Metric V Imperial Measurement

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Metric V Imperial Measurement

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  • #451145
    Ray Lyons
    Participant
      @raylyons29267

      Went to the hospital recently to see a consultant. On arrival, was taken into a side room for measurement, weight, height, blood pressure etc. Height came in at something like 1.7 and weight at 70. I soon got the brush off when I asked what these figures meant in British money. After all don't they quote baby's weight in pounds and ounces and the police give heights in feet and inches when describing a person. I wonder if Brexit will mean a return to British standards such as BSW and BSF.

      on a more serious note, I have to change some storage cupboard doors to flush mahogany ply. The fitted doors are a little wider than the new ones so I glued some extra lipping strips on to make up the width with the intention of trimming the excess overlap ( an excuse to buy a new palm router)

      Ordered a router advertised as fitted with 1/4", 3/8" and 1/2" collets. After a few weeks, I bought a 1/4" shank trimming cutter and today decided to try it out on a piece of scrap timber. The cutter would not fit so I checked the sizes of the collet and the cutter. Collet is .236in (6.4mm) and the cutter is .246in.

      The collet appears to be hardened so I think the best way out is to grind the bore using a small grinder in the lathe. If anyone has any experience of grinding a collet I would appreciate your advise.

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      #27129
      Ray Lyons
      Participant
        @raylyons29267
        #451146
        Brian H
        Participant
          @brianh50089

          My hospital (Kings Mill in Mansfield) keep conversion charts and are only too happy to quote measurements in English.

          Brian

          #451147
          JasonB
          Moderator
            @jasonb
            Posted by Ray Lyons on 07/02/2020 20:22:35:

            Collet is .236in (6.4mm) and the cutter is .246in.

            The collet appears to be hardened so I think the best way out is to grind the bore using a small grinder in the lathe. If anyone has any experience of grinding a collet I would appreciate your advise.

            I think you will find 0.236" is 6mm give or take a nats.

            Better to buy a 1/4" collet for your router or get a 6mm bit. I'd opt for the collet as 1/4" shank tools are still far more common here in the UK than 6mm

            What make is the router, 1/2" capacity sounds massive for a small palm router.

            Edited By JasonB on 07/02/2020 20:38:45

            #451150
            Dalboy
            Participant
              @dalboy

              Contact the seller and ask for the correct collets as it is advertised as imperial

              #451153
              lfoggy
              Participant
                @lfoggy

                Medicine and science in the UK have been fully metric for decades (certainly long before I qualified in the late 1980s). Even in the USA, the last bastion of of Imperial weights and measures, medicine and science largely abandoned pounds and ounces years ago. If you do want quick conversion though, there are many simple charts and apps to assist.

                Curiously, we still measure blood pressure in the archaic units of mm mercury (mmHg).

                #451173
                Vic
                Participant
                  @vic

                  I bought a router recently that came with 1/4” and 3/8” collets as standard. I also bought 6mm and 8mm collets for it though at the same time. All the new router bits I’ve bought for it are 6mm but I do have plenty of old 1/4” ones as well.

                  #451174
                  Steviegtr
                  Participant
                    @steviegtr

                    Wouldn't it be awesome if we went back to imperial. Stuff the rest of the world. Rule BRITANNIA. Britannia rules the waves.

                    Steve.

                    #451181
                    not done it yet
                    Participant
                      @notdoneityet

                      Curiously, we still measure blood pressure in the archaic units of mm mercury (mmHg).

                      Archaic to be in mercury, but metric, nevertheless. Was it ever measured in inches of mercury? Or even inches water gauge?

                      #451182
                      Steviegtr
                      Participant
                        @steviegtr
                        Posted by not done it yet on 07/02/2020 23:26:25:

                        Curiously, we still measure blood pressure in the archaic units of mm mercury (mmHg).

                        Archaic to be in mercury, but metric, nevertheless. Was it ever measured in inches of mercury? Or even inches water gauge?

                        You may have a point. Metal pipe fittings are still in BSP.

                        Steve.

                        #451183
                        Ian P
                        Participant
                          @ianp

                          On Wednesday this week I had an X-ray scan at a local hospital where my weight and height were measured in cm and Kg, The radiographer then looked at the two conversion charts on the wall and entered in the imperial values on her paperwork!

                          I was somewhat surprised but she assured me that how it was always done (maybe she meant thats how she had always done it)

                          I bet whoever interprets the images and processes the paperwork has conversions charts at their desk to convert to metric units!

                          Ian P

                          #451184
                          Steviegtr
                          Participant
                            @steviegtr

                            Oh & MPH

                            #451189
                            Mike Poole
                            Participant
                              @mikepoole82104

                              If drawings are dimensioned in thousandths of an inch then machining and measuring are easy unless you prefer a ruler. Drawings dimensioned in fractions of an inch are a pain as machines do not have dials in fractions. Metric is no problem if you think a millimetre is 40 thou. Metric is the way forward even if like me you are familiar and comfortable with both systems.

