Factory Capacity Analysis: What I Learned About Supplier Capacity

What Is Factory Capacity Analysis?

Factory capacity analysis is used to understand whether a supplier's production capacity can meet the requirements of an order or project.

Different industries and companies may use different methods for capacity analysis. The actual approach should be adjusted according to the product, production process, equipment, and requirements of each project.

I didn't really understand this when I first started working with factories.

A Capacity Problem I Still Remember

One of the most memorable capacity issues I encountered happened many years ago, when I was still working in sales.

A customer visited a factory to check the production situation. After the visit, the customer called me. I still remember that phone call very clearly.

At that time, I was attending a trade show, so I was not at the factory.

Customer: Do you know how many units of Model XX they can produce in one day?

Me: If all the materials are available, it should be around 500 sets per day.

Customer: Do you know how many finished units they produced today?

Only 120 sets.

The customer had looked at the production line and found that there were XX units being reworked or rejected. The average installation time for one particular process was XXX minutes.

After taking into account the time needed for line changes and material changes, even with overtime that evening, the factory could produce a maximum of around 300 sets.

At that time, I didn't really have a clear understanding of factory capacity analysis. Or, to be honest, I almost had no understanding of it.

My simple thinking was that if the factory needed to complete the order on time and with the required quality, they could just add more workers.

But the customer's call helped us identify the production bottleneck for this model in advance. More importantly, we could see where the production process needed to be improved and what potential risks this could create for future order deliveries.

The customer was actually showing a clear concern: the order volume for this model was likely to increase, and the factory needed to be able to increase production accordingly.

Not long after that, the purchasing volume of this model doubled.

Fortunately, we had already increased the production capacity in advance. We improved the production process and reopened the tooling to solve the main production bottleneck.

Looking back, factory capacity analysis was a useful way to address potential concerns and improve production capacity — both for the customer and for me as a salesperson at that time.

Why Capacity Analysis Matters to Suppliers

Capacity analysis can help suppliers address customers' concerns about production capacity.

These days, people often say that if there is a large order, the factory can simply hire more workers and the problem will be solved.

But it is not always that simple.

If the actual bottleneck is a production process, machine, tooling, production cycle time, or another part of the production line, simply adding more workers may not increase the actual production capacity.

Capacity analysis can help identify where the actual bottleneck is and what needs to be improved.

For suppliers, this can also help provide customers with a more realistic understanding of production capacity, especially when they are preparing for larger orders or future volume increases.

Why Capacity Analysis Matters to Buyers

For buyers, factory capacity analysis can help confirm in advance whether a supplier's capacity can meet the requirements of a particular order or project.

It can also help buyers understand whether the capacity promised by the supplier is realistic, and whether the supplier may have already over-sold its available capacity.

This is particularly important when a supplier is working with multiple customers or when a project is expected to increase in volume.

Capacity planning can also be used to confirm whether the supplier's planned production shifts and production cycle time can meet the capacity requirements of the project.

Production data can then be used to verify whether the tooling, production process, and equipment can produce qualified components or finished products at the planned production rate.

This is different from simply asking a supplier:

“How many units can you produce per day?”

The answer to that question may only represent the supplier's stated capacity. Production data and an understanding of the production process can provide a better picture of the capacity that can actually be achieved.

Production Bottlenecks and Capacity

A production bottleneck can come from many different areas.

• A specific production process
• Production cycle time
• Machinery or equipment
• Tooling or molds
• Material availability
• Line changeover
• Material changeover
• Rework or defective products
• Available production shifts
• Labor

This is why capacity analysis should not simply focus on the number of workers in a factory.

In the example I mentioned above, adding more workers alone would not have solved the main problem. We needed to identify the bottleneck in the production process and improve it.

Eventually, we improved the production process and reopened the tooling to address the main bottleneck before the order volume doubled.

That preparation helped reduce the potential risk to future order deliveries.

Capacity Analysis Is Not Only About Full Production

One thing I learned from this experience is that capacity analysis is not something that should only be done when a factory is close to being fully loaded.

It can also help a factory:

• Identify production bottlenecks
• Reduce unnecessary costs
• Optimize production processes
• Improve production efficiency
• Prepare for future order increases
• Better understand production risks

Different industries and companies may have different approaches to capacity analysis. The method should therefore be adjusted according to the actual requirements of the product, supplier, and project.

For buyers, capacity analysis can provide a better understanding of whether a supplier can actually support the required production volume.

For suppliers, it can help identify what needs to be improved before production becomes a problem.

Capacity is not simply a number provided by a supplier. It is something that needs to be understood and, when necessary, verified through the actual production process.