Some beginner questions regarding knurling tools

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Some beginner questions regarding knurling tools

Home Forums Beginners questions Some beginner questions regarding knurling tools

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  • #9285
    Sherlock
    Participant
      @sherlock
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      #365889
      Sherlock
      Participant
        @sherlock

         

        Hi guys, sorry for another thread. There is so much I don't know, yet trying to get my head round, despite searching for the answers myself.

        So I am looking for a knurling tool for my Cowells ME90, The manufacturer sells their own single wheel type with 6mm shank that fit their tool holders.

        I have also seen these double wheel types on eBay that I thought might be a bit better and cheaper, but they have a 10mm shank which is too big for the tool holders I own.

         

        Do I buy that and try file the shank down a few mm? (if my files can handle that type of steel?)

        Buy a tool holder that accepts slightly larger tooling? If I can I even do that, are all the dovetails on those tool posts universal and interchangeable?

        Just buy a single wheel type from Cowells?

         

        or something else?

        Not really in a position to make my own just yet which I assume will be a good option down the road at some point when I have more experience and tools.

        Thanks

        Edited By Steve Sherlock on 06/08/2018 15:29:38

        Edited By Steve Sherlock on 06/08/2018 15:30:30

        #365892
        Frances IoM
        Participant
          @francesiom58905

          I’d be surprised if the single wheel is really suitable for a cowells unless uses a very small wheel – there was a two part article by Maral in MEW about 2 years ago that used a cutting rather than a compression technique – will need some special holder made + a knurling wheel without a bevel but Maral claims low force required

          Personally I would just concentrate on getting used to the lathe + grinding/sharpening the small HSS tools it really needs

          #365894
          Tim Stevens
          Participant
            @timstevens64731

            You may find that a small lathe with a small tool-holder is not up to the job of knurling steel. Light alloy, yes, brass, yes, but even then only with a narrow knurl and with patience.

            Cheers, Tim

            #365895
            Sherlock
            Participant
              @sherlock

              Thanks Guys,

              I'm only working with brass and ally. I bought the lathe predominantly to make control knobs so would really love a knurling tool of some sort. I should add that I would probably only be using fine straight knurls any way.

              #365899
              Vic
              Participant
                @vic

                With care I think one of the scissor type knurlers may work on your Lathe provided you can get one to fit your tool post. I made one to suit my lathe.

                #365902
                Vic
                Participant
                  @vic

                  How about this.

                  **LINK**

                  It says: “Shank Size is 10 mm x 10 mm x 50 mm Long. This could easily be removed / modified if you needed a smaller shank”

                  #365903
                  John Haine
                  Participant
                    @johnhaine32865

                    This one claims to fit a Unimat so should work on the Cowells. I would not even try a single wheel knurl on a cowells.

                    #365904
                    Sherlock
                    Participant
                      @sherlock
                      Posted by Vic on 06/08/2018 16:22:05:

                      How about this.

                      **LINK**

                      It says: “Shank Size is 10 mm x 10 mm x 50 mm Long. This could easily be removed / modified if you needed a smaller shank”

                      Thanks Vic that's actually the one I linked to initially, but just realised the link wasn't working, Will I be able to bring that down with a hand file?

                      #365905
                      Sherlock
                      Participant
                        @sherlock
                        Posted by John Haine on 06/08/2018 16:42:32:

                        This one claims to fit a Unimat so should work on the Cowells. I would not even try a single wheel knurl on a cowells.

                        Thanks John, Seems we are all finding the same one! teeth 2

                        #365910
                        Vic
                        Participant
                          @vic

                          You may be able to file it Steve but why not give us your general location, someone on here local to you may be able to mill it down for you.

                          #365912
                          Sherlock
                          Participant
                            @sherlock

                            Thanks Vic, I'm in London.

                            #365952
                            John Reese
                            Participant
                              @johnreese12848

                              On my South Bend 10K I can use bump type knurls without damaging the machine. For smaller machines I would definitely choose the clamp (scissor) type knurls as shown in several of the posts.

                              #365955
                              JasonB
                              Moderator
                                @jasonb

                                For a straight "knurl" on brass you don't even need a knurling tool. Just mount a Vee shaped tool on it's side and traverse along the work. Simple gear on the spindle to index. Top of this lubricator was done in a similar way.

                                #365957
                                Sherlock
                                Participant
                                  @sherlock

                                  That Looks Great Jason I shall definitely like to try that. When you say a simple gear on the spindle to index please would you mind elaborating on that? or if you could link to a picture maybe that would be great so I can visualise it.

                                  Does it go behind the chuck, like a division plate? then something I'm guessing gets fastened somewhere else to index to those teeth?

