Quill Mounted DTI Holder?

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Quill Mounted DTI Holder?

Home Forums Workshop Tools and Tooling Quill Mounted DTI Holder?

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  • #799243
    Bo’sun
    Participant
      @bosun58570

      Hello,

      I have a quill mounted DTI holder bought from ARC some time ago and it works just fine.  However, to establish a reading by nudging a DTI with such limited travel is far from ideal.

      Has anyone come across such a holder with a fine adjust like you get with some of the mag based indicator holders?

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      #799258
      Diogenes
      Participant
        @diogenes

        Yes, there are other designs, mostly with some horizontal rail or rails that the bit that holds the indicator can slide along.

        I have a home-brewed ‘dovetail’ version which is okay-ish, Mitutoyo made a nice one with a pair of round rails (based on a Starrett design maybe?), and Stefan Gotteswinter designed a really useful one – see pdf here;

        https://www.patreon.com/posts/low-profile-dti-90933448

         

         

         

        #799339
        Robin
        Participant
          @robin

          Problem is you need one of those Hogwarts Special milling machines where you can lock the spindle or let it spin free on a whim 🙂

          Robin

          #799409
          Diogenes
          Participant
            @diogenes

            I have a Hog-Warcs Major, one only has to slip the belt… Maybe you should buy the Pinnacle, Robin..?

            #799418
            bernard towers
            Participant
              @bernardtowers37738

              Try graham meeks design

              #799501
              Bo’sun
              Participant
                @bosun58570

                Thank you Bernard.  Any idea where to find it?  I’m assuming in one of his books.

                #799513
                Clive Foster
                Participant
                  @clivefoster55965

                  Noga do a universal adjustment clamp under type number FA1500.

                  https://en-british.desertcart.com/products/19522005-nogafa1500-universal-fine-adjustment-swivel-clamp-for-dial-test-indicators?gad_source=1&gad_campaignid=20572390682&gbraid=0AAAAAoLvBX2rEGOmIHh9d4EMiscL-sTnB&gclid=CjwKCAjw3MXBBhAzEiwA0vLXQcjyH4xeeO-N2iHKbmnI50FzIgcrWY56XUsENBXDaDQZhLkkINQmqhoCfFgQAvD_BwE

                  Expensive but making something similar doesn’t seem too hard. Basically the actual indicator carrier is on a pivot in a forked carrier with a sling loaded screw to adjust it through a few degrees of angle.

                  Clive

                  #799554
                  John Purdy
                  Participant
                    @johnpurdy78347

                    This is what I use, and I find they cover all situations. The DTI has inter-changable stems of different dia. so can be used in the drill chuck or collet whichever is in the mill. The position of the point of either is adjusted with the cross slide and knee as required.

                    John

                    DTI

                    Dial Indicator

                    Indicator Clamp

                    #799804
                    Bo’sun
                    Participant
                      @bosun58570

                      Thanks John.  I’ve tried using a plunger type dial gauge with the quill mounted holder (although mounting it was a bit challenging), hoping the longer travel might help, but it’s too heavy for the holder to support (and a little bulky).  Maybe a smaller dial gauge might be worth a try.

                      #799884
                      John Purdy
                      Participant
                        @johnpurdy78347

                        Bo’sun

                        The quill clamp I use with the dial indicator is from a commercial holder I purchased. When trying to use it I found it was next to useless.
                        It clamped to the quill at three points, two raised parts at 120 degrees apart and a plastic tipped screw opposite them. The two raised parts were not flat but were as cast and the screw had a soft plastic tip.
                        The result was that no matter much the screw was was tightened the whole assembly would wiggle.
                        Also when the dial indicator was attached to the arms it was a real fiddle to get it in a good position and even when it was, the whole assembly was so flexible it couldn’t be relied on to give an accurate reading.

                        So I got rid of all the pieces except the cast quill clamp and made some modifications to it.
                        I replaced the plastic tip on the screw with one made of aluminum, and using a 1″ end mill cleaned up the two cast quill contact points to make them flat (well semi circular) and at 90 degrees to the face of the clamp.
                        I also drilled an extra hole in the body of the clamp to mount a 1/2″ dia steel post that the dial indicator screws to.
                        The result is a holder that is now totally rigid when clamped to the spindle.
                        Hope the pictures make this all clear. The first is the original unit (but with the mods to to clamp body showing) and the other two are the modified clamp.
                        John

                        Indicator Holder

                        Holder Modified

                        Modified Holder

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