Hello from Leicester and what have I done wrong

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Hello from Leicester and what have I done wrong

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Viewing 14 posts - 1 through 14 (of 14 total)
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  • #478169
    Andy Shepherdson
    Participant
      @andyshepherdson55441

      Hi everyone, with retirement looming I am setting up a home workshop. I’ve been an engineer since being an apprentice back in the seventies. Just bought a Chester DB8 lathe from a member on here, next is a small mill.

      Anyway the reason for my post is twofold one to say hello the other to ask what have I done wrong or not. Just set the lathe for slow feed and now have a gap between the securing screw and the bottom gear and no room for a spacer.
      Hope you can see what I mean in the photo. Now the next problem how to post a photo ??

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      #40834
      Andy Shepherdson
      Participant
        @andyshepherdson55441
        #478171
        John Haine
        Participant
          @johnhaine32865

          Click on the camera icon at the top of the typing window, then select the photo from your album.

          #478175
          Ed Duffner
          Participant
            @edduffner79357

            Hello Andy,

            I expect you have already done this, but I would double check the gear set up matches the frontpanel info.

            Looking at your photo, you could try swapping the two smallest gears in the cluster. The top-most small gear appears to have a bigger diameter than the middle mounted small gear.

            Ed.

            #478178
            Brian H
            Participant
              @brianh50089

              Hello Andy and welcome. As you can see, a question usually results in answers.

              Hope you can get your problem resolved soon.

              Brian

              #478180
              Andy Shepherdson
              Participant
                @andyshepherdson55441

                8ace04ab-18ee-423d-a41d-44b7e714091a.jpeg

                #478182
                Paul Kemp
                Participant
                  @paulkemp46892

                  Andy,

                  Thats an interesting one, I don't have that particular machine but looking at the photo, could you not reverse the order of the gears on each stud starting from the top to bring the large gear to the end of the lead screw, you would then have room to fit a small gear behind as a spacer (or indeed if you have a spacer – the spacer). Shouldn't change the overall ratio, just the relative positions of the gears if you get my drift?

                  Paul.

                  Doh, cancel the above!  Looks like the position of the first gear on the mandrel is fixed and would need the pulley etc removing!  Also it wouldn't change to relative clearance at the bottom. Sorry.

                  Edited By Paul Kemp on 07/06/2020 12:59:24

                  Edited By Paul Kemp on 07/06/2020 13:02:15

                  #478187
                  Martin Connelly
                  Participant
                    @martinconnelly55370

                    +1 to what Paul suggests. The two small gears are both driving gears and the two large ones are driven gears. As long as you keep the order driver-driven-driver-driven it is just a matter of finding a setup that works, often putting two gears with as near possible sizes together as the combination in the middle works out to be the easiest setup. As Paul says, this puts the largest gear in the final position. The other thing you may have to try is the smallest gear in the first driver position.

                    Martin C

                    #478192
                    Andy Shepherdson
                    Participant
                      @andyshepherdson55441

                      Thanks for the replies, Andy

                      #479003
                      Neil Wyatt
                      Moderator
                        @neilwyatt

                        Welcome to the forum Andy

                        Might be worth you posting under general questions with DB8 in the title to attract the attention of other owners of teh same lathe!

                        Neil

                        #479042
                        JasonB
                        Moderator
                          @jasonb

                          Looks wrong for the fine feed as you don't seem to have the largest gear on the leadscrew. Would have expected something like 80T on the leadscrew and intermediate and 75 meshing with the fixed gear on the spindle then the spacer will fit.

                          Can you post  a photo of the front panel where it shows the gear layout.

                          Edited By JasonB on 11/06/2020 08:04:41

                          #479061
                          Journeyman
                          Participant
                            @journeyman

                            Don't know if it is just a photo effect but it doesn't look like the last gear in the train is actually on the leadscrew! (I'm sure it is though). My WM250 which has pretty much the same system looks like this. Last gear on the leadscrew is 80 tooth for the slowest feed.

                            changegears.jpg

                            The change gear diagram from the cover looks like this for the slow feeds. 'H' indicates a spacer though I have no idea what 'H' stands for.

                            changegear2.jpg

                            John

                            Edit: typo

                            Edited By Journeyman on 11/06/2020 10:36:02

                            #479084
                            Howard Lewis
                            Participant
                              @howardlewis46836

                              Welcome!

                              It may well be worth you joining the local M.E Society, (Google "Model Engineering Society, Leicester" and it will bring up at least two in or near Leicester.

                              It is very likely that someone will have the same lathe as you, and will be able demonstrate, face to face (or socially distanced ) the way to set up the gears for whatever feed rate, or screw thread that you need for a particular job.

                              But don't stop asking questions on here! It will most unusual for no one to know the answer

                              Howard

                              #479371
                              Gibbo568
                              Participant
                                @gibbo568

                                Hello Andy, have a look on Youtube for 'Ade's Workshop'

                                He has produced a very good video about setting up the gear-train on his

                                Warco WM190, which i think is very similar to your Chester lathe

                                He does a very good job of explaining the use of the 'spacers'

                                 

                                Keith

                                sorry forgot to add a link!

                                Edited By Keith Gibson on 12/06/2020 17:20:33

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