Help wanted solving groove for O ring cutting on lathe

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Help wanted solving groove for O ring cutting on lathe

Home Forums Help and Assistance! (Offered or Wanted) Help wanted solving groove for O ring cutting on lathe

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  • #32830
    Christine Walker
    Participant
      @christinewalker32747
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      #266938
      Christine Walker
      Participant
        @christinewalker32747

        Hello

        This is my first time posting here. I have a problem which I can't, for the life of me see a way around.

        In a nutshell, I need to cut a 5mm groove to fit an o ring seal in to the circumference of a 190mm dia workpiece (the piece is Engineering PVC).

        However, the cross-slide on the CJ0623B lathe won't swing out far enough to use a 'straight' cutting tool.

        Therefore, I need a kind of right angle too. Please see the attached diagram to se the problem.

        Can anyone advise what kind of tool I could purchase that might do the job, please?

        Thanks

        #266998
        peak4
        Participant
          @peak4

          If you do a search for double ended boring bar, you will likely see images like this **LINK**

          I'd probably make one something similar, but with round holes and use a bit of round tool steel rather than a square length of HSS. Use the straight rather than the angled hole.

          Just grind your profile on the end; I guess an ideal candidate for the toolbit would be an old centre drill.

           

          Welcome to the forum.

          smiley

          Regards

          Bill

          Edited By peak4 on 17/11/2016 16:33:36

          #267003
          Les Jones 1
          Participant
            @lesjones1

            Is it not possible to turn the top slide (Compound slide.) so that is pointing to the front. I.E the handle will be at the back of the lathe. you may have to remove the handle and find another way to turn it.

            Les.

            #267015
            Les Jones 1
            Participant
              @lesjones1

              I have just realised I have made a wrong assumption. I was thinking that the groove was in the face of the work piece. If the groove was close to the end of the work piece you may be able to angle the top slide so that it let you get the tool tip to the larger diameter and also to the left of the cross slide to enable you to cut the groove.

              Les.

              #267021
              Neil Wyatt
              Moderator
                @neilwyatt

                A boring bar fitted to the back of the toolpost is how I would do it. One with an inserted cutter from 1/8" HSS would be ideal and easy to grind to shape.

                You can do the same to skim large flywheels.

                Neil

                #267022
                Neil Wyatt
                Moderator
                  @neilwyatt

                  P.S. welcome to the forum.

                  #267023
                  Sam Longley 1
                  Participant
                    @samlongley1

                    So how does one view the attachment because i cannot see it !!!???

                    #267024
                    Anonymous
                      Posted by Neil Wyatt on 17/11/2016 18:22:01:

                      You can do the same to skim large flywheels.

                      Like this, using a boring bar with the cross slide fully back:

                      flywheel_rim.jpg

                      Andrew

                      #267034
                      Frances IoM
                      Participant
                        @francesiom58905

                        “So how does one view the attachment because i cannot see it !!!???”
                        you can’t it’s only local to his computer and visible only to his web-kit based browser – yet another probably confused by the arcane image uploading of this web site

                        #267084
                        Christine Walker
                        Participant
                          @christinewalker32747

                          Hello all

                          Thanks for taking the time to reply and welcoming me to the forum.

                          Unfortunately, I don't think I have explained the problem well. The groove for the O Ring has to be around the outer perimeter of the circular workpiece, a little like a pulley wheel type thing. Does that make sense? Imagine two locomotive wheels stuck face to face and you get the idea? Sorry, I can't think of any other way of explaining.

                          I have a diagram which shows the problem perfectly, but for the life of me, I cannot find a way to post it. I click on the image icon and it asks me for a URL which I don't have as it's on my desktop not in photo bucket or similar. Ditto when I click on the camera.

                          Any advice on how to post the image would also be most gratefully received.

                          PS: I am female

                          #267089
                          Circlip
                          Participant
                            @circlip

                            Sounds like a hook tool is required.

                            Regards Ian.

                            #267091
                            Christine Walker
                            Participant
                              @christinewalker32747
                              #267093
                              Hopper
                              Participant
                                @hopper
                                Posted by Christine Walker on 18/11/2016 09:26:55:

                                Any advice on how to post the image would also be most gratefully received.

                                PS: I am female

                                Easiest way is to put the image up in Photobucket or similar. It's free and easy. Then when you click the image icon on here, copy and paste the "DIRECT" link in where it says URL.

                                #267094
                                Christine Walker
                                Participant
                                  @christinewalker32747

                                  Done that but just get a question mark? See if this works

                                  #267095
                                  Emgee
                                  Participant
                                    @emgee

                                    Hi Christine

                                    Simplest way to upload a pic is save your sketch/drawing as a jpeg file, you can then upload it to an Album.

                                    Do this from the top line Menu, click on Albums and follow hints, when writing your message click on the camera "Insert image from Album" and follow menu.

                                    Emgee

                                    #267096
                                    Hopper
                                    Participant
                                      @hopper

                                      Here you go

                                      No need for special tools or counter-rotation. A common boring bar will do the job. One with a removeable HSS bit will allow you to grind it to a nice square profile to make the shape groove you show.

                                      #267097
                                      HOWARDT
                                      Participant
                                        @howardt

                                        For those that can't see the pictures. I assume it is this way for most, they don't appear in email notifications, you have to use the forum (not necessary to log in).

                                        #267098
                                        Christine Walker
                                        Participant
                                          @christinewalker32747

                                          It's in photobucket now. However, when I copy the URL and try and put it in this forum's uploader, it just tells me the image source is missing. Never experienced this before.

                                          #267099
                                          Christine Walker
                                          Participant
                                            @christinewalker32747

                                            Thank you Hopper.

                                            #267100
                                            Hopper
                                            Participant
                                              @hopper

                                              YOu would need a boring bar like this one, with a piece of HSS in the square hole at the lefthand end.

                                              I's sure ArcEurotrade or other advertisers from this site can supply such a beast. You can get them do hold different sizes of HSS square bits, depending on what size groove you wish to turn.

                                              Edited By Hopper on 18/11/2016 10:00:27

                                              #267101
                                              Christine Walker
                                              Participant
                                                @christinewalker32747

                                                Ok, thank you Hopper, I am on it.

                                                #267103
                                                Hopper
                                                Participant
                                                  @hopper

                                                  You're welcome. Good luck with the project.

                                                  #267107
                                                  Neil Lickfold
                                                  Participant
                                                    @neillickfold44316

                                                    I'am not sure of your experience in cutting plastics. But if you go too fast you will melt the material to the tool. Sometimes it is best to use a narrower tool that is sharp and with the final corner radius detail. For a 5mm section O ring the groove will be about 5.5 mm wide and about 9.3 mm deep on diameter. A tool made that is about 2mm wide and about 5 mm out at that width will work well. When the tool gets too wide, it creates a lot of chatter on the work piece etc.

                                                    Neil

                                                    #267110
                                                    Brian Oldford
                                                    Participant
                                                      @brianoldford70365

                                                      Please keep us informed on the progress of your project. Good luck.

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