An engineer and a technician have to activate the program and survey the automatic milling process to ensure that the milling operation is running smoothly. The cutting tools have to be replaced after certain time intervals. This activity will take from 5 10 days as the bottom part of part # 3 is less complex than the top part, also there is less work to be done as there less material to be removed. According to the life span of the tools and the problems that may be faced in the process of milling a large variance of time has to be accounted for.230) – Final milling of bottom of part # 3: After the rough milling of bottom of part # 3 a final milling operation has to be done to reach an acceptable surface finish and a pre-final accuracy. This activity may take from 3 5 days due to huge number of iterations that have to be done to achieve the required specifications. This operation takes less time than the top surface because there is less work involved in this surface. As the engineer has to make trials in order to reach optimum speed and feed that result in the desired surface finish, he cannot pre determine a deterministic time span in which the activity can be completed.240) – Inspection of dimensions of the bottom plane of part # 3: After the final milling operation the engineer has to check the dimensions achieved by this operation. Normally this will take one day, but practically the desired dimensions can not be obtained as planed in the program. So generally this inspection is followed by one or two iterations on the CNC milling machine according to the variance of dimensions the engineer has found. So it can take up to 3 days.250) Removal of part # 3 from the CNC milling machine: After ensuring that we achieved the required dimensions 2 technicians have to remove part # 3 with its setting from the CNC machine. This is followed up by cleaning the machine and preparing it for following operations. This deterministic activity takes half a day.260) – Manufacturing left plane-setting of part 3 for the CNC machine: In order to work precisely on the CNC machine a setting has to be manufactured on workstation # 1. This setting must be designed after making the programs for the CNC milling machine, because the engineer who designed the program is the one who must take into account the settings required to fit his program. Also raw materials have to be available. Two technicians will take from 10 20 days in order to complete this setting, which will function as a support and a mean of fixation on the CNC machine. Due to the complexity of the design (rigidity, very large and smooth surface area, and a very accurate height) several iterations have to be made to achieve the requirements. The surface area must be grinded on work-station # 9 and the setting must be heat-treated in work-station #4.265) Assembling the left setting with part # 3: After manufacturing the setting, and removing part # 3 after completing the bottom plane milling, two technicians will take from 2 – 4 days to assemble part # 3 to the setting by means of bolts and nuts and welding on workstations 5 & 7. The variation in the time is due to the fact that the complexity of the job can only be known through trial and error until the assembly is rigid.270) – Fixation of the assembly on the CNC machine:The same two technicians will transport the assembly to workstation # 2 in order to fix the assembly on the machine table using bolts. This activity may take from half a day up to one whole day depending on the number of trials that have to be done in order to reach the required rigidity at which the assembly is fixed to the machine.280) – Rough milling of left plane of part # 3: An engineer and a technician have to activate the program and survey the automatic milling process to ensure that the milling operation is running smoothly. The cutting tools have to be replaced after certain time intervals. This activity will take from 3 4 days because the left part of part # 3 is the least complex part. According to the life span of the tools and the problems that may be faced in the process of milling a variance of time has to be accounted for.290) – Final milling of left part of part # 3: After the rough milling of the left part of part # 3 a final milling operation has to be done to reach an acceptable surface finish and a pre-final accuracy. This activity may take from 1 2 days. This operation takes less time than the bottom surface because there is less work involved in this surface. As the engineer has to make trials in order to reach optimum speed and feed that result in the desired surface finish, he cannot pre determine a deterministic time span in which the activity can be completed.300) – Inspection of dimensions of the left plane of part # 3: After the final milling operation the engineer has to check the dimensions achieved by this operation. Normally this will take one day, but practically the desired dimensions can not be obtained as planed in the program. So generally this inspection is followed by one or two iterations on the CNC milling machine according to the variance of dimensions the engineer has found. So it can take up to 2 days.310) – Removal of part # 3 from the CNC milling machine: After ensuring that we achieved the required dimensions 2 technicians have to remove part # 3 with its setting from the CNC machine. This is followed up by cleaning the machine and preparing it for following operations. This deterministic activity takes half a day.320) – Manufacturing right plane-setting of part 3 for the CNC machine: In order to work precisely on the CNC machine a setting has to be manufactured on workstation # 1. This setting must be designed after making the programs for the CNC milling machine, because the engineer who designed the program is the one who must take into account the settings required to fit his program. Also raw materials have to be available. Two technicians will take from 10 20 days in order to complete this setting, which will function as a support and a mean of fixation on the CNC machine. Due to the complexity of the design (rigidity, very large and smooth surface area, and a very accurate height) several iterations have to be made to achieve the requirements. The surface area must be grinded on work-station # 9 and the setting must be heat-treated in work-station #4.325) Assembling the right setting with part # 3: After manufacturing the setting, and part # 3 after completing the left plane milling, two technicians will take from 2 – 4 days to assemble part # 3 to the setting by means of bolts and nuts and welding on workstations 5 & 7. The variation in the time is due to the fact that the complexity of the job can only be known through trial and error until the assembly is rigid.330) – Fixation of the assembly on the CNC machine:The same two technicians will transport the assembly to workstation # 2 in order to fix the assembly on the machine table using bolts. This activity may take from half a day up to one whole day depending on the number of trials that have to be done in order to reach the required rigidity at which the assembly is fixed to the machine. 