In this article, you will learn what is the manufacturing speed and how to calculate it correctly according to lean manufacturing techniques and activities. The manufacturing speed is also called production speed, line speed, product speed, etc.
Manufacturing Speed [units per minute], Definition
The manufacturing speed is defined as the number of production units, activities, or items assembled, completed, or done per minute on each process line, machine, or business unit.
Types of Manufacturing Speed
In fact, exist many terms and ways to measure the line speed, depending on your intention and the specific information you are looking for.
Some of the most common terms used to measure the production speed are:
Since the terminology about line speed is not standardized, it has potential confusion, we shall explain in this article some of them!
Takt time Definition
The takt time is the most common term to estimate the manufacturing speed, also called customer takt.
The customer takt is the available work time divided by the customer demand during this time.
Customer Takt = Available Work Time / Customer Demand during available Work Time
The takt time is the average time between customer orders.
The customer can place orders randomly and erratically.manufacturing speed
It can be calculated the takt for a single process or an entire manufacturing system.
But keep in mind that the takt time considers the losses!
This is important to determine if your production line is able to satisfy the customer demand.
Cycle Time Definition
The cycle time is similar to the takt measured in time/part.
However, the cycle time does not include losses! manufacturing speed
It is the fastest repeatable time in which you can produce one part.
It is the theoretical or ideal time necessary per part if everything goes perfect, having no problems, breakdowns, quality defects, or other losses.
Cycle times are usually measured for individual processes, but you can also calculate a system or line cycle time for an entire system.
The throughput is the inverse of the takt time, normally used for actual or target production, and only rarely for the customer demand.
Throughput= Parts Produced during available Work Time / Available Work Time
The throughput includes losses and it is measured as parts/time. manufacturing speed
Lead Time Definition
The lead time is the time necessary for a single part to go through the entire process or system.
Inventory = Throughput x Lead Time
The lead time is important if you want to know if you can deliver on time. manufacturing speed
Instead, the takt/cycle times are important if you want to know if you can produce enough.
For example, If the cycle time is acceptable but the lead time is not, then you will have enough products but too late.
On the other hand, if the lead time is acceptable but the cycle time is not, you will build up unprocessed orders which increases your lead time, and hence you will have neither enough nor on time.
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