Hello everyone, I am new to the maintenance field and I need assistance in calculating a specific performance indicator for a group of machines. If I have a group of 10 machines and track one indicator (such as MTBF or MTTR) for each machine over a period of time (e.g. one week or one month), how can I determine the overall performance indicator for the entire set of machines? Should I divide the total operating hours by the total number of failures to calculate the MTBF? Or should I find the mean value of the 10 individual MTBF values? Determining the mean value is a common method for estimating averages. Is this method commonly used and valuable in the maintenance field? Thank you for your assistance!
If you're wondering how to calculate the performance indicators MTBF or MTTR for all machines, the process involves dividing the total operating hours by the total number of failures for MTBF.
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MTBF is calculated based on the time between failures, so it is important to adjust the divisor by adding 1 when counting failure events from a previous failure.
Hi there! It's great to see you venturing into the maintenance field. Now, when you're looking to determine an overall performance indicator for a set of machines, the process can be a bit tricky. While it might seem logical to just average out all the individual MTBF values, it won't provide you with the most accurate picture. This is because machine efficiency and working hours can vary significantly. Calculating aggregate MTBF, which involves dividing total operating hours by the total number of failures, as you suggested, would provide a more accurate representation of the overall performance. It's a common method used in maintenance operations specifically because it offers a more holistic view of the system's reliability. However, remember that you should only use it for machines with similar reliability and operational characteristics. Happy calculating!
Welcome to the field and the forum! Your understanding of MTBF (Mean Time Between Failures) is fundamentally right. However, when we're addressing a set of machines, taking the mean of individual machine MTBFs isn't exactly the right way to go. Here's why: each machine might have varying operating hours and failure rates which can skew the average. Instead, aggregate the total operating hours of all machines and the total number of failures in the period you're observing. Then, to get the overall MTBF for the group of machines, divide the total operating hours by the total number of failures. That should give you a more realistic figure.
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Answer: Answer: To calculate the overall performance indicator for a group of machines, you can consider methods like averaging individual machine indicators (e.g., MTBF or MTTR), or calculating a collective indicator based on total operating hours and total number of failures.
Answer: Answer: Yes, determining the mean value of individual performance indicators is a common method used in the maintenance field to estimate averages and assess overall performance of a group of machines.
Answer: Answer: While calculating MTBF for a group of machines, you can consider dividing total operating hours by the total number of failures to determine the average time between failures for the entire set of machines.
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