Royal Master TG-12x8 Hi-Accuracy
Image: royalmaster.com, Royal Master
Key Specifications
Spindle Power
workpiece diameter range
accuracy
sizing increments
wheel size
regulating wheel size
How much does the Royal Master TG-12x8 Hi-Accuracy cost?
Price estimate
We do not have a price for the Royal Master TG-12x8 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-12x8 Hi-Accuracy is the glass-scale version of the wide-wheel centerless grinder: capacity from 0.002 in to 3.0 in (0.05 mm to 76 mm) in diameter, sizing increments of 0.00001 in (0.25 micron), and wheels 8 in wide. Royal Master builds it on a Starrett surface plate granite platform.
The ram is where it departs from the TG-12x8 Servo Cycle, which sizes in 0.00004 in (1 micron) increments. This machine reads ram position from a glass scale and moves on Schneeberger anti friction cross rollerways. The table's accuracy row, though, shows 0.00004 in (0.001 mm), no tighter than the dovetail machine. A buyer comparing the two should ask Royal Master what each is expected to hold on the part in question.
Dressing is the widest choice on the page. Royal Master lists an over the wheel air sensing dresser with stepping motor cross travel, the same dresser with automatic dressing off a template, over the wheel CNC dressing, horizontal CNC dressing of the grinding wheel for a rotary diamond disk or single point, and diamond roll form. The basic system is a two axis machine, so CNC dressing axes are additions.
The grinding wheel is 12 in diameter x 8 in wide (304 mm x 200 mm). Facing it is a regulating wheel 8 in diameter x 8 in wide (200 mm x 200 mm) in a straddle bearing system, servo driven over 0-500 rpm; for cam out work it is programmed to stop while the part is loaded. Spindle power is 10 hp (7.5 kW), with 15 hp (11.2 kW) optional. The HMI is a 17 inch touch screen and the machine weighs 3,800 lb (1,724 kg).
Full Specifications
| Parameter | Value |
|---|---|
| Workpiece Diameter Range | 0.002 in to 3.0 in (0.05 mm to 76 mm) |
| Accuracy | 0.00004 in (0.001 mm) |
| Sizing Increments | 0.00001 in (0.25 micron) |
| Wheel Size | 12 in diameter x 8 in wide (304 mm x 200 mm) |
| Regulating Wheel Size | 8 in diameter x 8 in wide (200 mm x 200 mm) |
| Regulating Wheel Speed | 0-500 rpm (servo driven) |
| Spindle Motor Power | 10 hp (7.5 kW); optional 15 hp (11.2 kW); spindle inverters available |
| Machine Weight | 3,800 lb (1,724 kg) |
| Enclosure Options | Multiple options available depending on customer requirements |
| Dressers | Air sensing, permanently mounted, stepping motor traversed with touch screen controls (programmable dual dressing zones standard); optional automatic dressing using templates |
Specifications sourced from royalmaster.com — verified 2026-10-05
Strengths & Limitations
Strengths
- Sizing increments of 0.00001 in (0.25 micron) from a glass scale and cross rollerway ram
- Takes parts from 0.002 in to 3.0 in (0.05 mm to 76 mm) on wheels 8 in wide
- Granite platform, which Royal Master uses on all TG-12x8 series machines
- Dressing choices extend to over the wheel CNC dressing, horizontal CNC rotary diamond disk dressing and diamond roll form
- Regulating wheel can be programmed to stop during loading for cam out systems
Limitations
- The accuracy row reads 0.00004 in (0.001 mm), the same figure as the TG-12x8 Servo Cycle, so the table alone does not show the gain
- The basic system is two axis; CNC dressing is one of several dresser choices and not part of every machine
- The TG-12x4 Hi-Accuracy is rated tighter in its own table, at 0.00002 in (0.0005 mm), for parts up to 1.5 in (38 mm)
- The 15 hp (11.2 kW) spindle motor is an option over the base 10 hp (7.5 kW)
Best For
Frequently Asked Questions
01
The table lists sizing increments of 0.00001 in (0.25 micron). Royal Master says the ram bed uses a glass scale with Schneeberger anti friction cross rollerways for accurate size compensations. The accuracy row of the same table reads 0.00004 in (0.001 mm).
02
Royal Master lists five for this system: an over the wheel air sensing dresser with standard stepping motor cross travel, the same type with automatic dressing off a template, over the wheel CNC dressing, horizontal CNC dressing of the grinding wheel for a rotary diamond disk or single point, and diamond roll form. They apply to both the grinding and the regulating wheel.
03
Wheel sizes, capacity, spindle power and the 3,800 lb (1,724 kg) weight are the same in both tables. The TG-12x8 Servo Cycle sizes in 0.00004 in (1 micron) increments. The Hi-Accuracy sizes in 0.00001 in (0.25 micron) increments, using a glass scale and cross rollerways, and has a 17 inch touch screen HMI with Windows based programming that is remote accessible.
04
From 0.002 in to 3.0 in (0.05 mm to 76 mm) in diameter. The grinding wheel is 12 in diameter x 8 in wide (304 mm x 200 mm), so several short parts can share the wheel face in an infeed setup, or one long form can use all of it.
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