of Material* 17<> 



tire plant which uses an assembling line must be 

 scheduled with reference to it. This principle 

 applies, in scarcely a less degree, to all assembling 

 industries, because all the operations in making 

 the separate parts lead up to the final assembly, 

 and the starting of work on each of the various 

 pieces must be made with reference to that as- 

 sembly. This has been aptly termed "pulling" 

 the work through the shop; that is, each p 

 is scheduled back from the time you want it. to 

 determine the time it is to be begun. 



The Control Board. The use of diagrams or 



rol boards is a great help in scheduling. In 



industries such as an automobile factory these may 



be very elaborate. A simple Control Board is 



shown on the insert facing this page. 



This diagram shows how the person who lays 

 out the schedule determines when the material 

 must be requisitioned and work started on the 

 various parts. To lay out such a schedule, he 

 must know what machines are available, the num- 

 ber of operations for every piece, the time each 

 operation takes, and the time required for each 

 move of the material between operations. 



In the case shown it is desired to have the final 

 product ready on June 5th. It is known that as- 

 sembling will require four days. It must, th 

 fore, begin on June 1st and all parts and sub- 

 assemblies must be ready by that date. Part No. 

 4 requires a longer time to make than any other 

 piece Corking backward from May 31st, it 



is seen that this part must start on April 10th. 



