Cost per Part, Not Price per Litre: The Real Cost of Metalworking Fluid
The cheap drum often turns out expensive. A simple way to cost fluid together with tooling, sump life and scrap.
Purchasing usually focuses on the lowest price per litre. But the real cost of a metalworking fluid is not the litre price — it is the total cost per part. This view explains why the cheap drum so often turns out expensive.
How much does the fluid really cost?
Cutting fluid is typically 1–3% of total production cost. Yet the same fluid directly affects tool life, surface quality, sump life and scrap — the truly large line items.
Items that enter the cost per part
- —Concentrate consumption: Correct concentration + low leakage = low consumption
- —Tool life: Good lubrication extends insert life and lowers tooling cost
- —Sump life: Long life = fewer changes, less downtime, less waste disposal
- —Scrap / rejects: Poor finish and dimensional drift are direct loss
- —Downtime: Emergency changes due to odour/rust cost production
Three concrete scenarios
- —Cheap emulsion, unmaintained sump: Cheap per litre but goes off in 6 weeks → early change + downtime → expensive per part.
- —Right fluid + measurement routine: Slightly higher per litre but 6 months of clean running → low per part.
- —Wrong lubrication: Insert life 30% shorter → tooling cost erases the fluid saving.
How to calculate it
A simple table is enough: parts machined per month, concentrate consumption, tooling spend, number of fluid changes and scrap. Divide these items by the part count and the real cost appears. In most shops the product thought to be "expensive" is cheaper per part.
Ahmet Ceviz compares on cost per part rather than price per litre. We can calculate your current usage together and prepare a quote.