Abstract:
Forecasting demand and planning ordering tooling used in production. Case study auto parts manufacturing company. The purpose of this study was to determine an appropriate forecasting method to forecast tool demand and to analyze the purchase quantity of tools that are suitable enough to meet the demand. By means of product classification ABC Analysis and analyzing product demand data and then try to forecast demand which uses Minitab 21 forecasting program to find suitable forecasting methods. There are 4 methods 1) moving average 2) single exponential smoothing 3) double exponential smoothing 4) winters method. From the results of the study, it was found that the single exponential smoothing methods which show the lowest moving average. The researcher therefore chose this method. Used to find the forecast of product demand. Then bring the results to plan the purchase order by finding the economic order quantity to reduce overall costs. Manage by using re order point and find the amount of inventory in reserve (safety stock) to control the inventory to the appropriate level. Finally, this study comparing the total cost of traditional inventory management to the new inventory management, it was found that the total cost of the new inventory management was reduced to a value of 916,271 baht or 42.75%.