Hello; The rubber tire “vent spew” is wrong. It’s called a “vent SPRUE” and it’s used in many casting methods of various materials. Ensures that there are no areas where air gets trapped and prevents the mold from being able to completely fill. It gives the air a path to escape or to be compressed. It’s also used to allow excess material to be held in areas to ensure as the product cools. The area can pull material back from the sprue area to prevent voiding also. Stunningly i´m quited amazed respect getting quite suppressed with dynamism of machines constructions quite interresting others. There are many enormous buildings and spaces in every city, but have you ever wondered what machines are used to build them? In this video; We have looked up the most potent machinery used in construction.