Experimental Studies on the Load and the Harrowing Characteristics of Puddling Machines Part V

On the Effect of the Lug Angles and Puddling Depth of Rotors on the Soil Dispersion

Abstract

The writer made experiments on the lug angles, working depth, peripheral velocity, slippage ratio and other conditions, constituting the factors of load characteristics, in order that he might clarify the crumbling characteristics of soil handled with rotors. They disclosed:
(1) That the increase in slippage required greater lug angles, and that this increase resulted in an increased electricity consumption and puddling resistance per unit working width and cross sectional area, in exponential proportion.
(2) That, in the range of six to twelve centimeters the load increase was in exponential proportion to the working depth of rotors.
(3) That, in the case of heavier puddling machines (i. e. over 1.0kg/cm of working width), the lug angles of rotors should advisably be over 45°, in order to give more supportiong power to the machine, and that, in the opposite case, the lug angles should be smaller so as to raise, the working effect on soils.