I'm replacing a water shut off ball valve on copper piping down in my basement.. I took off the old valve and sanded and brushed the piping and even the new piping and fittings then I put a thin layer a flux on all my ends, then connected, But then I go to apply a low heat on the piping where it connects, the piping is getting hot but the solder seems to start to melt but as it starts to drip down it hardens and breaks off. What am I doing wrong, I took it all apart and resanded and everything but the solder doesnt seem to suck in and roll down and seal like its suppose too Yesterday when i tried it we had a small water drip so I made sure all the water was shut off and then opened up all my falcets in the bathroom and kitchen to get air in the lines but today, I resanded and fluxed and still the solder will not melt, this is the second roll of solder I have went through, why wont the solder melt the way it should? Any advice would be so appericated, Thanks
You can find the force you need by gently placing weight on top of the can until it collapses. You could do this with and without denting the can to determine if the benefit of less required force is worth the increased complexity required to make the dents. The force would just be the amount of weight it took times gravity. As far as calculating the force theoretically, that would depend on the geometry and materials of the can and require some complex equations you can find in your Mechanics of Materials text book. I'd avoid this unless this is a project for you MoM class and the professor told you to. Then you should be asking your classmates or professor this question. If you have access to a metal shop, I would use whatever scrap steel they have around. If not, you can use cheap pine wood. Keep it simple. Pull lever, crush can.
Gravity is situated on earth, not in space. Gravity pulls objects towards the centre of the earth. You can test it by jumpingI'm not sure what else to say.
