lost drive to power feed

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lost drive to power feed

Home Forums Help and Assistance! (Offered or Wanted) lost drive to power feed

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  • #513057
    Mark Guy
    Participant
      @markguy26995

      Hi All.

      Ive had collision with the stop on the power feed and lost drive and was wondering if there was shear pin I've missed.

      The motor and the change gears drive fine but there is no drive to the leads screw. I did have a quick look last night but was unable to get the drive box off so i removed the handle and the end cap casting on the right side of the bed but was unable to remove the collar or incremental dial( i thought it may be on a keyway). I didn't want to force it as i can till use the mill at the minute without power feed. Any advise or pictures of the parts brake down would be much appriciated.

      Regards

      Scud

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      #33748
      Mark Guy
      Participant
        @markguy26995

        Beaver mk1 VRBP milling machine

        #513058
        Emgee
        Participant
          @emgee

          Scud

          Is there an overload reset button on the power feed controller ?
          If so perhaps it needs resetting.

          Emgee

          #513063
          Dave Halford
          Participant
            @davehalford22513

            Is the clutch operating properly?

            Can you feel a notchyness in manual mode?

            #513066
            Nick Hughes
            Participant
              @nickhughes97026

              If the motor's not running, rather than mechanically not driving and it's fitted with a Limit switch on the bed, then the plunger on this can stick in, if pushed too hard by the stop fitted on the table.

               

               

              Edited By Nick Hughes on 12/12/2020 12:16:30

              #513068
              Mark Guy
              Participant
                @markguy26995

                can't feel any knotchyness but when I've removed the change gear cover all is turning fine in there but when i look up in the bottom of the bed the gear that drives the lead screw is not turning but the shuttle lever works ok for left to right and from what i can see appears to shuttle ok. It does look like the drive gear may have dropped?? but not sure if that is just the top of an intermediate gear and should be clear of the lead screw

                #513070
                Mark Guy
                Participant
                  @markguy26995

                  Nick

                  The motor runs fine so do the change gears but i have no drive between the drive gearbox and the leadscrew on the bed

                  #513085
                  DC31k
                  Participant
                    @dc31k

                    You might have to post a few pictures for better replies.

                    How closely does the Mark 1 power feed and dial arrangement resemble the Mark 2 that is pictured in full exploded diagram form in the manual?

                    #513087
                    Clive Foster
                    Participant
                      @clivefoster55965

                      Quick and dirty test is to try and back drive the leadscrew. Best if there is a nut on the end but if not suitable soft packing and parallel grip pliers or similar to get a hold on it should suffice.

                      If the screw turns relatively freely it will, in conjunction with similar observations of the gear train, help you narrow down where the drive has been lost.

                      Shear pins or similar weak links like Myfords Tufnol gears are normal in feed drive trains.

                      Sometimes designers get too clever by half.

                      Most annoying one I ever saw was a shallow plastic key between gear and shaft instead of aproper metal one. Pretty much unfindable wiithout the book or a full strip.

                      Clive

                      #513136
                      Mark Guy
                      Participant
                        @markguy26995

                        I will have a look again tomorrow and get a few pictures to try and show what is happening. But could really do with a exploded view to see how it all works

                        #513162
                        DC31k
                        Participant
                          @dc31k
                          Posted by Mark Guy on 12/12/2020 17:23:58:

                          But could really do with a exploded view to see how it all works…

                          The Beaver manual is available online, for free, in many places. If you want a printed copy of the same information, you can buy one from the lathes.co.uk website.

                          The manual would be a good place to start: if you post the link from which you obtain your own copy, then when you tell us "I need to remove item number 7 from page 32 of the manual" we can all literally be on the same page.

                          Even if the manual does not cover exactly your set up, it will be close due to the family relationship between machines.

                          #513202
                          Mark Guy
                          Participant
                            @markguy26995

                            I’ve had a good look on the net tonight but unable to find a free manual/ parts book to view. I will try again tomorrow

                            #513214
                            DC31k
                            Participant
                              @dc31k

                              OK. I have just checked. The manual links (which actually appear on this very forum – you would have found them if you had read through all the Beaver-related stuff here to see if that related to your issue) have expired.

                              Send me a private message with your email address and I will email one to you.

                              #513712
                              Mark Guy
                              Participant
                                @markguy26995

                                Dc31k I did send a PM Did you not received it

                                #513713
                                Mark Guy
                                Participant
                                  @markguy26995

                                  621d4f59-0907-4bed-b883-d7bd5177efea.jpeg

                                  #513714
                                  Mark Guy
                                  Participant
                                    @markguy26995

                                    043dd37d-2479-4602-96ab-09d4711716c6.jpeg

                                    #513715
                                    Mark Guy
                                    Participant
                                      @markguy26995

                                      e68a3ef6-cf56-4d9b-aef3-5da122dad99e.jpege68a3ef6-cf56-4d9b-aef3-5da122dad99e.jpeg

                                      #513716
                                      Mark Guy
                                      Participant
                                        @markguy26995

                                        6c66f875-9f73-40e1-919c-06b6ac3435e9.jpeg

                                        #514551
                                        Mark Guy
                                        Participant
                                          @markguy26995

                                          346f4a14-4c5a-414e-b329-516c1e781993.jpegHi all well after a good few hours stripping the mill gear box assy down, I’ve found the problem and it’s not good see photos. My next question is where may I locate these 2 stripped gears.

                                          #514553
                                          Mark Guy
                                          Participant
                                            @markguy26995

                                            b2a3b1e9-eeef-401c-96cc-cd70a6b9495e.jpeg

                                            #514560
                                            Mark Guy
                                            Participant
                                              @markguy26995

                                              These are the 2 gears required now removed from the boxe0172d94-9d13-42e7-bb11-1a4843100b94.jpeg

                                              #514567
                                              DC31k
                                              Participant
                                                @dc31k

                                                You need to tell us the outside diameter and number of teeth on each gear.

                                                Do the two gears only ever mesh with each other?

                                                The centre distance between their two shafts would also help.

                                                The bigger one looks like it is integral with another one. What diameter is the plain bit between the two?

                                                Have a look at how the worm gear on the drive motor is attached to its spindle. This is supposed to be the weak point such that it slips if there is a bind up.

                                                #514576
                                                john fletcher 1
                                                Participant
                                                  @johnfletcher1

                                                  For replacement gears have look in HPC gears of Chesterfield and or DAVAL in Hatfield Hertfordshire catalogues both have a large range of gears. John

                                                  #514592
                                                  Mark Guy
                                                  Participant
                                                    @markguy26995

                                                    The larger gear is 2.164 with 42teeth and the smaller would have been had it had teeth 1.055 with 21teeth. yes the 2 sheared gears only mesh with each other. The shaft centers would be difficult to measure as the are on different housings. But a I’ve calculated they would 1.500.

                                                    #514593
                                                    Mark Guy
                                                    Participant
                                                      @markguy26995

                                                      I have ran in to another problem now whilst trying to reassemble the bed without the power feed. And that is the woodruff key in the outer shaft drive will not line back up with the key way in the lead screw and I can’t seam to turn them independently for some reason. I would have thought they would only be as one when the dog clutch was engaged on the power feed

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