340) – Rough milling of right plane of part # 3: An engineer and a technician have to activate the program and survey the automatic milling process to ensure that the milling operation is running smoothly. The cutting tools have to be replaced after certain time intervals. This activity will take from 3 4 days because the right part of part # 3 is the least complex part. According to the life span of the tools and the problems that may be faced in the process of milling a variance of time has to be accounted for.350) – Final milling of right part of part # 3: After the rough milling of the left part of part # 3 a final milling operation has to be done to reach an acceptable surface finish and a pre-final accuracy. This activity may take from 1 2 days. This operation takes less time than the bottom surface because there is less work involved in this surface. As the engineer has to make trials in order to reach optimum speed and feed that result in the desired surface finish, he cannot pre determine a deterministic time span in which the activity can be completed. 360) – Inspection of dimensions of the right plane of part # 3: After the final milling operation the engineer has to check the dimensions achieved by this operation. Normally this will take one day, but practically the desired dimensions can not be obtained as planed in the program. So generally this inspection is followed by one or two iterations on the CNC milling machine according to the variance of dimensions the engineer has found. So it can take up to 2 days.370) – Removal of part # 3 from the CNC milling machine: After ensuring that we achieved the required dimensions 2 technicians have to remove part # 3 with its setting from the CNC machine. This is followed up by cleaning the machine and preparing it for following operations. This deterministic activity takes half a day.380) First part of manual finishing of part # 3: This activity can be started after completing the milling operations of the four different sections of part # 3. Then part # 3 is transported to work station # 7 where two highly skilled workers will have to manually smoothen the surface of the part using sand paper, grinding stones and powdered towels to achieve a mirror like surface finish. This operation will only reach an accuracy of + 0.05 mm to allow minor deformations during the heat treatment process. This activity will take from 25- 45 days because it is impossible to exactly determine how many times the workers have to go over the surface to achieve required accuracy and surface finish. 390) First part of heat treatment of part # 3: After the first part of manual finishing a technician puts part # 3 in a furnace (work station # 4) where it remains for one day (deterministic time). 400) – Preparing ingot of part # 5 for manufacturing: After the arrival of the raw materials and completing the programs of the CNC machine, a technician will transport the ingot of part 5 to workshop. The packaging will be removed and the ingot will be prepared for manufacturing. It will take about half a day, and delays can occur because it is very difficult to handle an ingot without holders. So, it can take up to one whole day.410) Drilling holes for holders in part 5: The prepared ingot will be drilled on work-station 8 by a technician. Then holders will be introduced to the ingot. This process will take about half a day. As this process is not complicated no delay is expected.420) – Rough cutting of excess material of part 5: After introducing the holders the ingot will go to workstation # 1 where two technicians will have to remove the excess material in order to achieve an approximate contour of the design. This can take from 8-12 days depending on the quality of the tools available in the workshop and fixation problems. This process is very important to facilitate the work on the CNC milling machine. Note that the rough milling of this part takes less time than part # 3. This is due to the fact that this part is less complex and there is less material to be removed.430) Manufacturing top plane-setting of part 5 for the CNC machine: In order to work precisely on the CNC machine a setting has to be manufactured on workstation # 1. This setting must be designed after making the programs for the CNC milling machine, because the engineer who designed the program is the one who must take into account the settings required to fit his program. Also raw materials have to be available. Two technicians will take from 10 20 days in order to complete this setting, which will function as a support and a mean of fixation on the CNC machine. Due to the complexity of the design (rigidity, very large and smooth surface area, and a very accurate height) several iterations have to be made to achieve the requirements. The surface area must be grinded on work-station # 9 and the setting must be heat-treated in work-station #4.435) Assembling the top setting with part # 5: After manufacturing the setting and after removing the excess material of part # 5 two technicians will take from 2 – 4 days to assemble part # 5 to the setting by means of bolts and nuts and welding on workstations 5 & 7. The variation in the time is due to the fact that the complexity of the job can only be known through trial and error until the assembly is rigid.440) Fixation of the assembly on the CNC machine: The same two technicians will transport the assembly to workstation # 2 in order to fix the assembly on the machine table using bolts. This activity may take from half a day up to one whole day depending on the number of trials that have to be done in order to reach the required rigidity at which the assembly is fixed to the machine. This activity depends upon the arrival of the special tools required for the machining process. 