This Okamoto Linear 612B Surface Grinder is a precision hand-feed toolroom grinder built around a 6" x 12" magnetic chuck and a 14.17" x 5.9" working table, with 15.35" of longitudinal travel, 8.27" of cross travel, and a 2 HP spindle that runs an 8" wheel at 3,600 RPM up to 8,000 SFPM surface speed. A 0.0001" vertical handwheel graduation — with the available 0.00005" micro vertical feed option — combined with Okamoto's hand-scraped dual-V linear ball-bearing ways and automatic lubrication lets a toolmaker hold tight tenths on dies, fixtures, gauges, and small production work without giving up the rigidity of a 1,850-lb floor-standing grinder. Compared to older Okamoto 6 x 12 hand-feed surface grinders that relied on plain-V slideways and coarser vertical handwheel graduations, the Linear B Series adds the linear ball-bearing way system, the optional 0.00005" micro vertical feed, and a tighter scrape on the dual-V geometry — upgrades that move this 612 from a competent shop-floor grinder into a true toolroom-grade machine. Pair that with the Grind-X build, the 61" x 55" x 72" footprint, and 230/460V three-phase wiring, and this Linear 612B delivers measurably better repeatability than the earlier non-Linear Okamoto hand-feeds while still fitting in any small toolroom that previously housed a Harig, Boyar-Schultz, or Brown & Sharpe 6 x 12 surface grinder. MakeOkamoto ModelLinear 612B Year2010 or older Product #16947 Price Please login to see price. Make an Offer Get a Quote Share Ask a Question About This Machine Stop hunting for a hand-feed surface grinder that actually holds tenths — this Okamoto Linear 612B brings 0.0001" vertical graduation (with optional 0.00005" micro feed), linear ball-bearing ways, and a 2 HP spindle running an 8" wheel at 3,600 RPM into a single 1,850-lb toolroom-grade package. Plug it in and your shop can grind dies, gauges, and small production parts to repeatable, predictable accuracy the same day, on a Grind-X build that's known to outlast cheaper imports under daily toolroom use. **All descriptions and specifications are preliminary and must be confirmed by buyer prior to purchase.** Live Tooling / Milling Specifications Vertical Table / Pallet Size: 14.17" x 5.9""" X-Travel: 15.35" Y-Travel: 8.27" Spindle Spindle Motor: 2 HP Second Spindle Tool Changer Turret Control Tailstock / Steadyrest Options Product Description: Manual Hand-Feed Surface Grinder Magnetic Chuck Size: 6" x 12" (Nominal) Max Grinding Width: 5.91" Max Grinding Length: 13.78" Spindle Center to Table: 2.95" to 18.31" Max Wheel Size: 8" x 1" x 1-1/4" Bore Wheel Speed: 3,600 RPM Max Surface Speed: 8,000 SFPM Handwheel Feeds Per Rev: Long 5.12", Cross 0.1", Vertical 0.05" Vertical Handwheel Graduation: 0.0001" (Micro Vertical Feed Option: 0.00005") Ways: Linear Ball Bearing, Dual V (Hand-Scraped) Automatic Lubrication Grind-X Line Electrical: 230/460V, 3PH, 60Hz