THRUFEED CENTERLESS GRINDER
12x4
Thrufeed Microsize
Thrufeed grinding. Micron diameter control. Compact footprint.
The Thrufeed Microsize delivers micron-level diameter control in the smallest possible footprint. Nothing fancy, just an accurate, versitle, properly-sized centerless grinder.
30″ X 54″
FLOOR SPACE
.002″ TO 1.5″
DIAMETER CAPACITY
.000,04″
MICRON DIAMETER COMPENSATIONS VIA PULSE GENERATOR
12″x4″
DIAMETER X 4″ WIDE GRINDING WHEEL, 6″ DIAMETER REGULATING WHEEL
• ORIGINAL SERIES
THE STORY BEHIND THE PART
Every part we grind at the show has a story behind it. The 12×4 Thrufeed Microsize is grinding the slide throttle valve from a 1986 Honda ATC 250R carburetor — the holy grail of vintage three-wheelers. A small diameter part, very tight tolerances, and a machine built to hold them. Watch the full story behind the part.
THE SOLUTION FOR YOUR CHALLENGE
SOMETIMES THE RIGHT MACHINE JUST WORKS
IT DOES THE JOB
You need accurate thrufeed grinding in a medium-sized package.
At 30″ x 54″, this machine fits where many other grinders don’t. Sub-micron accuracy in a compact, easy-to-use package.
Your materials vary.
This machine handles all materials and diameters up to 1.5″. Grind everything from plastic to all varieties of steels. In addition, this machine has the capability to grind carbide, ceramics and PCD.
You don’t want to pay for complexity you won’t use.
A clean, accurate thru-feed grinder perfect for the applications presented to it.
TECHNICAL SPECS
BUILT TO A DIFFERENT STANDARD
WHEEL SIZE
12″x4″
12″x4″ diameter grinding wheel, 6″ diameter regulating wheel
SUPER ABRASIVE READY
Variable Frequency Drive
Optional VFD on grinding wheel spindle for super abrasives or maintaining constant surface footage when grinding
RAM BED TRAVEL
2″
2″ of ram bed travel allowing for removal of grinding wheel
DIAMETER POSITIONING
.000,04″
Operator uses a pulse generator for diameter positioning while referencing a glass scale and digital readout.
WHAT SETS IT APART
THE HIGHLIGHTS
30" x 54" Footprint — Smallest in the Royal Master Lineup
Fits in floor space where larger machines can’t go. No compromises on accuracy.
Micron Diameter Compensations via Pulse Generator
Precise size adjustments in 1 micron increments. Consistent diameter control across every run.
.002" to 1.5" Diameter Capacity
Covers a wide range of parts without tooling changes or machine swaps.
12" x 4" Grinding Wheel / 6" Regulating Wheel
Standard geometry optimized for thrufeed applications across all common materials.
No Hydraulics — All Servo Driven Axis Including Dressers
Clean, consistent, and responsive. No warm-up time waiting for hydraulic systems to stabilize.
Straightforward Setup and Operation
Designed for operators who need to run parts, not manage complexity. Easy to set up, easy to run.
ENGINEER
DEEP DIVE
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