This Mitsui 250MH Surface Grinder is a precision Japanese toolroom grinder paired with an integrated Unison DedTru centerless grinding attachment, giving one machine two distinct precision-finishing capabilities. As a surface grinder it pairs an 8" x 18" magnetic chuck and an 8" x 19" working table with 20" of longitudinal travel, 10" of cross travel, and a 1-1/3 HP spindle that runs a 7" x 1/2" wheel up to 4,000 RPM, with 0.0001" vertical-feed and 0.001" crossfeed handwheel graduations riding on linear ball-bearing ways for repeatable tenths-level work on dies, fixtures, gauges, and small production parts. Compared to standalone Mitsui 250-series surface grinders without the centerless attachment, this configuration unlocks an entire second category of work: with the DedTru fixture mounted in place, the same machine handles thrufeed, infeed, and plunge centerless grinding on cylindrical parts from 1/4" to 1-1/4" (up to 5" with special tooling), covering headed pins, splined shafts, formed parts, stepped diameters, tapers, and chamfers. That makes this 250MH dramatically more flexible than the average era-correct Japanese toolroom surface grinder, and it routinely replaces two machines in a small shop — a flat-grinder and a centerless grinder — on a footprint smaller than most stand-alone centerless machines. MakeMitsui Model250MH Year2010 or older Product #16948 Price Please login to see price. Make an Offer Get a Quote Share Ask a Question About This Machine Stop running two precision finishing machines when one will do — this Mitsui 250MH brings an 8" x 18" chuck surface grinder plus a factory Unison DedTru centerless grinding attachment into a single Japanese-built toolroom package, giving you 0.0001" vertical-feed flat work and 1/4" to 5" centerless capacity on the same footprint. Drop it on the floor and your shop can flat-grind dies and gauges in the morning, then swap to thrufeed centerless work on pins, dowels, and splined shafts in the afternoon. **All descriptions and specifications are preliminary and must be confirmed by buyer prior to purchase.** Live Tooling / Milling Specifications Vertical Table / Pallet Size: 8" x 19""" X-Travel: 20.00" Y-Travel: 10.00" Spindle Spindle Motor: 1.33 HP Second Spindle Tool Changer Turret Control Tailstock / Steadyrest Options Product Description: Manual Surface Grinder Magnetic Chuck / Grinding Capacity: 8" x 18" Table Movement: 20" (Longitudinal) x 10" (Cross) Spindle Center to Table: 20" Grinding Wheel Size: 7" x 1/2" x 1-1/4" Bore (180 x 13 x 31.75 mm) Spindle Speed: Up to 4,000 RPM Crossfeed Handwheel: 0.001" Graduated, 0.100" Per Rev Vertical Feed Handwheel: 0.0001" Graduated, 0.0500" Per Rev Ways: Linear Ball Bearing DedTru (Unison) Centerless Grinding Attachment Mounted DedTru Operations: Thrufeed, Infeed, Plunge Centerless Grinding DedTru Part Diameter Range: 1/4" to 1-1/4" DedTru Applications: Cylindrical, Headed, Splined, Geared, Formed Parts, Steps, Tapers, Chamfers