8 Replies Latest reply on May 25, 2016 2:19 PM by D_Hersey

    Sensor

    n7kon

      I would like to ask if there are any sensors that I could use in detecting the level of powder in a case while reloading. The only thing I can find commercially only tell you when a case is empty or over full. I want to know if it has a level between those two.

      1. the level I want

      2. anything short of that level

      3. anything above that level.

       

      any advice would be great thanks

      Keith

        • Re: Sensor
          mcb1

          A bit more info might help with the answers.

          1.     size how big is the height and depth

          2.     Case material ... wood, brass, plastic

          3.     What are you adding into it.

           

          My first thought is weight using a stain guage.

          That requires to know what empty case and full weight will be.

           

          Mark

            • Re: Sensor
              n7kon

              Thanks Mark

              case is 9mm case

              material brass

              adding gun powder

               

              no way to weigh the case in a press. I have a powder die that has a rod that checks the height of the powder. it will only stop me if I am very over full or have an empty case. Wondering if there is a way to read the level of the shaft or some way to measure the height inside the case while still in the press.

               

              Keith

                • Re: Sensor
                  mcb1

                  Well that makes things very difficult.

                   

                  V8 supercars weigh the full fuel filling tank and then weigh what remains after a fill, thereby knowing how much fuel they added.

                  Can you weigh the powder before and during filling.

                   

                  Alternatively if the press was also on the weigh table, then only the added weight would register.

                  However there would be a large offset so whether it is sensitive enough is another question.

                   

                  I'm picking that it's a few grams of powder we're taking about.

                   

                  Mark

              • Re: Sensor
                shabaz

                Hi Keith,

                 

                If you scroll down to the section titled Linear Travel on this page: Keysight U1282A Vehicle/Automotive and Industrial Applications

                you'll see a sensor that can resolve to about a millimetre or better. It is like a plunger without a spring (a spring could be added with some modification). The shaft is light, doesn't need much force. The end is a screw thread, perhaps it could be fitted to something the diameter of the case you refer to.

                It's just an idea, I don't really know if it is suitable or not.

                • Re: Sensor
                  dougw

                  Traditionally the most accurate linear position sensor is an LVDT (linear variable differential transducer) but they can be expensive. A linear potentiometer is a pretty good low-cost alternative.

                  Maybe you could hook up digital caliper to measure position.

                  If you want alarms and extra features, you can connect a digital caliper to a USB port or an arduino for further processing - lots of examples on the net.

                  Is it possible to pre-weigh or pre-measure the volume of powder and make a loader or dispenser that loads the correct amount? Like a syringe with graduated markings on the side, or even a mini measuring cup.

                  • Re: Sensor
                    DAB

                    I would use a pressure sensor to measure the weight of the container.

                     

                    Once you know the weight for an empty one, and then a full one, you can see about where you are with what is left.

                     

                    DAB

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