JTEKT e-420H
Key Specifications
Spindle Taper
grinding type
max swing
distance between centers
z axis guideway
x axis drive
Overview
The JTEKT e-420H is a CNC cylindrical grinding machine from JTEKT (formerly Toyoda), designed for high-precision OD, ID, and face grinding of shaft-type workpieces. JTEKT is one of the world's largest grinding machine manufacturers, and the e-series represents their current-generation platform with enhanced energy efficiency and precision.
The e-420H handles workpieces up to 420 mm (16.5 in) swing and approximately 500 mm (19.7 in) between centers. The grinding wheel spindle delivers high-speed capability for both conventional and superabrasive (CBN) wheels. The machine supports multiple grinding methods including plunge, traverse, angular, and taper grinding.
The hydrostatic guideway system on the Z-axis provides frictionless, wear-free motion critical for achieving sub-micron surface finishes and roundness. The X-axis uses precision ball screws with backlash compensation. The wheelhead can be configured with multiple spindles for internal and external grinding without re-setup.
JTEKT's TOYOPUC control provides intuitive grinding cycle programming with built-in routines for common grinding patterns. The control includes in-process gauging integration for automatic size compensation and thermal displacement correction.
New JTEKT e-420H machines price $250,000-$400,000 depending on configuration. Competes with Studer S33, Kellenberger 100, and Okuma GP-47N in the mid-size cylindrical grinding segment.
Full Specifications
| Parameter | Value |
|---|---|
| Grinding Type | CNC cylindrical (OD, ID, face) |
| Max Swing | 420 mm (16.5 in) |
| Distance Between Centers | 500 mm (19.7 in) |
| Z Axis Guideway | Hydrostatic |
| X Axis Drive | Precision ball screw with backlash compensation |
| Wheel Spindle | High-speed for conventional and CBN wheels |
| Grinding Methods | Plunge, traverse, angular, taper |
| Wheelhead Config | Multi-spindle option (OD + ID) |
| In Process Gauging | Yes, with automatic size compensation |
| Thermal Compensation | Active thermal displacement correction |
| CNC Control | JTEKT TOYOPUC |
| Machine Weight | 5,000 kg (11,023 lb) approx. |
| Joined | Aug 15, 2011 |
| Messages | 6,918 |
| Likes | 7,861 |
| Manufacturer | OPS |
| Model | H.Plus 405 |
| Power Requirement | 112 kW |
| Spindle Taper | BT 40 |
Specifications sourced from machinio.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Hydrostatic Z-axis guideway provides frictionless motion for sub-micron surface finishes and roundness
- Multi-spindle wheelhead enables OD and ID grinding without re-setup
- In-process gauging with automatic size compensation maintains tolerances without operator intervention
- JTEKT's deep grinding expertise from decades as Toyoda delivers proven process capability
- Active thermal compensation maintains accuracy through long production runs
- Supports both conventional and CBN superabrasive wheels for flexible process optimization
Limitations
- JTEKT's cylindrical grinder market share in North America is smaller than Studer, limiting local expertise
- $250,000-$400,000 is a significant investment for shops that grind infrequently
- TOYOPUC control has a learning curve for operators familiar with other CNC platforms
- Hydrostatic guideways require clean, temperature-controlled hydraulic systems for optimal performance
- 420 mm swing limits workpiece size -- larger shafts need bigger platform
Best For
Frequently Asked Questions
01
$250,000-$400,000 new depending on wheelhead configuration, gauging, and automation. Used (2017-2023) $100,000-$225,000.
02
Oil-film bearing that eliminates metal-to-metal contact, providing frictionless, wear-free motion. Delivers the smoothest possible axis movement critical for grinding surface finish and roundness.
03
Yes. The spindle supports both conventional (aluminum oxide) and superabrasive (CBN) wheels. CBN provides dramatically longer wheel life and enables higher material removal rates on hardened steels.
04
Roundness under 0.5 microns, surface finish under Ra 0.1 microns, and diameter tolerances under +/- 2.5 microns are achievable with in-process gauging and proper setup.
05
Both are premium cylindrical grinders. Studer has stronger brand recognition and larger installed base in North America. JTEKT offers comparable precision at sometimes lower pricing. Studer uses StuderWIN software which many operators prefer.
Videos
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Links to community discussions. Summaries are editorial — visit the original thread for full context.
