The filling of a straw mushroom mixture use more time and a labor, because the mixture has a fiber of cotton rag that look like the lump. The objective of this study is design and building the chipper machine of infection straw mushroom mixture. The experimental have 3 factor that are motor speeds300 400 500 600 700 and800 rpm, next, the initial weights of infection straw mushroom mixture 1 2 3 4 5 and 6 kg and the last one, the pull rod are circle up - circle down, circle up – flat down, flat up - flat down and flat up - flat down. It was found that, the pull rod is circle up-circle down that has the higher efficiency 100% at 800 rpm of motor speed and can be pull the initial mixture 5 kg by the timer is 14.40 sec. In addition, the capacity of pulling is 250 kg/hr.
Keyword:pull rod, cotton rag, infection straw mushroom