The helical spring is the most common element that has been used in automobile industries. In this work the spring constant and deflection of the spring at different loads have been calculated. A closed coil helical spring is used for calculating tension and open coil helical spring is used for compression. The component used for the fabrication of the spring testing machine are frame, hydraulic, spring weighing machine, open coiled and closed coiled helical spring etc. In this machine the combined testing of both tension and compression can be done. The data obtained from the machine the compared with the manually calculated data and all the result obtained are in good agreement.