Overall Equipment Effectiveness (OEE) Basic

What is Overall Equipment Effectiveness (OEE)?

OEE is the ratio of Fully Productive Time to Planned Production Time. It can also be calculated by multiplying Availability, Performance, and Quality. OEE breaks the performance of a manufacturing unit into three separate but measurable components: Availability, Performance, and Quality. Each component points to an aspect of the process that can be targeted for improvement.

OEE will help maintain the ability and effectiveness of the equipment at its best level.

In an earlier article on the general description of Overall Equipment Effectiveness (OEE), it was stated that the OEE hierarchy consists of two top-level steps and four basic steps. This time we will discuss both of them in more depth.

Two Top-Level Steps

OEE and Total Effective Equipment Performance (TEEP) are two measurement methods that serve to determine the effectiveness of the use and utilization of machinery, equipment, time and materials in an operating system in the manufacturing industry. Both are closely interconnected, and will define directly the difference between actual performance (current operating and production status) and ideal performance (targets to be achieved).

OEE will qualify the quality level of the manufacturing unit's performance, related to engine capacity during the scheduled production period. will provide accurate data on the performance of each manufacturing unit.

TEEP measures OEE by comparing it with time range. For example, 24 hours per day or 365 days per year.

Four Basic Measurement Steps

There are four basic matrices, which will provide an understanding of why and when the gap between OEE and TEEP occurs.

Four measurements are:

Loading: A part of a TEEP measurement that represents a portion of the total time that is scheduled to operate.

Availability: A portion of the OEE measurement that represents a portion of the scheduled time when the unit is ready to operate. Often referred to as Uptime.

Performance: A part of OEE measurement that represents the speed at which a Work Center runs as part of its design speed.

Quality: A portion of the OEE measurement that represents Good Units produced as part of Total Units Started. Also known as First Pass Yield (FPY).

How to calculate OEE?

OEE= Availability X Performance Rate X Quality Product Rate

Where,

Loading time – Down time
Availability = ………………………………………. X 100
Loading time

Standard cycle time x Processing quantity
Performance = …………………………………………………. x 100
Operating time

Processing quantity – Defective quantity
Quality product rate = ……………………………………………………………. X 100
Processing quantity

Let,

Working hours per day: 10 hours x 60 min = 600 min

Shut down (SD): 35 min

Loading time: (600-35) = 565 min

Equipment stoppage/ down time: (30+20+25) = 75

(a) Failure : 30 min
(b) Set up : 20 min
(c) Adjustment : 25 min

Operating time : (565 - 75) = 490 min

Standard Cycle time : 0.35 min/ pieces

Processing quantity : 550 pieces/ day

Defective : 30 pieces.

Now,

Loading time – Down time
Availability = ……………………………………………. X 100
Loading time

565 – 75
= ………………….. x 100
565

= 86.72%

Standard cycle time x Processing quantity
Performance = ………………………………………………….. x 100
Operating time

0.35 x 550
= ……………………. X 100
490

= 40.35%

Processing quantity – Defective quantity
Quality product rate = ……………………………………………………………………. X 100
Processing quantity

550 – 30
= …………….. x 100
550

= 94.54%

So, OEE = Availability X Performance Rate X Quality Product Rate

= 0.8672 X 0.4035 X 0.9454

= 33.08%

Low Machine efficiency rate due to man:

Management Losses;

Motion Losses;

Adjustment Losses;

Losses resulting from lack of automation and

Monitoring Losses

Why Use OEE?

Overall instrument efficacy (OEE) can be help to reduce significant unnecessary purchases in organization. Even it help focus on improving the performance of machinery and plant equipment. The OEE Formulas show that changes, quality, machine reliability improvements, works by breakdown and how the lines will improve.

As you are fighting your world-class productivity at your convenience, this simple formula will create an excellent bench marking tool. Received OE Percentage It is easy to understand and display a number where employees can see all the facilities, making it a great inspirational technique. By giving an easy way to see how your employees are doing full-use tools, how they are doing the speed and quality of the product, they will try for a high number!

I recommend using an automated equipment monitoring system with LCD display for your OEE in each relevant area of your facility so that all can monitor. In every field the employee will become normal at the sight as a speedometer on the car. While showing a machine speed with such displays, the machine speed is just a small percentage of the effectiveness of your entire device.