                                   

                                  I went an ordered a scissor type knurled anyway for the sake of £14 and after realising the tool shaft is removable so I can just unscrew and take my angle grinder to it in a pinch.

                                  Edited By Steve Sherlock on 06/08/2018 19:46:18

                                  #365964
                                  JasonB
                                  Moderator
                                    @jasonb

                                    You should be able to use the large gear on the left of your spindle under the cover, a simple detent of some form to engage between two teeth will allow you to divide work into quite a few numbers

                                    #366086
                                    Ian S C
                                    Participant
                                      @iansc

                                      As sujested by Stan Bray in his book "Introducing The Lathe", I made this knurling tool, it's rough, put together in about an hour, it consists of a bit of scrap steel about 3/8"/10 mm square by 3"/75 mm long with a fork in the end, cut wit a hacksaw. The wheel is from a disposable lighter, this is fitted with a bronze bush, the spindle is a needle roller. It produces a fine, straight knurl, not requiring a great amount of pressure.

                                      Ian S C

                                      dsc01160 (800x600).jpg

                                      #366349
                                      Howard Lewis
                                      Participant
                                        @howardlewis46836

                                        F W I W, my preference is for the clamp type knurling tool.

                                        If you cannot find a set of drawings, or a tool, to suit your lathe, how about making one at a reduced scale?

                                        Perhaps Hemingway would sell you a set of drawings that you could "downsize" for your needs?

                                        Howard

                                        #366659
                                        Sherlock
                                        Participant
                                          @sherlock

                                          Ok guys, I went with one of the scissor types. Had a little play with it today….

                                          Now, After everything I have gleamed from the subject of knurling, I wasn't expecting things things to go smoothly and I was correct. Trouble is I seem to get knurls on the edges and not in the middle, like rail tracks.

                                          img_7656.jpg

                                          I know there are other problems on there such as double lines etc, but been trying to save on wasting stock so using the bar more than once to practice on to see if I can get it to cut in the centre to no avail.

                                          I tried changing the wheels from diamond to straight. Tried the bar stock rough, then tried after turning it to size.

                                          tried with and without cutting oil. Clamping directly on centre and a little off centre. clamping down quickly to gain a bite. All to avail.. Any ideas where I might be going wrong, Do a pair of 'rail tracks' with no knurl in the middle suggest I am doing something obviously wrong?

                                          #366662
                                          Roderick Jenkins
                                          Participant
                                            @roderickjenkins93242

                                            The first thing I would do with a small lathe is to put it into back gear, you will need lots of torque. My usual technique with a scissor knurl is to start with only a third of the tool width clamping on the job. I introduce the tool to the job and adjust the wheels so that they are finger tight on the diameter of the job. I then withdraw the tool and tighten the tool by about a quarter turn. Switch on the lathe and then advance the tool with the cross slide. This should produce a good pattern. Once the pattern is set then the tool can be advanced towards the headstock with the leadscrew.

                                            HTH,

                                            Rod

                                            #366665
                                            Anonymous

                                              Start at one end, with the knurls just overlapping the work. Once they've started to form a good depth of knurl you can move the knurling tool along the rest of the knurl. Trying to form the knurl full width will probably require more force than the tool can provide, unless you have a friendly gorilla in residence.

                                              Andrew

                                              #366668
                                              Sherlock
                                              Participant
                                                @sherlock

                                                Aha… Amazing. Thank you guys I had some success at last following your advice…

                                                img_7660.jpg

                                                Now then….. Suppose I don't want to start right at the end of the bar, but only want a small band knurled about the width of the wheel half way along the round bar.. Not possible?

                                                #366670
                                                Vic
                                                Participant
                                                  @vic

                                                  Have a look at this video by Joe.

                                                  **LINK**

                                                  #366672
                                                  Sherlock
                                                  Participant
                                                    @sherlock

                                                     

                                                    Posted by Vic on 10/08/2018 17:42:44:

                                                    Have a look at this video by Joe.

                                                    **LINK**

                                                    Thanks Joe, I actually watched that this morning while having my breakfast teeth 2

                                                    Actually here is a basic question I haven't found the answer to…. Does it matter which direction I have the lathe running? or is it inconsequential?

                                                     

                                                    Edited By Sherlock on 10/08/2018 17:52:06

                                                    #366678
                                                    Neil Wyatt
                                                    Moderator
                                                      @neilwyatt
                                                      Posted by Sherlock on 10/08/2018 17:21:19:

                                                      Aha… Amazing. Thank you guys I had some success at last following your advice…

                                                      Now then….. Suppose I don't want to start right at the end of the bar, but only want a small band knurled about the width of the wheel half way along the round bar.. Not possible?

                                                      Angle the knurl slightly.

                                                      Neil

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