Royal Master TG-12x4 Hi-Accuracy
Key Specifications
Spindle Power
workpiece diameter range
accuracy
sizing increments
wheel size
regulating wheel size
How much does the Royal Master TG-12x4 Hi-Accuracy cost?
Price estimate
We do not have a price for the Royal Master TG-12x4 Hi-Accuracy that we can stand behind, so we show no number. Configuration, options and installation move the final price a long way: a quote is the reliable figure.
Overview
The Royal Master TG-12x4 Hi-Accuracy is the CNC member of the TG-12x4 centerless family, rated at 0.00002 in (0.0005 mm) with sizing increments of 0.000010 in (0.00025 mm). Capacity is 0.002 in to 1.5 in (0.05 mm to 38 mm) in diameter on a grinding wheel 12 in diameter x 4 in wide (304 mm x 100 mm).
Sizing is what separates it from the TG-12x4 Servo Cycle, which is rated at 0.00004 in (0.001 mm). Here the ram bed runs on what Royal Master calls a frictionless cross roller way, moved by a ball screw and servo motor and read by a glass scale. Royal Master recommends the system for extreme close tolerance grinding of multiple diameters and transitions, and for jobs where post process gauging feeds back to the machine.
Configuration varies a great deal, so read a quotation carefully. The basic systems are two axis machines without granite. The BEDROCK series sits on 8-inch thick granite and can be equipped with up to 8 axis of CNC. The weight row shows the difference: 2,800 lb (1,270 kg) non granite, 3,800 lb (1,724 kg) granite. Dresser choices in the table run from the air sensing, stepping motor traversed units to an automatic dressing system, CNC over the wheel and a CNC rotary diamond disk.
The wheel spindles run in class 7 ABEC angular contact ball bearings, with an outboard bearing support for a twin grip design offered as an option. Opposite the grinding wheel is a regulating wheel 6 in diameter x 4 in wide (152 mm x 100 mm), servo driven over 0-500 rpm. Spindle power is 7.5 hp (5.6 kW), or 10 hp (7.5 kW) as an option. Operators work from a 17-inch touch screen, and the Windows based programming is remote accessible for data reports and diagnostics.
Full Specifications
| Parameter | Value |
|---|---|
| Workpiece Diameter Range | 0.002 in to 1.5 in (0.05 mm to 38 mm) |
| Accuracy | 0.00002 in (0.0005 mm) |
| Sizing Increments | 0.000010 in (0.00025 mm) |
| Wheel Size | 12 in diameter x 4 in wide (304 mm x 100 mm) |
| Regulating Wheel Size | 6 in diameter x 4 in wide (152 mm x 100 mm) |
| Regulating Wheel Speed | 0-500 rpm (servo driven) |
| Spindle Motor Power | 7.5 hp (5.6 kW); optional 10 hp (7.5 kW); spindle inverters available |
| Machine Weight | 2,800 lb (1,270 kg) non granite, 3,800 lb (1,724 kg) granite |
| Dressers | Air sensing, permanently mounted, stepping motor traversed with touch screen controls; automatic dressing system; CNC over the wheel; CNC rotary diamond disk |
Specifications sourced from royalmaster.com — verified 2026-10-05
Strengths & Limitations
Strengths
- Rated accuracy of 0.00002 in (0.0005 mm), with sizing increments of 0.000010 in (0.00025 mm)
- Ram bed position control on a cross roller way with ball screw and servo motor movement
- BEDROCK series machines sit on 8-inch thick granite and can be equipped with up to 8 axis of CNC
- Dresser choices include CNC over the wheel and a CNC rotary diamond disk
- 17-inch touch screen HMI with remote accessible, Windows based programming
Limitations
- Part diameter is limited to 1.5 in (38 mm); the TG-12x8 Hi-Accuracy takes parts to 3.0 in (76 mm)
- The basic systems do not use granite and are two axis machines, so the granite bed and the extra CNC axes depend on the configuration ordered
- The outboard bearing support for the wheel spindle is an option
- Wheels are 4 in wide, which caps the length of an infeed form
Best For
Frequently Asked Questions
01
Royal Master's table gives an accuracy of 0.00002 in (0.0005 mm) and sizing increments of 0.000010 in (0.00025 mm). For comparison, the TG-12x4 Servo Cycle is rated at 0.00004 in (0.001 mm) on the same wheel sizes.
02
It depends on the configuration. Royal Master says its basic Hi-Accuracy systems don't use granite, while the BEDROCK series machine sits on 8-inch thick granite with machined coolant troughways. The weight row reflects this: 2,800 lb (1,270 kg) non granite and 3,800 lb (1,724 kg) granite.
03
The basic system is a two axis machine. Royal Master states that the BEDROCK series can be equipped with up to 8 axis of CNC, and the dresser row of the table lists CNC over the wheel and CNC rotary diamond disk dressing among the choices. Ask which axes a given quotation includes.
04
The grinding wheel is 12 in diameter x 4 in wide (304 mm x 100 mm) and the regulating wheel 6 in diameter x 4 in wide (152 mm x 100 mm), servo driven at 0-500 rpm. Spindle power is 7.5 hp (5.6 kW) with 10 hp (7.5 kW) optional, and spindle inverters are available.
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