Elliot Omnimil

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Elliot Omnimil

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  • #146405
    Mark C
    Participant
      @markc

      head support bracket.jpgwp_000496.jpgwp_000495.jpgwp_000494.jpgI have a couple of Omnimil's and had some problems with the vertical head. It turned out it was down to loose bolts in the end but it lead me to make some modifications to try and improve it. The two main things have been the bearings in the quill – replaced with some taper rollers and a stiffener bracket on the head attached to the over-arm bar.

      elliot vertical quill.jpg

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      #17329
      Mark C
      Participant
        @markc

        Modifications to the Elliot Omnimil

        #146406
        Mark C
        Participant
          @markc

          Ah well, that did not come out how I was expecting! You will get the general idea though…

          Mark

          #146419
          Bazyle
          Participant
            @bazyle

            It came out well enough. I saw the drawing on the yahoo site and was flummoxed as to how it fitted.

            #146430
            Mark C
            Participant
              @markc

              It was not my idea, I saw it on another machine that had a plate bolted to the head and fastened directly to the mast with two bolts in the existing threaded holes for the horizontal spindle. It occurred to me that I could simply use the over-arm as it would allow me to still move the head forward if I needed as I simply lock the over-arm shaft in the new position.

              Mark

              #146432
              Mark C
              Participant
                @markc

                Here are the mods I did for the long slide lead screw nut – inspired by BP millers and a host of other anti-backlash nuts

                juniormil adjustable long feed nut.jpg

                juniormil adjustable long feed nut - sheet 2.jpg

                juniormil adjustable long feed nut - sheet 3.jpg

                juniormil adjustable long feed nut - sheet 4.jpg

                juniormil adjustable long feed nut - sheet 5.jpg

                Don't have any pictures of the actual job but it did look very much like this:

                elliot juniormil feed nut mod 1.jpg

                Edited By Mark C on 08/03/2014 16:06:50

                #147589
                Mark C
                Participant
                  @markc

                  I had to move the head forward last night to get some extra reach and the brace onto the overarm works well but it cannot maintain the head alignment accurately enough. I found that I still needed to slacken the bolt into the overarm and square the head back up as it was off by a couple of thou after I moved it. It was close enough to make the job quick and easy though.

                  Mark

                  #147599
                  IanT
                  Participant
                    @iant

                    Very much admire your work on the anti-backlash nut Mark. Good idea and great execution!

                    Thanks for the drawings and photo, they made things much clearer.

                    (I have a Victoria H0 btw)

                    Regards,

                    IanT

                    #147656
                    Mark C
                    Participant
                      @markc

                      Ian, H0 looks a bit more of a beast than mine! I don't envy you having to wind the table up and down with the fixed vertical head (if you have one) though. I have the universal milling head for my other machine (it does not have the vertical head on top) and using it is a last resort – I would have to put power on the z axis if I did not have the quill feed machine.

                      I am getting fed up winding the long feed as it is – so much so, I have just picked up a small motor, gearbox and inverter to put drive back on the table. When I fitted scales for the DRO they fouled the drive shaft (so it came off) but I am lazy so it is getting an upgrade. It always appears to collect tiny splinters that end up in my hands so hopefully that problem will improve a bit also (perhaps I should fit plastic wheels and see if that is better?).

                      Mark

                      #147682
                      IanT
                      Participant
                        @iant

                        Hallo Mark,

                        The H0 is a very solid bit of kit but even so (at 5ft) one of the smaller horizontal mills around (of the non-bench mounting kind that is). I do have the vertical head and the knee can be heavy but I just take it slow & easy. I find a bigger problem is making very fine adjustments to cutter height, as it's not exactly sensitive (undoubtedly mine also has some wear) and of course you can't drill as there is no quill. However, I have other (smaller) machines, so in the past I've usually been able to work around any problems in practice, even though it can involve more effort on secondary work setting. As this doesn't happen very often, it's not been a problem for me, whereas the large table and heavy build is often a very useful asset to have.

                        I have no DRO's fitted but I have just acquired a small 100mm Vertical Linear Digital Scale (guess from where & how?). I'm thinking of using it as a 'fitting' to help me finesse a bit more accuracy in setting up any finishing cuts. I haven't worked out the detail yet but I think it will be a helpful thing to have and I hope to make it easy/quick to fit (& remove). This will also make it portable and useable on my other machines.

                        The HO has a powered table (as standard) and I do use it, although it can sometimes seem a tad fast on some settings/cuts. I still use hand feed for work where I need more 'feel' for the cut. The powered table is very useful for long steady (multiple) cuts though. My Victoria is very similar to the one at the bottom of this page on "Lathes" ,and my 'Vikky' is probably also long overdue a good clean-up & repaint.

                        **LINK**

                        Regards,

                        IanT

                        #147688
                        Bazyle
                        Participant
                          @bazyle

                          For a heavy knee mill have you considered a pneumatic cylinder under the table set to take off half the weight with constant pressure set up so it compensates as you raise the table.

                          #147697
                          IanT
                          Participant
                            @iant

                            No Bazyle, that's never occurred to me.

                            I did think about some form of counter-springing/weights briefly but it never even reached the "Tuit" list. It got bogged down at the "Pondering" stage. Any reference material on this idea you can point me at?

                            Regards,

                            IanT

                            #147699
                            Clive Hartland
                            Participant
                              @clivehartland94829

                              Baz, are you thinking of a Gas Ram? One could be fitted to assist the movement of the table.

                              Clive

                              #147700
                              Bazyle
                              Participant
                                @bazyle

                                Ian, I don't know if it has been done anywhere. It just occurred to me when reading about someone cutting big gears aned needing to wind up and down hundreds of times. I suppose professionals just get a machine with all powered like the bigger Elliots eg U2.

                                I think some smaller modern mills have been modified with a gas spring to lift the moveable head but that is lighter.

                                #147750
                                IanT
                                Participant
                                  @iant

                                  Ok Bazyle. Thanks.

                                  I already have several large lumps in pieces at the moment, which I'm tending to trip over with predictable regularity. So I'm trying very hard to focus my wandering attention (think butterfly on caffeine) and make some actual progress on just one or two major things. The better weather is helping but it was still a bit nippy down the Shed yesterday. So gas springs are clearly something for the back burner just now.

                                  There's a pleasant thought, as it implies that I must have some kind of "Front" burner! Maybe there's hope for me yet.

                                  wink

                                  IanT

                                  #147775
                                  Bazyle
                                  Participant
                                    @bazyle

                                    Know what you mean about the trip hazards. laugh Just come in from cleaning a less pristine version of the handle in your first photo which must have been a common part. If you ever want to take it apart there really are hidden grub screws 3/4 in long holding in the arms – one hole not tapped in far enough, one not tightened enough anyway,, and the thrird one has raised burrs so I can't unscrew the rod.

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