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Mitsui Grinder Rebuilding & Repair


Restore your Mitsui Grinder to its original factory specifications! Our comprehensive services include complete restoration and repair options for your mill, from hand scraping and head rebuilding to table grinding, painting, attachments, and more. Trust us to bring your mill back to life with precision and accuracy that meets or exceeds factory tolerances.

1/3 the price of a new machine!

Our rebuild process includes : 

  • Inspecting machine and all parts

  • Full disassembly and cleaning

  • Grinding hardened steel table ways

  • Hand scraping, flaking, and mastering of all slide ways

  • Repair or replacement of wearable parts as needed

  • Painting + waxing entire machine

  • Polishing and cleaning of all hardware

  • Assembly to factory standards

  • Spindle rebuilding available on request

Our Mitsui Grinder rebuilds include hand scraping and polishing all components
Rebuild your machines to like new for a fraction the cost!

Signs of Wear

Mitsui Surface grinders have been one of the best surface grinders on the market since their debut to the American market in the mid 1970s. Most shops made the switch from Harig grinders to Mitsui grinders as they offer a much smoother experience for operators. They do have a few indicators when it's time for a rebuild such as:

1. Spindle noise/Vibration

Noise and vibration are the clearest signs of worn spindle bearings, you will also notice a poor surface finish or the wheel "skipping" across the part surface.

2. Cross feed screw backlash

Backlash in your cross feed screw should be within 3-5 thousandths from the factory. Backlash in excess of 10 thousandths is generally where we recommend a rebuild, as this usually occurs around the same time the ways have worn out.

3. Uneven grinding

These surface grinders are capable of holding some incredible tolerances, but over time the ways will wear in the most commonly used area of the working space. Most machines will have the center of the carriage ways worn significantly as this is where the majority of work is completed. Over time a low spot will develop and you will notice the part grinding harder in one direction than the other, even when attempting to remove the same amount of material. 

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