                              Mike

                              #451192
                              Bill Pudney
                              Participant
                                @billpudney37759

                                For what it's worth, in the mid 70s I was fortunate enough to be working as a ships draughtsman on the T22 frigate which became HMS Broadsword. This ship was all metric, and I was told that it was the first ship classified as "metric" to be designed and built by the MOD(N)

                                Since then I have been happy using either imperial or metric, although my preference is for metric, so much more logical than basing a system of measurement on the length of a random thumb, or forearm or whatever!!

                                cheers

                                Bill

                                #451194
                                S.D.L.
                                Participant
                                  @s-d-l
                                  Posted by Steviegtr on 07/02/2020 22:56:00:

                                  Wouldn't it be awesome if we went back to imperial. Stuff the rest of the world. Rule BRITANNIA. Britannia rules the waves.

                                  Steve.

                                  NO

                                  Steve

                                  #451196
                                  Speedy Builder5
                                  Participant
                                    @speedybuilder5

                                    As my Dad used to say – Can you imagine a simple plate 1m x 1m, now put 1Kg load on that and slip your hand under one corner of it. No Can't imagine that. Now, take a simple plate 1ft x 1ft, place 1lb on the plate and do the same – yes, I could imagine that. But we move with the times.

                                    #451197
                                    JasonB
                                    Moderator
                                      @jasonb
                                      Posted by Steviegtr on 07/02/2020 23:32:08:

                                      pipe fittings are still in BSP.

                                      Depends where you are getting them, most of the metric world works with "G" threads now wink

                                      #451200
                                      Brian G
                                      Participant
                                        @briang
                                        Posted by JasonB on 08/02/2020 07:27:44:

                                        Posted by Steviegtr on 07/02/2020 23:32:08:

                                        pipe fittings are still in BSP.

                                        Depends where you are getting them, most of the metric world works with "G" threads now wink

                                        First class stirring.

                                        I love the fact that there is no longer any connection between the BSP/G size and that of the pipe. It shows that sometimes practicality is allowed to override order.

                                        Brian G

                                        #451203
                                        Robert Atkinson 2
                                        Participant
                                          @robertatkinson2

                                          Aviation is still mostly imperial but is slowly coming round to metric, It can't come soon enough. On pipe fittings, SMC pneumatcs came up with Unithread male fitting with a special thread form that fits G Rc, NPT or NPTF female. Sealing is by a captive gasket.

                                          Robert G8RPI.

                                          #451211
                                          JA
                                          Participant
                                            @ja

                                            Some years ago, looking through a German table of metric threads, I found this (from memory) –

                                            M6,35 x 1,25 x 55degrees.

                                            In the drive to replace non-metric threads they had to admit defeat when it came to the universal camera mounting thread.

                                            JA

                                            #451213
                                            Chris Evans 6
                                            Participant
                                              @chrisevans6

                                              I spent my 50 years working life in toolmaking. About half using imperial and half metric, no problem using either. My home machinery is metric as that is what I found when needing machines. Tinkering around with old British bikes I mainly work with imperial measurements without problems. I do stop and think when sizes come up in centimetres and quickly multiply by ten. Post Brexit will we buy petrol by the gallon again ? Nudging £6 a gallon will make folk stop and think !

                                              #451215
                                              Mick B1
                                              Participant
                                                @mickb1
                                                Posted by Steviegtr on 07/02/2020 22:56:00:

                                                Wouldn't it be awesome if we went back to imperial. Stuff the rest of the world. Rule BRITANNIA. Britannia rules the waves.

                                                Steve.

                                                I think you're forgetting the cost, in working ships and men, sunken ships and dead men.

                                                #451216
                                                Spurry
                                                Participant
                                                  @spurry
                                                  Posted by Chris Evans 6 on 08/02/2020 09:19:11:

                                                  Post Brexit will we buy petrol by the gallon again ? Nudging £6 a gallon will make folk stop and think !

                                                  Yes that's a good one! One of the bigger cons I think, selling petrol by the litre. My most expensive, to date, was paying 147.90p/L = £6.72 per gallon. Doesn't seem that long ago it was 5 bob/shillings per gallon, but that's showing one's age…wink

                                                  Pete

                                                  #451220
                                                  martin perman 1
                                                  Participant
                                                    @martinperman1

                                                    Can somebody explain why we buy timber as inch x inch x metres.

                                                    Martin P

                                                    #451223
                                                    JasonB
                                                    Moderator
                                                      @jasonb
                                                      Posted by martin perman on 08/02/2020 09:52:08:

                                                      Can somebody explain why we buy timber as inch x inch x metres.

                                                       

                                                      Martin P

                                                      Have you actually measured that "4×2", I think you will find it is 47mm x 100mm not 51mm x 102mm

                                                      Edited By JasonB on 08/02/2020 10:08:38

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