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Work in metric????

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  • #16
    Did that once, the inch metric project mix thing. It was a programming project though, where I proved the metric thread thing "en masse" to the non- believers.

    We make these real cool air engines in my shop. I will take this advise and try the mix dimensions. I am also evil to a fault.

    Still want you to be a visiting teacher. I still get a chuckle about the boots things you posted.


    • #17
      It was not that funny when it happened. Smashed my little toe with a big piece of structural steel I put on the welding table when my helmet dropped down - at least I thought it was on the table...

      Sneakers do not - I repeat, do not make good steel toe boots. Mean bugger made me wear safety boots after that.

      Second moral, buy your own personal welding helmet and warn your co-workers that certain death awaits any knob using your helmet for any reason.

      Third moral: Kicking holes through walls when you are not drunk with your other good foot makes for bad "Kodak Moments" - even if it does offer theraputic pain releif. Hence "Little Dave", "400lb. gorilla" (at least I kept my clothes on that time).

      Oh, to be young, stupid, and indestructable again. Ok, maybe leave the stupid part out.


      • #18
        Don't worry, the US is going metric. All new vehicles are made metric, even my new 3/4 ton pickup. So, all mechanics will need metric tools, imperial tools will become as obsolete as whitworth in 20-30 years.

        Personally, I use both. But most machining is done in imperial units. It wouldn't bother me if we converted to metric tomorrow.

        Mike L
        Mike L
        Amateur machinist, self-taught. I had a poor teacher, but I was a good student.


        • #19
          For me, I think it is just getting an introduction to a different system. In my freshman physics class, a loooong time ago, we had to use three different systems. Imperial, MKS(That is now called the metric system), and CGS(Centimeter, gram, second system), which was a now obsolete system used in scientific measurement. I still remember a test question in which we had to figure out the lifting power of a balloon. None of the quantities we needed were in the same units, he even mixed some of them up, like the density of helium in grams per cubic inch, and he wanted ther lifting power in pounds.


          • #20
            Cross conversion of units made easy.
            HP-48GX. It is cute, cuddly, only eats AAA batteries - and no calculator poo to clean up either! RPN! What else could you ask for?

            Thank God there is no Metric Bolean Algebra. Yet.


            • #21
              <font face="Verdana, Arial" size="2">Originally posted by Axel:
              Of course the metric system is better, the whole world (almost) is using it exept the USA.</font>
              At last report, Burma and Liberia are nearly full-metricated in law. That leaves only the USA - being only ~40% metricated. Of course, custom lags, and even "fully" metric countries have some non-metric tranasactions. According to one report, in Britain women and dog food are still weighed in "stones" (don't understand the connection, but there it is...).


              • #22
                According to an Australian friend of mine, Australia went Metric many moons ago, but guess what, no Metric screws, bolts or nuts for sale in the local hardware stores. I personally think that the Metric System is something that came out of the anarchy of the French Revolution as a symbol of France's determination to be "different" from the rest of the world.


                • #23
                  its easier to put on slippers than to try 'n carpet the world....!!!

                  I just make do with what I got/can easily find...and convert as necessary!!

                  Be Safe!


                  • #24
                    "Here is one for you CNC Lathe guys. I got a program to make, all imperial dimensions but for a met thread. Tried this out on a piece of scrap stock first. Programmed the entire part in english but for the thread, then used the "inch / Metric" G-code switch for the thread, then switched back to english afterwards.

                    I have done this with Met tapping as well on a mill.

                    Anyone else a CNC person whom has done this? "

                    Occasionally I'll have to thread a metric external thread on the CNC lathe. I have a chart that shows all the common metric threads with there equivalent inch dimensions.

                    I'd be afraid to program directly in metric because of all the parameters in the threading cycle, I might get a critical one wrong and break a cutter or worse.

                    I guess I could program in inches then turn the metric option on and it'll convert the whole program to metric, but there's not much use. My thread micrometers are all inch type so I might as well do everything that way using the conversion chart.


