Royal Master TG-12x4 Servo Cycle
Image: royalmaster.com, Royal Master
Key Specifications
Spindle Power
workpiece diameter range
accuracy
wheel size
regulating wheel size
regulating wheel speed
How much does the Royal Master TG-12x4 Servo Cycle cost?
Price estimate
We do not have a price for the Royal Master TG-12x4 Servo Cycle 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 Servo Cycle is a compact centerless grinder for infeed and thrufeed work on parts from 0.002 in to 1.5 in (0.05 mm to 38 mm) in diameter. It carries a grinding wheel 12 in diameter x 4 in wide (304 mm x 100 mm) and a regulating wheel 6 in diameter x 4 in wide (152 mm x 100 mm), and Royal Master rates its accuracy at 0.00004 in (0.001 mm).
What makes it a Servo Cycle is the ram bed drive. Royal Master couples its standard dovetail and gib ram bed with a ball screw and servo motor, run from a Parker Automation control with a colour touch screen. Infeed cycles are programmed on screen, saved under their own file names and recalled from a library, so a shop that changes parts often doesn't rebuild each setup from notes. The listed screen functions include automatic size compensation and automatic wheel dress with compensation.
The hydraulics are gone. Both wheel dressers have motor cross feed and motor down feed, which is what makes automatic dressing possible; the auto dress feature traces a template for the wheel profile. The regulating wheel is servo driven over 0-500 rpm. Ram bed travel is 2 in (50.8 mm), enough, in Royal Master's words, to allow removal of the grinding wheel. A linear glass scale and the regulating wheel lateral adjust are options, not part of the base machine.
Among the TG-12x4 machines it sits below the TG-12x4 Hi-Accuracy, which Royal Master rates at 0.00002 in (0.0005 mm). Spindle power is 7.5 hp (5.6 kW) with 10 hp (7.5 kW) optional, and the machine weighs 2,500 lb (1,134 kg). The 4 in wheel width is the limit to watch, because an infeed form has to fit inside it. For larger work the TG-12x8 Servo Cycle takes parts to 3.0 in (76 mm) on wheels 8 in wide.
Full Specifications
| Parameter | Value |
|---|---|
| Workpiece Diameter Range | 0.002 in to 1.5 in (0.05 mm to 38 mm) |
| Accuracy | 0.00004 in (0.001 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 | 2,500 lb (1,134 kg) |
| Dressers | Air sensing, permanently mounted, stepping motor traversed with touch screen controls (programmable dual dressing zones standard) |
| Ram Bed Travel | 2 in (50.8 mm) |
| CNC Control | Parker Automation |
Specifications sourced from royalmaster.com — verified 2026-10-05
Strengths & Limitations
Strengths
- Infeed and thrufeed grinding on one machine, across 0.002 in to 1.5 in (0.05 mm to 38 mm) of part diameter
- Ball screw and servo motor ram bed drive with a Parker Automation control; infeed cycles are saved and recalled by file name
- No hydraulics: both wheel dressers use motor cross feed and motor down feed, which allows automatic wheel dress
- Servo driven regulating wheel with a 0-500 rpm range
- Rated accuracy of 0.00004 in (0.001 mm) from a machine that weighs 2,500 lb (1,134 kg)
Limitations
- Rated accuracy is 0.00004 in (0.001 mm); the TG-12x4 Hi-Accuracy is rated at 0.00002 in (0.0005 mm)
- Part diameter stops at 1.5 in (38 mm) and the wheels are 4 in wide, so longer infeed forms need the TG-12x8 Servo Cycle
- The linear glass scale and the regulating wheel lateral adjust are options
- Base spindle power is 7.5 hp (5.6 kW); the 10 hp (7.5 kW) motor is optional
Best For
Frequently Asked Questions
01
Royal Master lists a machine capacity of 0.002 in to 1.5 in (0.05 mm to 38 mm) in diameter, for infeed as well as thrufeed grinding. The grinding wheel is 12 in diameter x 4 in wide (304 mm x 100 mm), so the 4 in width sets how long an infeed form can be.
02
The control system is Parker Automation with a colour touch screen. The ram bed is moved by a ball screw and servo motor, and Royal Master lists programmable infeed cycles that are saved and recalled with their own file names, library storage of infeed cycle parameters, a digital read-out of ram position and expandable I/O for automation.
03
The table lists air sensing, permanently mounted dressers that are stepping motor traversed with touch screen controls, with programmable dual dressing zones as standard. Royal Master states that both wheel dressers have motor cross feed and motor down feed, and that the auto dress feature, where fitted, traces a template for the profile and compensates automatically.
04
Both tables show the same wheel sizes and the same 0.002 in to 1.5 in (0.05 mm to 38 mm) capacity. The Servo Cycle is rated at 0.00004 in (0.001 mm) and weighs 2,500 lb (1,134 kg). The TG-12x4 Hi-Accuracy is rated at 0.00002 in (0.0005 mm) and its table adds sizing increments of 0.000010 in (0.00025 mm).
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