BA, ME, Metric Coarse or Imperial : which taps and dies to buy ?

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BA, ME, Metric Coarse or Imperial : which taps and dies to buy ?

Home Forums Hints And Tips for model engineers BA, ME, Metric Coarse or Imperial : which taps and dies to buy ?

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  • #149520
    Brian John
    Participant
      @brianjohn93961

      I am new to model engineering and I am wondering what nuts, bolts, taps and dies most people use when building model stationary steam engines. Is it BA, ME, Metric Coarse or Imperial ? Are there a few sizes which keep cropping up ?

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      #30488
      Brian John
      Participant
        @brianjohn93961
        #149522
        Bob Perkins
        Participant
          @bobperkins67044

          Hi Brian

          when I started a couple if years ago I bought what I needed when I needed them. I have built a collection of tapa and dies I use all the time now. If I had bought sets there would be many unused. I adopted the same strategy for reamers and milling cutters. The only set I don't regret buying was a comprehensive set of drills

          #149523
          JasonB
          Moderator
            @jasonb

            I think the best thing to do is look a a few engines that you think you are likely to want to build and see what they use, for example if you want to do some of the Stuart range then they will use BA fixings and a few ME sizes on pipe fitings etc. On the other hand if you like the look of Anthony Mounts engines then these are generally in metric but can have BA fixings and a finer ME pitch than Stuarts on their steam fittings. If its the European designs then metric fine pitch would be the way to go. American designs mostly use UNC with a bit of UNF

            From the above you can see there is no real system that suits all subjects so probably best to buy the individual taps & dies as needed rather than sets that will contain ones you may never use.

            You can of course substitute whatever thread form you like but need to follow that through on the whole engine, for example if the original design had say a 5BA thread on teh end of a rod and you wanted to go all metric then the nearest thread would be M3 but really you should also change the rod to a smaller 3mm one and any holes that rod passes through to suit.

            #149526
            GoCreate
            Participant
              @gocreate

              Hi

              It's worth investing in good quality taps and dies. I have found that the quality of ME taps and dies in carbon steel is generally poor and I have had difficulties getting good fitting threads using these. I no longer waste my time using these.

              As a result I now only buy good quality HSS taps and dies, To keep my cost down I try to stay with UNF, and on larger sizes UNEF, for fine threads and BA for small threads. For general use I use metric course. Metric fine would be a good alternative to UNF.

              Mostly I am using 10 to 0 BA sizes, UNF 1/4" to 3/4" and UNEF 3/8" to 3/4" and rarely use anything else. Where metric or ME sizes are specified I will substitute with these.

              I find by sticking to this philosophy good quality brand tools can be bought at relatively good prices.

              Maybe others have had better experiences with ME taps and dies and can recommend a good quality source at reasonable prices.

               

              Nigel

              FYI here's UNEF thread range which I find very useful.

              Edited By tractionengine42 on 11/04/2014 08:02:45

              #149532
              Robbo
              Participant
                @robbo

                I would say wait and buy them as you need them. Go for quality HSS rather than carbon. A reliable source is Tracy Tools, and they send them quickly so you won't have to wait long to tap that thread!

                #149536
                Brian John
                Participant
                  @brianjohn93961

                  I have already bought carbon steel ME taps for the 1/8-40, 3/16-40 and 1/4-40 (Tracy Tools) but these will be used on copper and brass for pipe work and boilers so they should be okay for that.

                  I will follow the above advice and just buy what is needed and only buy HSS taps and dies from now on. Thanks.

                  #149537
                  JA
                  Participant
                    @ja

                    Buy the best you can afford when you need them. This also applies to reamers, end mills and slot cutters. Mistrust any vendor that sells you a tap, die etc loose (not in a protective case). Never buy on impulse.

                    Generally I have found Chronos's dies, taps etc excellent quality, both carbon and high speed steel, and their service good.

                    JA

                    #149544
                    Roderick Jenkins
                    Participant
                      @roderickjenkins93242

                      Carbon steel taps and dies are just as hard or harder than HSS. For hand tapping the only advantage of HSS is that it is generally tougher so you are less likely to break a tap in the smaller sizes. The major cause of tap breakage is probably using too high a percentage of engagement. Use Tubal Cains' recommendations for tapping size drills and you can pretty much eliminate tap breakages. Using a tapping guide like the Universal Pillar Tool also helps and will allow you to use the carbon steel versions, with a considerable price advantage. In my opinion HSS is not the wonder metal some people make it out to be. It's advantage over carbon steel is that you can get it to red hot without softening: so great for lathe tools and milling cutters. For taps and dies – not a major plus point to the model engineer.

                      I've had a lot of carbon steel taps and dies from Tracy Tools and have found them perfectly satisfactory.

