The Complete Guide to Simple OEE Page 14
6) Do the Simple OEE metric calculations of a machine represent a magical
number?
No. The strength of Simple OEE is that it gives you four metric numbers. These
numbers can be used individually to make decisions as your machine process
changes from day to day. The Simple OEE metrics help you visualize the total
resources of your manufacturing process as it relates to what the machine actually
produced. If your machine produces these Simple OEE metric numbers:
Availability 90%, Performance 85%, Quality 99%, Simple OEE = 76% only you
can decide if these numbers are good or bad. However, if your machine produced
these Simple OEE metric numbers: Availability 98%, Performance 85%, Quality
91%, Simple OEE = 76% are these numbers any better. The Simple OEE metric
stayed the same but is the drop in quality worth the improvement in availability.
Most manufacturers always try to improve quality so they would consider this to
be an unacceptable tradeoff.
7) Is it possible to have to have a Simple OEE metric exceed 100%?
No. If your Simple OEE metrics (Availability, Performance, Quality, Simple
OEE) are greater than 100%, you are not defining something in your process
correctly. You are probably underestimating the capacity of a process when you
input your machine parameters. Most commonly, the Performance metric has not
been correctly calculated when determining your Ideal Cycle Time (Target
Counter Value) of your process.
8) What defines if a machine is producing parts (running)?
For the purpose of measuring productivity, the Simple OEE metric needs to know
if the machine is producing product, even if this product is good or bad. If the
machine is scheduled for production (not in break or planned maintenance), the
production clock is running and the machine is considered producing parts.
9) How do you determine the Ideal Cycle Speed (Target Counter Value) of your
machine?
If the “nameplate capacity” of the machine is available from the equipment
manufacturer, this would give you the capacity data for that particular machine.
If this data is unavailable, you should perform machine calculations to measure
the cycle times and rates of the machine. These numbers will give you a starting
point but may vary depending on machine age and operator training. Take
measurements, experiment, and calculate your own Ideal Cycle Speed (Target
Counter Value).
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