ER40 square collets

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ER40 square collets

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  • #293220
    John Haine
    Participant
      @johnhaine32865

      Does anyone know if there is a supplier for ER40 collets to take square material please?

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      #18480
      John Haine
      Participant
        @johnhaine32865
        #293225
        Jon Gibbs
        Participant
          @jongibbs59756

          I've never seen square ER collets but this might help – although admittedly it requires a lot more work… **LINK**

          HTH

          Jon

          #293233
          JasonB
          Moderator
            @jasonb

            If you are lucky square stock can be held in a standard ER collet, I have done it a few times with no provlem, just holds the work by the corners so no heavy cuts.

            #293240
            David Standing 1
            Participant
              @davidstanding1

              What shank is your ER40 collet holder?

              #293251
              John Haine
              Participant
                @johnhaine32865

                Jason, thanks for that! Wanted to face off and drill the end of some 16mm brass square, corners fitted nicely into the slots of a 22mm collet, job done!

                David, not sure why it's interesting, but it isn't a shank it just fits on the Super 7 spindle nose.

                #293256
                Vic
                Participant
                  @vic

                  Interesting point. I've used square stock in my ER32 chuck but which is best, locate the corners of the stock in the slots of the collet or between the slots? smiley

                  Edited By Vic on 13/04/2017 17:54:47

                  #293257
                  Michael Gilligan
                  Participant
                    @michaelgilligan61133
                    Posted by Vic on 13/04/2017 17:53:53:

                    Interesting point. I've used square stock in my ER32 chuck but which is best, locate the corners of the stock in the slots of the collet or between the slots? smiley

                    .

                    dont know

                    Given that ER collets are slotted 'out of phase' at each end … I suspect that whichever way you try to do it, it will end up 'half & half' [so the choice is really whether the front or back end is better in the slots].

                    MichaelG.

                    #293266
                    JasonB
                    Moderator
                      @jasonb

                      Also depends on how many slots the collet has, some have 6 each end, some have 8 each end./

                      If you set the corners about 1/4 of the space from the front slots they won't touch the back slots either on an 8 slotter, easier to do on larger sizes than small.

                      #293267
                      John Haine
                      Participant
                        @johnhaine32865

                        Whatever, it worked very well.

                        #293269
                        MW
                        Participant
                          @mw27036

                          I would've thought that with the square collets you aren't able to use or assume that you'll get the same big size range as an ER40 collet would give you with round stock.

                          #293270
                          JasonB
                          Moderator
                            @jasonb

                            Same with all collets such as 5C square ones you will always be limited to the across corners dimension so ER40 would only go upto about 18mm square which is 26mm across corners

                            #293275
                            Nick Hulme
                            Participant
                              @nickhulme30114

                              ER collets also work very nicely on shallow angle tapers 😀

                              #293277
                              Neil Lickfold
                              Participant
                                @neillickfold44316

                                Not sure if they were made by some one or a purchased item, but we used to have a segmented piece held by 2 wire clips. The segments allowed you to hold a square bar in a collet and went up to 3/4" square. The smallest was like 3/16 or so. They were all imperial. it was just 4 cord segments retained with a wire clip at each end and used in the collet chuck.

                                Neil

                                #293293
                                David Standing 1
                                Participant
                                  @davidstanding1
                                  Posted by John Haine on 13/04/2017 17:14:50:

                                  David, not sure why it's interesting, but it isn't a shank it just fits on the Super 7 spindle nose.

                                  I asked because you can get a square section holding 5c collet plus a cnc collet holding bushing with a parallel shank, but unfortunately the bushing is too big to go in an ER32 collet.

                                  #293445
                                  mechman48
                                  Participant
                                    @mechman48

                                    I have just used my ER25 collet set to hold a piece of 1/4" square brass to machine the fork end for the eccentric rod fitting for my S50 yesterday, it held it in the slots quite securely & didn't need any centering, the 7BA tapping hole was bang on centre, so I would have any hesitation in using this method again ( Have used the 16 mm collet in the same manner for a large 5/8 " hexagonal bar ).

                                    One thing to be aware of; some collets have the diameter size that only goes 1/2 way along the inside of the collet then opens out to a larger dia. ( clearance ) so if you need to machine a tiny piece then you need to put a same diameter offcut in the back of the collet to even out the clamping forces, or may be a larger dia. to fill the back of the collet otherwise you will clamp unevenly & possibly have the small piece come flying out of the collet or even damaging the collet, worth bearing in mind.

                                    George.

                                    #293471
                                    mick
                                    Participant
                                      @mick65121

                                      A self centring four jaw would be a better option, there are some decent and inexpensive ones out there, mines a Tos which I've had for about six years and use all the time, in fact the only time I use a three jaw these days is to hold hexagonal stock.

                                      #293496
                                      Howard Lewis
                                      Participant
                                        @howardlewis46836

                                        AS far as I know, ER collets are only produced to hold round workpieces.

                                        Unless I am mistaken, was'n there an article some time ago on making a set of parts to hold square material in a round ER collet?

                                        ER40 should be large enough to accomodate "adaptors" of various sizes.

                                        Howard

                                        #293509
                                        Flying Fifer
                                        Participant
                                          @flyingfifer

                                          Howard,

                                          You are correct, there was an article in MEW a few yearsago. I made 4 sets to suit differing sizes of square bar and found them very handy on numerous occassions. I`ll see if I can find the source reference as I should have it somewhere.

                                          Alan

                                          #293550
                                          JasonB
                                          Moderator
                                            @jasonb

                                            See the link in the second post, most likely the article was by Harold.

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