                      Just my tuppenceworth,

                      Rod

                      #149546
                      Chris Parsons
                      Participant
                        @chrisparsons64193

                        I would also give a thumbs up for Tracy Tools (they are local to me which is also pretty convenient)

                        I started a year or so ago and decided to 'go metric' as this is what my lathe and mill were, but have bought many other odd (ME and BA mainly) taps and dies since as and when the need came up.

                        I originally went for a boxed set of metric taps and dies (2- 10mm) which got me going but would agree that they get blunt quickly and most of the commonly used sizes have been replaced by HSS ones from Tracy – but this does mean you have a convenient box to keep the various sizes in, which I am starting to find is a problem with the others – rummage through the drawer and the one you want is always the last one you pick up…

                        As someone has mentioned you can get HSS boxed sets but they are a few quid and you may end up with ones you never use

                        Chris

                        #149547
                        Another JohnS
                        Participant
                          @anotherjohns

                          Brian;

                          Not knowing where you are, for me, overseas, BA is a non-starter. Kirk Burwell of Hemingway Kits no longer supplies BA with his kits, because getting quality fasteners is tough. (read it in full on his web site)

                          You may wish to use metric; that's what I do. Most others here use UNC/UNF, but I think in the long run, metric will win out.

                          When I started out, I, too, purchased a set of ME taps and dies from Tracy tools, but I did have issues getting threads to fit, and slowly, the Tracy ones were replaced. Now, I use metric fine – and I get the taps and dies from a tooling supplier; maybe a lot of money for a tap set, but, you might as well purchase the best.

                          (The Tracy Tools set were a "life saver" – not putting them down in any way, but now I just purchase what I need)

                          Another JohnS. Blog: **LINK**

                          #149561
                          Brian John
                          Participant
                            @brianjohn93961

                            I live in Cairns, Australia and I purchase from both the UK and the US.

                            #149563
                            Martin Walsh 1
                            Participant
                              @martinwalsh1

                              The hss v carbon taps and die debate has been going on for quite a while

                              I personally buy carbon steel taps and dies for 2 reasons 1 they are quite a lot cheaper than hss

                              and 2 for cutting threads by hand there is no real advantage using hss

                              hss is only better if you cut threads under power

                              I buy my taps and dies from the tap and die company http://www.tapdie.com

                              Although they are manufactured in India they have got the most modern factory

                              and equipment to make them.

                              Best Wishes Martin

                              #149564
                              Another JohnS
                              Participant
                                @anotherjohns
                                Posted by Brian John on 11/04/2014 13:54:26:

                                I live in Cairns, Australia and I purchase from both the UK and the US.

                                Brian;

                                I got my start in metric when living in NZ back 1990 timeframe – became fully metricated shortly after that when living in continental Europe.

                                I could be wrong, but I'd think metric would be easiest?

                                I'm currently building a Martin Evans' designed locomotive, "Ivatt", and I convert to metric and write things down on the drawings and/or in a notebook. All fasteners (well, except the 8BA threaded handrail stanchions I purchased ready-made) are metric.

                                I do have trouble purchasing metric dimensioned stock, but as much of what you do leaves little of the original stock showing, so what?

                                Anyway, I'm having fun with this build, just need more time in the workshop…

                                John from Canada.

                                #149565
                                Martin Walsh 1
                                Participant
                                  @martinwalsh1
                                  Posted by Martin Walsh 1 on 11/04/2014 14:09:42:

                                  The hss v carbon taps and die debate has been going on for quite a while

                                  I personally buy carbon steel taps and dies for 2 reasons 1 they are quite a lot cheaper than hss

                                  and 2 for cutting threads by hand there is no real advantage using hss

                                  hss is only better if you cut threads under power

                                  I buy my taps and dies from the tap and die company http://www.tapdie.com

                                  Although they are manufactured in India they have got the most modern factory

                                  and equipment to make them and they are top quality

                                  Best Wishes Martin

                                  #149569
                                  Bob Youldon
                                  Participant
                                    @bobyouldon45599

                                    I have to agree with those who have said buy whatever you require at the time and I can also concur carbon taps and dies are perfectly adequate for general model engineering, just use the right cutting fluids/ pastes where necessary. I have recently succumbed to replacing one of my 6BA taps I purchased when first starting out. . . . . more than sixty years ago!

                                    Regards,

                                    Bob Youldon.

                                    #149589
                                    Steve Withnell
                                    Participant
                                      @stevewithnell34426

                                      My practice has been to buy taps and dies to suit what ever I'm working on and only when I need them. It can be more expensive on a one off basis, but cheaper compared to a full sets of which only a couple ever get used.

                                      The issue about HSS v Carbon Steel isn't so much about the material itself, it's just that there are a lot more junk taps/dies about made from Carbon Steel – my opinion, so if you buy carbon steel, you do need to be particularly careful about the quality/sourcing. A quality HSS tap will always be better than a junk carbon steel tap.

