## 5 Discussion
The disadvantage is that in the event of illness, leave, or other employee absence, it would be difficult to meet the production line's requirement to deliver eight pallets per hour. Also, in the event of a breakdown of a tractor or transport unit, it would be difficult to deliver the required number of pallets to the production line, causing production downtime. The second option would be to deploy autonomous mobile robots for the supply process from the warehouse to the production line and back. After describing the supply method in detail, we needed to determine how long it would take the robot to satisfy the production line's requirement to deliver eight pallets per hour. After calculating this, we found that one robot would perform the process in approximately 24 min, which implies that one robot could perform the process twice, or in 48 min. For the remaining 12 min, the robot could perform half the process, or it could charge for those remaining 12 min. If the robot worked for the remaining 12 min, it would be able to perform the half process; that is, it would move one more pallet from the warehouse to the production line. The advantage of performing the half process is that for every second hour, it would add one extra pallet to the production line. To meet the production line's demand, the company would deploy four robots for this process. By deploying four robots, the company would have to spend approximately EUR 220,000 at a time. The cost would also include the purchase of a tablet of EUR 3000, two chargers of EUR 30,000, (EUR 60,000 in the case of four chargers) and a wireless box for approximately EUR 5000. The company is also counting on annual service costs of around EUR 10,000. In total, the company would have to spend EUR 268,000 (two charging stations) or EUR 298,000 (four charging stations) for the second option. The second option appears to be more efficient, with high flexibility, as the robots can work continuously for 8 h. In the event of a failure of one of the robots, the remaining three robots would be able to meet the demand to deliver the required number of pallets to the production line. The cost of deploying the robots is higher than that of deploying employees and handling equipment, but if the company opts for two charging stations, the difference between the two options would be only EUR 22,000. If the company opts for four charging stations, it will have to spend approximately EUR 52,000 more. The company will also save approximately EUR 120,000 per year in personnel costs if it deploys robots for the process of supplying the production line. Other benefits of deploying robots are that the process of mechanically moving material from the warehouse to the production line by warehouse employees using material handling equipment is eliminated. The deployment of robots will result in a saving in the number of direct employees involved in the creation of the final product and will ultimately lead to a possible reduction in the final price of the manufactured product. There may also be a benefit in time savings, as the employee will not be performing the activity of moving material from the warehouse to the production line. This activity will be transferred to the robots. The role of the employee in the warehouse would only be picking the required material based on the generated kanban card. While the robot would be moving the material towards the production line, the employee could pick more material in that time. The company should automate this process of handling to the production line and removal of empty pallets by deploying robots, which will not only save employees and time, but also streamline operations and eliminate errors in the implementation of the handling and inventory process. Our proposed procedure for implementing an autonomous mobile robot is unique in that it can be used in any manufacturing plant for any material supply process. Future work could address battery life and recharging capabilities.