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Mounting grinding wheels/stones to a taper shafted tool post grinder

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  • Mounting grinding wheels/stones to a taper shafted tool post grinder

    I have a small tool post grinder with a tapered shaft for ID grinding. How does one properly mount a grinding stone. If a stone slips, it grinds into the tapered spindle, BTDT. Are there special tapered ID stones? Could I make an aluminum tapered bore sleeve and then bond the sleeve into a larger ID stone? The TPG has a second spindle asm for external grinding where the stone/blotter is pushed against a flange and a nut/washer on the opposite side of the stone/blotter.

    Click image for larger version

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    Metro Detroit

  • #2
    Heat up some pitch?

    Comment


    • #3
      Are you certain that is not a removable arbor? In some cases the entire length may be removable and replaceable.

      it also may be a replaceable quill assembly, in which case you do not have the one for straight shaft / normal wheels.

      You might make a tapered ID adapter to fit, with the OD to suit your wheel. The taper might turn out to be something do-able, like same as a taper pin, for which there are reamers.
      Last edited by J Tiers; 12-29-2020, 12:54 AM.
      4357 2773 5150 9120 9135 8645 1007 1190 2133 9120 5942

      Keep eye on ball.
      Hashim Khan

      Everything not impossible is compulsory

      "There's no pleasing these serpents"......Lewis Carroll

      Comment


      • #4
        It would be nice to see some more details, like the other end of the shaft and the name plate on the grinder.
        Paul A.
        SE Texas

        And if you look REAL close at an analog signal,
        You will find that it has discrete steps.

        Comment


        • #5
          Originally posted by aribert View Post
          I have a small tool post grinder with a tapered shaft for ID grinding. How does one properly mount a grinding stone. If a stone slips, it grinds into the tapered spindle, BTDT....
          You need a washer between the back of the stone and the spindle extension.
          What is BTDT? Some partisan code?
          DZER

          Comment


          • #6
            I guess been there done that, a bit cryptic. I was going to respond WKOGIIAHITESM (what kind of grinder is it and how is the existing stone mounted, spelled out for those not hip enough )
            Last edited by Mcgyver; 12-29-2020, 10:43 AM.
            in Toronto Ontario - where are you?

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            • #7
              I would see whether that spindle extension is removable. Pushing the stones up the taper is a sure way to make mini grenades.

              Comment


              • #8
                BTDT is Been There, Done That.

                The arbor is surely removable, I would just make some new ones with a nut. These are a couple from my toolpost grinder.

                Click image for larger version

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                • #9
                  Yep, that is the usual form.

                  I have also seen forms that go right through a hollow shaft, and have a nut at the back. Both types have a taper to seat them in the shaft.
                  4357 2773 5150 9120 9135 8645 1007 1190 2133 9120 5942

                  Keep eye on ball.
                  Hashim Khan

                  Everything not impossible is compulsory

                  "There's no pleasing these serpents"......Lewis Carroll

                  Comment


                  • #10
                    Originally posted by johansen View Post
                    Heat up some pitch?
                    Or better yet, read the manual for your grinder.

                    Comment


                    • #11
                      Originally posted by reggie_obe View Post

                      Or better yet, read the manual for your grinder.
                      Probably never got one. Most of my equipment never came with one, I got a few of them from other sources.
                      4357 2773 5150 9120 9135 8645 1007 1190 2133 9120 5942

                      Keep eye on ball.
                      Hashim Khan

                      Everything not impossible is compulsory

                      "There's no pleasing these serpents"......Lewis Carroll

                      Comment


                      • #12
                        Originally posted by Paul Alciatore View Post
                        It would be nice to see some more details, like the other end of the shaft and the name plate on the grinder.
                        Paul:

                        Two TPGs (Tool Post Grinders, spelled out for Doozer). First one is a no name with a Kenmore sewing machine motor. I'm guessing it may have been a kit aimed at hobbyist decades ago. The second TPG is a small Dumore. Both have the tapered spindle for internal grinding.
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                        Metro Detroit

                        Comment


                        • #13
                          Originally posted by reggie_obe View Post

                          Or better yet, read the manual for your grinder.

                          I'm a bottom feeder, most of my tools were bought used, the TPG with the sewing machine motor was bought on eBay shortly after Al Gore finished inventing the internet. Not likely to find a manual for something that has no name brand on it.
                          Metro Detroit

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                          • #14
                            I'm pretty sure that the taper is for clearance, and not for mounting a stone on.

                            You should have a couple of small flanges that fit on the screw, as shown in the bottom piece below:

                            Comment


                            • #15
                              Ah, you DO have two quills for the one, so it is not just a removable "insert" as per the other pic. I'd say you need a different pulley for the other quill, as it is for a larger and therefore slower wheel. The mount for that one sorta reminds me of Dumore also, actually more so than the actual Dumore does.... looks a lot like mine, other than having a replaceable quill. Similar to the series 57, only looks smaller.

                              If it were a 57, there would be a couple insert spindle attachments like what Andywander shows, for the internal spindle

                              I do not know what the nominal speed for that sewing machine motor is, but if you do, you can figure the pulley sizes to remain under the max unloaded wheel speeds. My Series 44 has 5 various pulleys to cover a range of allowable speeds for external and internal grinding, depending on wheel size, between 6600 and 38500 rpm.


                              Last edited by J Tiers; 12-29-2020, 11:39 PM.
                              4357 2773 5150 9120 9135 8645 1007 1190 2133 9120 5942

                              Keep eye on ball.
                              Hashim Khan

                              Everything not impossible is compulsory

                              "There's no pleasing these serpents"......Lewis Carroll

                              Comment

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