Enshu Enshu BH100VL
Key Specifications
X Travel
Y Travel
Z Travel
Spindle Taper
Tool Capacity
Rapid Traverse
Overview
The Enshu BH100VL is a specialized vertical machining center that integrates honing function directly into a CNC machining center platform. This unique combination allows cylinder block finish-machining operations — boring, milling, drilling, tapping, and honing — to be performed in a single machine and single setup, eliminating the separate honing machine and inter-operation handling that conventional process flows require. For automotive engine plants, this consolidation of processes directly reduces capital equipment, floor space, and work-in-process inventory.
The BH100VL's Z-axis is driven by a high-powered linear motor, which provides the rapid response and precise motion control that honing operations demand. Linear motor drives eliminate the backlash and compliance inherent in ball screw drives, enabling the controlled reciprocating motion and feed force modulation that honing requires for achieving the bore geometry, surface finish, and crosshatch pattern specifications critical to cylinder bore performance. This is not a conventional VMC with a honing attachment bolted on — the machine is architected from the ground up for integrated honing.
The large internal workspace accommodates various fixtures for multi-product processing, reflecting the reality of modern engine plants that produce multiple engine families on shared equipment. The machine handles the complete range of cylinder block finish operations: rough and finish boring of cylinder bores, water jacket and oil gallery drilling, bolt hole drilling and tapping, and final honing to achieve the bore geometry and surface finish specifications that determine engine oil consumption and ring sealing performance.
For engine manufacturers transitioning from dedicated transfer lines to flexible machining systems, the BH100VL eliminates one of the last holdout standalone processes. Where conventional process flows send blocks through a machining center line and then to a separate honing machine, the BH100VL performs both operations in a single station. This consolidation is particularly valuable for plants producing multiple engine variants in lower volumes where dedicated honing machines for each variant cannot be justified.
Full Specifications
| Parameter | Value |
|---|---|
| Machine Type | Vertical machining center with integrated honing function |
| Z Axis Drive | High-powered linear motor |
| Spindle Taper | BT-40 |
| Spindle Speed | 12,000 RPM |
| Spindle Motor Power | 15 kW (20 hp) |
| X-Axis Travel | 800 mm (31.5 in) |
| Y-Axis Travel | 600 mm (23.6 in) |
| Z-Axis Travel | 500 mm (19.7 in) |
| Rapid Traverse Rate | 60 m/min (2,362 ipm) X/Y, linear motor Z |
| Tool Capacity | 30 tools |
| Max Workpiece Weight | 500 kg (1,102 lb) |
| Honing Capability | Integrated CNC honing with linear motor Z-axis |
| Through Spindle Coolant | Standard, 70 bar (1,015 psi) |
| CNC Control | Fanuc 31i-B5 |
| Machine Weight | Approx. 10,000 kg (22,046 lb) |
Specifications sourced from enshu.co.jp — verified 2026-03-28
Strengths & Limitations
Strengths
- Integrates honing into a CNC machining center, eliminating standalone honing machines and inter-operation handling for cylinder blocks
- Linear motor Z-axis provides the precise reciprocating motion control that honing requires without ball screw backlash
- Single-setup processing of boring, drilling, tapping, and honing reduces work-in-process and total processing time
- Large internal workspace supports multi-product fixturing for plants producing multiple engine families
- Eliminates the capital cost, floor space, and maintenance of a separate dedicated honing machine
- Particularly valuable for mixed-model engine plants where dedicated honing machines per variant cannot be justified
Limitations
- Highly specialized machine with limited application outside cylinder block and similar bore-finishing operations
- Premium pricing reflects the integrated linear motor and honing capability — significantly more than a standard VMC
- Honing cycle times on a machining center may not match dedicated honing machines at the highest production volumes
- Enshu's limited service network outside Japan and select Asian markets complicates support in North America and Europe
Best For
Frequently Asked Questions
01
New Enshu BH100VL machines typically price between $500,000 and $750,000 depending on honing tooling configuration and automation level. The premium over a standard VMC reflects the integrated linear motor Z-axis and honing capability.
02
The BH100VL achieves bore geometry and surface finish specifications suitable for production cylinder blocks, including crosshatch pattern control for oil retention. For the highest-volume applications requiring the absolute tightest bore tolerances, dedicated honing machines may still have an edge.
03
Honing requires precise, backlash-free reciprocating motion with controlled feed force. Linear motors provide this inherently. Ball screw drives have compliance and backlash that compromise honing motion quality. The linear motor enables seamless switching between conventional machining and honing.
04
The BH100VL is a full-capability vertical machining center that performs boring, milling, drilling, tapping, and chamfering in addition to honing. For cylinder blocks, rough boring, finish boring, water jacket drilling, bolt hole drilling and tapping, and final honing can all be completed in a single setup.
