Start with the machine that sets the pace
A German machinery plant can have empty assembly bays and still be at full stretch on its precision grinders. A quarterly industry survey measures what managers say about utilisation across plants; it cannot identify the bottleneck at a particular factory. Compare the German capital-goods series with its own history, then read the order book and production answers separately. An order-book balance is the difference between shares of responses; it is not a count of machines waiting to be built.
Translate idle hours into unit costs
Consider a plant with €2.4 million of fixed manufacturing costs per quarter and practical capacity of 1,000 identical units. At 800 units the fixed cost is €3,000 per unit; at 700 it is about €3,429. The €429 difference is a volume effect before changes in materials, prices or mix. It does not establish an inventory carrying value under accounting rules. If the lost units carried particularly high margins or needed little machinery time, an average-unit calculation will obscure the real change.
Read the next quarter against the diagnosis
If orders recover while utilisation stays low, inspect the interval between an order, an approved design and a scheduled production slot. Missing components, a delayed customer acceptance test or holidays can keep a machine idle despite firm demand. Conversely, high utilisation alongside falling orders may indicate work on an old backlog. For analysis of earnings, compare factory hours with units shipped and changes in finished goods before assuming that extra output has become revenue. For bespoke machines, a single postponed acceptance date can move a quarter’s earnings without materially changing how busy the factory is.
Practical check
Use utilisation to identify the constrained process; use shipments and inventory to test whether running it harder released cash.