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Cold Grind??

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  • Cold Grind??

    I just bought this little machine, but I have no clue as to what it really is.
    If anyone has used one or has any leads to info, I'd appreciate hearing about it.

    This pic is the only marking on the top of the main housing, which is cast aluminum.

    Here is a view of the bizness end. The work table is cast iron. The face of the abrasive wheel is 5" in diameter. Scale in the pic is 6" . The wheel is driven by a toothed belt, although the wheel hub is smooth. The motor is reversible by way of the 3 way switch. When running, the abrasive wheel oscillates right to left over a travel equal to the width of the working face of the wheel.

    The side view shows the flat lever that disables the oscillation feature, anf the round "L" shaped lever that adjusts the height of the work table relative to the abrasive wheel.

    This pic of the under side of the work table shows the handle to adjust the angle of the work table. It does not attach directly to the table, though.

    I think it will be useful for finish grinding HSS tool bits, but testing has yet to begin.


  • #2
    It looks like a low speed diamond grinder, the type used on HSS because the speed is low enough so it doesn't cause the carbon from the diamonds to affect the steel.

    Nifty gadget, wish I could find one here at a reasonable price. I believe the wheel is held on with a magnet, makes it quick and easy to swap grits.

    Location: Newtown, CT USA


    • #3
      That's a 'grinder' for diamond lapping carbide tools and inserts. The wheel is held on with magnets.

      Don't use it on steel unless you take steps to clean the wheel afterwards. Won't hurt it but you'll need to wash the muck out of the diamonds.

      I've been trying to get one of those to 'fall' on me for thirty years......

      1973 SB 10K .
      BenchMaster mill.


      • #4
        I have one just like it, with "Enco" on the top instead of "Cold Grind". It is really great for tool grinding, in my limited experience. Slow-speed diamond, good for carbide or HSS.


        • #5
          Thanx for the info guys.
          It didn't fall on me Pete, but you could say I tripped over it!

          How do you go about washing the muck out of the wheel?? It definitely has some!

          I was messing with it on a brazed carbide bit as well as a HSS bit. It puts a real decent finish on either. Neither bit got more than slightly warm to the touch.



          • #6
            It looks like an early version of or a psuedo copy of a Glendo.
            They are very handy to put a realy sharp edge on high speed steel


            • #7
              You really need to grind wet with them. This works a lot like the current Accu-Finish line of tools, and they sell diamond hone fluid on their site ( ) and some cleaning stuff that seems to work well. These diamond hone/grinders will put a wicked sharp edge on your tools and the nicest thing is that you can use them right next to your nice machinery because they are dust free.


              • #8
                The original version was called a Leonard Grind-r-lap.

                I bought one from the guy I bought my 10EE from when I went to pick it up.

                They work nice. Good for carbide or HSS. Wheels are spendy though. Around $150, available in fine and coarse. Too bad I have two fine wheels and no coarse...

                Heres mine:



                • #9
                  To clean the muck, put the wheel in the dishwasher, (when the wife is not looking!) This is a much underappreciated cleaning device that is pretty stoopid; it will clean just about any dirty thing that will fit. The detergent is so alkaline that corrosion of steel is not a problem as long as you dry it fairly soon after washing. Duffy
                  Duffy, Gatineau, Quebec


                  • #10
                    I have always been a bit hesitant about using the dishwasher for anything with abraisive grit. Clothes washers in environments where people put sandy beach clothes in them have a reputation for early failure. Replacing a pump or, worse yet, having to tear it completely apart to replace a main shaft seal would make using another method to clean stuff like that look like far less work.

                    You can always use some dish soap (cuts grease pretty well) and hot water with an old toothbrush. For things that are quite greasy, I have a lot of luck with the mild-caustic degreasers like the Castrol stuff in the purple jug. There are other brands too. While caustics will potentially darken aluminum and they caution you not to use them on aluminum, I find I never have to leave them set long enough to do any real damage. Your (presumably aluminum) diamond wheel hub may not be shiny when done, but it's not real shiny now, either

                    Paul Carpenter
                    Mapleton, IL


                    • #11
                      Originally posted by Duffy

                      To clean the muck, put the wheel in the dishwasher, (when the wife is not looking!)
                      While wandering about on the Accu-Finish site I came across their cleaning instructions:

                      Using a toothbrush and Comet cleanser, a few minutes of scrubbing got the wheel looking pretty good. The next time I make a run to the local tooling joint I'll pick up a dressing stick.

                      The backside of the wheel is marked "STD Finish". By the looks of my test bit, I'm thinking that a finer grit for finish work would be a good investment. However, a new diamond wheel retails for 2X what I paid for the machine! Being a cheep bastage, I'm gonna keep an eye on Ebay.

                      Thanx all for your info!



                      • #12
                        You might want to reconsider that dressing stick. Removing the wheel now and again for a scrub will do it far less harm than a dressing stick.

                        Unless I mis-understand what sort of dressing stick you are referring to?

                        1973 SB 10K .
                        BenchMaster mill.