against 1,020 mm (40.15")
- 1,020 mm (40.15") of Y travel against 760 mm (29.92")
- 2,000 kg (4,400 lbs) workpiece load against 1,200 kg (2,645 lbs)
- 1,830 x 1,200 mm (72.04" x 47.24") table against 1,280 x 960 mm
Verdict
Choose by part size alone, because the spindle, rapid traverse and accuracy figures are the same. The Mitsui Seiki J6CN covers bore patterns within 1,020 mm (40.15") by 760 mm (29.92") on parts up to 1,200 kg (2,645 lbs), in a 9,000 kgs machine. The Mitsui Seiki J7CN is for larger plates and housings that need 1,530 mm (60.23") of X, 1,020 mm of Y or a load up to 2,000 kg (4,400 lbs).