450) Rough milling of groove (in part # 5) where part # 4 is fixed: An engineer and a technician will supervise this process on workstation # 2. In this process we achieve an accuracy of +0.1 mm. According to the quality of the cutting tools, the surface finish required and the rigidity of the assembly on the machine, this activity may take from 3 6 days. 460) Rough milling (in part # 5) of contact surface with part # 6: An engineer and a technician will supervise this process on workstation # 2. In this process we achieve an accuracy of +0.1 mm. According to the quality of the cutting tools, the surface finish required and the rigidity of the assembly on the machine, this activity may take from 3 6 days. Note that this activity has no relation with the previous one. But, as the two activities are performed on the same part and cannot be made in parallel one has to proceed the other. It was our choice to choose this sequence.470) – Rough milling (in part # 5) of contact surface with part # 3: An engineer and a technician will supervise this process on workstation # 2. In this process we achieve an accuracy of +0.1 mm. According to the quality of the cutting tools, the surface finish required and the rigidity of the assembly on the machine, this activity may take from 3 6 days. Same note as in the previous activity applies to this activity.490) – Preparing ingot of part # 4 for manufacturing: After the arrival of the raw materials and completing the programs of the CNC machine, a technician will transport the ingoof part # 4 to the workshop. The packaging will be removed and the ingot will be prepared for manufacturing. It will take about half a day, and delays can occur because it is very difficult to handle an ingot without holders. So, it can take up to one whole day.500) Drilling holes for holders in part # 4: The prepared ingot will be drilled on workstation # 8 by a technician. Then holders will be introduced to the ingot. This process will take about half a day. As this process is not complicated no delay is expected.510) Manufacturing of setting of part # 4 for the CNC machine: In order to work precisely on the CNC machine a setting has to be manufactured on workstation # 1. This setting must be designed after making the programs for the CNC milling machine, because the engineer who designed the program is the one who must take into account the settings required to fit his program. Also raw materials have to be available. Two technicians will take from 10 20 days in order to complete this setting, which will function as a support and a mean of fixation on the CNC machine. Due to the complexity of the design (rigidity, very large and smooth surface area, and a very accurate height) several iterations have to be made to achieve the requirements. The surface area must be grinded on work-station # 9 and the setting must be heat-treated in work-station #4.515) Assembling the setting with part # 4: After manufacturing the setting and after drilling the holes of the holders of part # 4 two technicians will take from 2 – 4 days to assemble part # 4 to the setting by means of bolts and nuts and welding on workstations 5 & 7. The variation in the time is due to the fact that the complexity of the job can only be known through trial and error until the assembly is rigid.520) Fixation of the assembly on the CNC machine: The same two technicians will transport the assembly to workstation # 2 in order to fix the assembly on the machine table using bolts. This activity may take from half a day up to one whole day depending on the number of trials that have to be done in order to reach the required rigidity at which the assembly is fixed to the machine. This activity depends upon the arrival of the special tools required for the machining process. 530) First machining in the section (of part # 4) matching with part # 5: An engineer and a technician will supervise this operation which will take place after fixation of part # 4 on the CNC machine. It will take about 2 – 4 days to achieve an accuracy of +0.1 mm. This variance in time is due to unknown number of iterations to be done.540) Drilling the cooling holes in part # 4: The same team will do this activity after the first machining is completed. Due to the large depth of the cooling holes the drilling tool may wear out, so this process may take 1 3 days on work station # 2.550) Drilling the fixation holes of part # 4 with part # 5: Also the same team is responsible for this deterministic activity which will take 1 day on workstation # 2. Note that this activity has no relation with the previous one. But, as the two activities are performed on the same part and cannot be made in parallel one has to proceed the other. It was our choice to choose this sequence. 560) Final finishing of section (part # 4) matching with part # 5: The same team will finish milling this section up to the desired dimensions. No iterations are required here because the matching section in part # 5 is the one to be adjusted to fit this part, so it will take about 1 day in workstation # 2. Same note as in the previous activity applies to this activity.570) – Removal of part # 4 from the CNC milling machine: After ensuring that we achieved the required dimensions 2 technicians have to remove part # 4 with its setting from the CNC machine. This is followed by cleaning the machine and preparing it for following operations. This deterministic activity takes half a day.580) Manual finishing of the section in part # 4 matching with part # 5: Two highly skilled workers will have to manually smoothen the matching surface. Due to the unknown number of iterations this activity will take from 1 2 days in workstation # 7. This short time is due to the fact that the surface is not as large as the surface of part # 3 which took a much longer time.600) Finish milling of the groove (part # 5) in which # 4 will be fit: This activity will be done by an engineer and a technician on workstation #2. It will take from 1 4 days. This variation in time is due to the fact that the number of iterations needed to correctly fit part # 4 is unknown. Of course this activity can start after the manual finishing of the section (part # 4) matching in the groove of part # 5 is done. 610) Drill holes (part # 5) for fixation with part # 4: The same team as in the previous activity will take a deterministic of half a day to finish this job on workstation #2.620) – Removal of part # 5 from the CNC milling machine: After ensuring that we achieved the required dimensions 2 technicians have to remove part # 5 with its setting from the CNC machine. This is followed by cleaning the machine and preparing it for following operations. This deterministic activity takes half a day.630) Assembling of parts 4 & 5: Two technicians will assemble parts 4 & 5 on workstation # 7. This activity will take from 2 4 days because the process of fitting the two is a rather complex one as they have to exactly and rigidly fixed. 640) Fixation of the assembly on the CNC machine: The same two technicians will transport the assembly to workstation # 2 in order to fix the assembly on the machine table using bolts. This activity may take from half a day up to one whole