Bridgeport Machine Rebuilders

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Harig & Mitsui Surface Grinder Rebuilding Division

Harig 612 surface grinderOver the past 30 years, Harig/Mitsui Surface Grinder Rebuilders, a Division STK Rebuilders, Inc. has rebuilt well over 1,200 surface grinders, ranging from Harig, Mitsui, Okamoto, Boyar-Schultz, Brown & Sharpe, and many other surface grinders. Our service department prides itself with the vast knowledge and expertise to efficiently solve your problems in a cost effective manner.

Precision hand scraping is what gives Harig and Mitsui surface grinders a distinctive feel.  Our Surface Grinder Rebuilding Division hand scrapes bearing surfaces on all the mating surfaces of the iron. This provides a customized surface to surface fit.

All ways are hand scraped and/or reground to original tolerances, set by Mitsui and Harig Products.

The lubrication system is the most important component of the way surfaces. At times the lube system will be overlooked and for lack of a better word, neglected. We focus on this important part of the machine to ensure a longer life for the Mitsui machine rebuild.

As you can see, all Mitsui and Harig surface grinders are a candidate for a machine rebuild. Both Mitsui and Harig have produced a quality machine for many years, knowingly or unknowingly setting the stage for machine rebuilders as a competitor.

Our surface grinder rebuilding service can and will produce a surface grinder comparable to a new Mitsui or Harig surface grinder, for 50-60% of the cost of a new machine. Our process will return your surface grinder to it's original condition, with a 1-year warranty. 

A very brief summary of our machine rebuild process:           

  • Dismantle, clean, and inspect machine tool
  • All components are available for customer's inspection
  • Precision Hand Scrape, flake, and fit all quoted way surfaces to full bearing, assuring longer life of all necessary components
  • Regrind ball ways
  • Replace ball bearings in tracks
  • Replace crossfeed screw & nut assembly
  • Rebuild spindle
  • Inspect electrical system
  • Polish all bright work
  • Professionally painted
  • Inspect oil system
  • Assemble and realign to original tolerance
  • Machine guaranteed for a period of 1 Year, under normal use and proper maintenance

Rebuilt Mills for Sale

We sell Rebuilt Bridgeport Mills for approximately 50-60% of a new Bridgeport mill

We also offer an opportunity to trade-in your well used Bridgeport mill with a purchase of a rebuilt Bridgeport mill. Our rebuilt machines are guaranteed for a period of 1 Year, under normal use and proper maintenance.

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