Due to its complex dynamics, turning process has always been of interest ‎to ‎machining researchers and much effort has been made to determine the ‎forces. The aim ‎of this paper is to define the amount of ‎difference between ‎Altintas formula, dynamometer value, and the value which ‎is obtained by ‎providing a new method based. Practical tests are done to verify the results. ‎The tests are ‎performed for boring state with different parameters and the ‎force signal is determined using a ‎dynamometer andthe new method in which ‎the acceleration of one point of the ‎tool is used. Using the results of these two ‎signals, the parameters needed to ‎calculate the force components in Altintas ‎approach and the new method are ‎derived. The results ‎show that the tool tip ‎force, resulting from the new method which considered ‎the effects of ‎displacement and acceleration tool, obtains the greatest force ‎amplitude. The ‎force at the end of the tool which is derived by dynamometer ‎has lower and ‎the force resulting from Altintas approach has the lowest amplitude, in which ‎the cutting force is ‎only considered as a factor of chip dimensions. Therefore, ‎because of their ‎important differences, these forces should not be used ‎interchangeably.‎