                    • #25
                      I can confirm what Al Messer says. Most local hardware shops in my area (North Queensland, Oz), still carry a full range of Whitworth threaded fasteners (mostly made in Taiwan!) but carry only 8mm, 10mm and 12mm bolts, and those only in lengths commonly used by builders. Some have a fairly limited selection of metric stuff in very expensive small plastic packs, but to get any sort of a selection you have to go to a specialist fastener supplier. But, hey, it's not quite 30 years yet since we "went metric" - you can't rush into these things!

                      What it means in practise is that if I am building something for the shop, I will design it in metric,which is easier once you get used to it, and use metric threads on most bits I make, but most of the purchased bolts etc. used will be imperial. I have got into the habit of stamping the thread type on things like tee nuts to save confusion. Most stock steel sizes have been metric for years, but recently I couldn't buy 20mm shafting locally; however 3/4 in. was available!

                      Just to add to the confusion, one of my lathes has imperial graduations, the mill drill has metric graduations, and the other (Chinese) lathe has both. It also has an imperial leadscrew, but metric gears and fasteners! Thank heavens for pocket calculators.

                      However, to answer the original question, yes, I now prefer to work in metric, and can visualise metric sizes more readily than imperial ones. Took a long time though.



                      • #26
                        Well for my two cents a simple set of () next to the inch measure will suffice if it is an American publication and if it is lets say a Mongolian publication or some other third world country like France then the inches would be inside the ().

                        It only makes sense since both systems have their streghts and weaknesses.

                        People in Europe can maybe turn around and pick up a 20mm piece of cold rolled to fit thier 20mm bore ball bearings,but not here,We can turn around and pick up our 3" channel iron and people in Europe can't,so we're even.Personally I say thank god for Inch dimesion ball bearings


                        I just need one more tool,just one!


                        • #27
                          Bringing up an ole favorite topic!

                          "imperial tools will become as obsolete as whitworth in 20-30 years"

                          30 Years? Ford converted to all metric in the mid 80's I think. At least I know my 84 Mustang didn't have an imperial fastener on it. I use metric when required, all my iron is UN-metric. I will admit that CAD is easier in millimeters. With a smaller unit I find I work with more integers which makes the math easy.

                          [This message has been edited by jkilroy (edited 01-01-2006).]
                          James Kilroy


                          • #28
                            Why drag up a four year old thread just to discuss metric vs. Imperial?

                            Metric is just another system to measure things. It is no better or worse than any other, and something this big around is this big around no matter how you measure it.

                            Some pseudo-sophisticates intimate the metric system is somehow superior due to its scientific background.

                            The current definition of a meter is the length of the path travelled by light in a vacuum during a time interval of 1/299,792,548 of a second. How's that for a proveable number, and can we really be sure that it is not 1/299, 792,547 or 1/299,792,549 of a second?

                            The fact is that the metric system of measurement has been tinkered with since its inception to make it fit. It is just as much a derived measurement as the inch or any other method of measurement.

                            If I recall, it was originally derived from some portion of the diameter of the earth, calculated in error by a couple of Frenchmen.

                            [This message has been edited by JCHannum (edited 01-01-2006).]
                            Jim H.


                            • #29
                              Metric? No good reason. Why are counties willing to sell imperial lathes and milling machines to us "backwords" people? Well it keeps them out of the poor house. If the rest of the world commits suicide should we? Of course not.

                              As far as cars being all metric, there is no such thing! There are a real mix, makes the mechanics buy both sets of tools. I suppose that is good for the someone, just not the mechanic or those that pay to have their car fixed!

                              Just my not so humble opinion!

                              Paul in NE Ohio

                              [This message has been edited by PHiers (edited 01-01-2006).]
                              Paul in NE Ohio


                              • #30
                                I can work in either one but prefer english.
                                Non, je ne regrette rien.