Insights

The hidden reason production lines stop (and it's not what you think)

Soham Harmalkar • March 2026 • 3 min read

When production lines stop, the immediate assumption is a major failure — machine breakdown, critical quality defect, material shortage. These are visible, well-tracked, and well-understood.

But the stoppages that cost the most time and money are often caused by something far less dramatic: packaging, handling, and dimensional drift.

The hidden causes

Over 7 years and 500+ components, I've seen production disrupted more often by these invisible issues than by headline failures:

Packaging failures leading to part damage. A crankcase that passed every inspection arrives at the assembly plant with surface deformation because the container wasn't designed for the stacking pattern used during transport.
Handling variability causing inconsistent assembly. Different operators handle the same part differently. Without defined handling protocols tied to part geometry, assembly variation creeps in.
Minor dimensional variations accumulating over time. Individual parts pass inspection. But when assembled together, tolerance stack-up creates issues that no single part inspection would catch.

Why they get ignored

These problems fall between functions. Packaging sits between engineering and logistics. Handling sits between production and quality. Dimensional drift sits between design and manufacturing.

No single team owns them. They don't show up in standard metrics. And they appear minor in isolation — until they stop a line.

A different perspective

At Bajaj, I treated packaging as part of the PPAP process — not as an afterthought delegated to logistics. Every component I industrialized got packaging specifications defined alongside process parameters: container design based on part geometry, protective interfaces for machined surfaces, stacking patterns, and load limits.

At Mahindra, I coordinated incoming quality across two assembly plants. The issues that caused the most disruption were never the dramatic ones. They were the small things that nobody tracked until they accumulated into a line stoppage.

Production stability is not just about machines and processes. It is about everything that interacts with the product — from the moment it leaves the supplier to the moment it's assembled. Ignoring small factors leads to large disruptions.

I've managed component quality and supplier delivery across four plants at Bajaj Auto and Mahindra & Mahindra. The most valuable lesson: the problems that stop production lines are rarely the ones you're measuring. I'm completing my MBA at HHL Leipzig and writing about what manufacturing engineering looks like in practice.