                                      Steve

                                      #149632
                                      Bill Pudney
                                      Participant
                                        @billpudney37759

                                        I buy taps and dies as I need them. Having bought a few carbon steel taps/dies early on in my journey, and being burn't every time I now buy HSS/ground thread irrespective.

                                        The problem I have found is burrs left by the milling of the flutes, Most of the threads I generate are in al. alloy and fairly fine pitch, usually under 1.0mm. Sometimes the burrs on carbon steel taps and dies completely changes the thread form, to the extent that some "threads" formed resemble a vague squiggly helical groove rather than a thread form. Whereas all the ground thread taps I have, and there are quite a lot, are burr free. Now obviously on a M12 x 1.5 tap any burrs will be relatively smaller than the burrs on my fairly small carbon taps, and its possible that tapping harder material may remove some burrs.

                                        Wherever possible I drill and tap either in the lathe or the mill, so alignment is assured. Also, I almost always use hand power rather than tapping under power. Some good tapping fluid is a good idea as well. For what It's worth if the right size tapping drill has been used, I believe that most taps are broken by being misaligned. Hence my use of the mill or lathe.

                                        Just check your taps and dies with a good loupe in a good light.

                                        cheers

                                        Bill

                                        #149634
                                        Brian John
                                        Participant
                                          @brianjohn93961

                                          I will not be tapping under power. It is my intention to tap in my Sieg C2 lathe, turning it by hand. But I have to get it set up first ; it is still sittting in the box on the floor. It is much heavier than I thought it would be ! My first lathe job will be to make a spindle handle so that I can turn the lathe by hand for tapping. I thought all lathes came with a spindle handle as it seems such a useful accessory.

                                          I will buy my taps from either Tracy Tools or Chronos Engineering.

                                          What is the verb for using a die ?

                                           

                                           

                                          Edited By Brian John on 12/04/2014 04:55:45

                                          Edited By Brian John on 12/04/2014 04:57:08

                                          #149639
                                          JA
                                          Participant
                                            @ja

                                            To die.

                                            JA

                                            #149645
                                            Rik Shaw
                                            Participant
                                              @rikshaw

                                              Using a die? – To thread, I thread, you thread they thread, we all thread (that is of course when we are not wasting time at these blessed keyboards)wink 2

                                              Of taps and dies? I have collected hundreds over the years – both metric and imperial – whitworh, bsf, unf, unc, ba, bicycle, gas – you name it! Two things though – I have NEVER paid full price from a dealer and I only use HSS. Avoid cheap carbon steel unless you regularly tap/thread cheese.

                                              Rik

                                              Motto: Everything comes to 'im as waits!

                                              #149650
                                              Brian John
                                              Participant
                                                @brianjohn93961

                                                So the gerund is dying :'' I am dying this piece of copper tube''. That sounds strange !

                                                How do you not pay full price from a dealer ?

                                                I would assume that the carbon steel taps from both Tracy Tools and Chronos Engineering are of good quality but I am now inclined to buy HSS.

                                                Metric : coarse or fine ? It seems that coarse is the most commonly used but all opinions are welcome.

                                                 

                                                 

                                                 

                                                 

                                                Edited By Brian John on 12/04/2014 10:52:55

                                                #149657
                                                Russell Eberhardt
                                                Participant
                                                  @russelleberhardt48058

                                                  One more point to remember is that some metric (more correctly ISO metric as BA taps are also metric) taps are supplied with the taper tap cutting full size while those from the continent are often in sets where the taper tap cuts undersize, the second a bit bigger, and the bottoming tap full thread so you need tto use all three even if tapping a short open ended thread.

                                                  Russell.

                                                  #149668
                                                  Another JohnS
                                                  Participant
                                                    @anotherjohns
                                                    Posted by Russell Eberhardt on 12/04/2014 11:22:59:

                                                    One more point to remember is that some metric (more correctly ISO metric as BA taps are also metric) taps are supplied with the taper tap cutting full size while those from the continent are often in sets where the taper tap cuts undersize, the second a bit bigger, and the bottoming tap full thread so you need tto use all three even if tapping a short open ended thread.

                                                    Russell – very true. These taps usually have rings around them, by the designation. One ring – first, two rings, second, NO rings, third. I know you know this, but it might throw off some people who don't – I learnt the hard(ish) way.

                                                    Brian – 99% of the threads I cut are metric coarse, a few, boiler fittings, etc, are metric fine, of various pitches.

                                                    John.

                                                    #149670
                                                    Brian John
                                                    Participant
                                                      @brianjohn93961

                                                      It was my intention to buy the taper tap (1st) and bottom tap (3rd) ; I was not going to buy the intermediate tap (2nd). Is it necessary ? Most sets only have the first and third taps.

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