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  • #221098
    Clive Hartland
    Participant
      @clivehartland94829

      I have some EMCO I/C tool holders and I want to get longer screws for adjusting the height of the block.

      The screw is a Hex/skt grub screw. and has the following measurements which I cannot match to anything in my ref. books.

      Dia. Imp. 0.193

      Met. 4.91

      Thread TPI matches UNF at 32 Tpi.

      can anyone help identify this thread?

      Clive

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      #24324
      Clive Hartland
      Participant
        @clivehartland94829
        #221099
        Jeff Dayman
        Participant
          @jeffdayman43397

          Sounds like #10-32 UNF might work, but .193" is on the large side of #10 OD spec. JD

          #221101
          Jon Gibbs
          Participant
            @jongibbs59756

            It looks so suspiciously close to M5 (Coarse) x 0.8 = 31.75 TPI I'd be tempted to try that to see whether it fits.

            Jon

            #221102
            Clive Hartland
            Participant
              @clivehartland94829

              Tried an M5 plug tap in the hole and no joy as the pitch is wrong. If I cannot find what it is I might tap it M5 and go from there as all I want to do is increase the length to give more adjustment as at the moment it holds only on the last 2 or 3 threads at the height I want.

              I have UNF taps and dies but they do not fit either.

              Clive

              #221103
              Nigel McBurney 1
              Participant
                @nigelmcburney1

                The toolholder is only hanging on by 2 or 3 threads,by doing this over a period has the thread in the in the holder been stretched or deformed? I would tap a M5 hole in an odd piece of steel and try the screw in it,though of course the screw could also be deformed, similar problems occur with the thread on Tee nuts and studs on milling machines

                #221104
                roy entwistle
                Participant
                  @royentwistle24699

                  2BA ?

                  #221110
                  JasonB
                  Moderator
                    @jasonb

                    When I had an Emco the tool retaining screws were M5 x 0.8, can't really see it being anything other than metric as its Austrian.

                    Whats the machine ? have you asked on the Emco Yahoo user group?

                    Edited By JasonB on 14/01/2016 17:23:42

                    #221111
                    Neil Wyatt
                    Moderator
                      @neilwyatt

                      +1 for 2BA we stole BA from those alpine types

                      Neil

                      #221118
                      Emgee
                      Participant
                        @emgee

                        Clive

                        I have an Emco toolblock and holders but I don't recognise the number you quote, all of the toolholders I have use M8x.8 setscrews for tool height adjustment and tool locking in the holder.

                        I can load a picture if you want but they are on my w/shop computer and I'm in the warm !!!!

                        Emgee

                        #221121
                        John Haine
                        Participant
                          @johnhaine32865

                          Emcee do you mean M5x.8?

                          #221122
                          JasonB
                          Moderator
                            @jasonb

                            Silly question but is it a genuine Emco toolholder, a copy of an Emco one or just a generic toolholder that happens to fit this size machine?

                            #221125
                            daveb
                            Participant
                              @daveb17630

                              Use a bit of care if you plan to tap the toolholders, I had to replace the height studs on some Dickson holders, very hard indeed! I made a D bit from a solid carbide drill shank to drill out the broken tap.

                              #221136
                              Emgee
                              Participant
                                @emgee
                                Posted by Emgee on 14/01/2016 18:04:20:

                                Clive

                                I have an Emco toolblock and holders but I don't recognise the number you quote, all of the toolholders I have use M8x.8 setscrews for tool height adjustment and tool locking in the holder.

                                Thread is M5x0.8, sorry for the error.

                                Emgee

                                #221140
                                Clive Hartland
                                Participant
                                  @clivehartland94829

                                  An interesting study so far, I know it is a genuine EMCO tool holder and tool holders as I removed it from an EMCO Maximat11 lathe and fitted a Schaublin type tool holder in it's place.

                                  I have some fine thread metric taps and will check tomorrow to see if any match but the dia. being less than 5mm threw me a bit, not sure about 2BA it seems a bit course TPI. Also none of the Metric blades match when held against the thread but the 32 UNC blade does perfectly. But the tables of UNF do not match size wise and thats why I am checking here now to see if anyone knows different.

                                  Agreed it is an Austrian make and I really cannot see why they would use an odd size thread at all. But then, who knows?

                                  It may be something like the threads on rifle sights that match nothing I know of. I will report back again later.

                                  Clive

                                  #221145
                                  Neil Wyatt
                                  Moderator
                                    @neilwyatt

                                    Does it appear to be a 60 degree thread? You must have some serious magnifying kit with your background!

                                    Neil

                                    #221150
                                    Michael Gilligan
                                    Participant
                                      @michaelgilligan61133
                                      Posted by Clive Hartland on 14/01/2016 20:57:05:

                                      … the dia. being less than 5mm threw me a bit, not sure about 2BA it seems a bit course TPI. Also none of the Metric blades match when held against the thread but the 32 UNC blade does perfectly.

                                      .

                                      Clive,

                                      I'm inclined to agree with Neil's latest advice.

                                      • Many commercial Metric screws are a little undersize on diameter.
                                      • The difference between 31.75 tpi and 32 tpi is pretty difficult to see.
                                      • BUT the difference between 60° thread-form and 47.5° should be easy.

                                      MichaelG.

                                      #221166
                                      Emgee
                                      Participant
                                        @emgee

                                        Clive

                                        My toolholders are Emco 5 size with M5x0.8 screws and take max 13mm sq tools, so your holders may be somewhat larger from the bigger lathe.

                                        Emgee

                                        #221168
                                        JasonB
                                        Moderator
                                          @jasonb

                                          Clive definately ask on the yahoo group its is for the larger Maximat, V10, V11, etc size machines

                                          #221172
                                          Michael Gilligan
                                          Participant
                                            @michaelgilligan61133
                                            Posted by Clive Hartland on 14/01/2016 16:44:14:

                                            Tried an M5 plug tap in the hole and no joy …

                                            .

                                            Clive,

                                            Just a note of caution [Teaching Granny to suck eggs ?]

                                            As you will see from the excellent diagram and notes here; It is possible to have a 'within spec' Tap which does not freely fit an existing 'within spec' female thread. … The Devil is in the detail [that little white 'optional' area at the top of the diagram].

                                            Assuming that it's an M5 x 0.8 Tap … Have you tried using it as a thread gauge, laid against the grubscrew?

                                            MichaelG.

                                            .

                                            Edit: [a useful Quote from the Wikipedia text; with my added emboldening] … "Conversely, in an internal (female) thread (e.g., in a nut), the major and minor diameters are minimum dimensions, therefore the thread profile must end flat at Dmin but may be rounded out beyond Dmaj."

                                            Edited By Michael Gilligan on 15/01/2016 09:48:58

                                            #221188
                                            Clive Hartland
                                            Participant
                                              @clivehartland94829

                                              OK, panic over as the 5 x 0.8 die runs the thread fine.

                                              Thank you for your interest and thoughts.

                                              Clive

                                              #221899
                                              Clive Hartland
                                              Participant
                                                @clivehartland94829

                                                Today I received 10 M5 x 30 mm long skt grubscrews and proceeded to fit them to the EMCO toolholders to allow more height adjustment, surprise as I removed the original screws to find a smaller g/screw in the hole for adjusting the height ! The new screws gave me the height I wanted by screwing the 5mm grub screws down to the bottom and then putting the new longer ones in on top. All is well now and I am able to set the heights and fix them.

                                                Clive

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