Things go wrong on lines. That’s not really news.

A coating starts looking a little rough. Parts stop coming out water-break-free. A customer flags something. Suddenly the whole team is in problem-solving mode, trying to figure out what changed and how to fix it before the next shift.

And in that moment, the question that matters most is: what did this look like when it was running right?

What was the rinse conductivity? What were the spray pressures? What did a good panel out of the conversion stage actually look like?

If those questions are hard to answer, it’s worth asking why. Nobody’s thinking about documentation when everything’s working. There’s nothing to fix. Why bother? But that’s exactly the stuff you’ll need later.

That’s where baseline testing comes in. You establish what your metrics look like when the line’s behaving, so you can spot when something’s off.

It doesn’t have to be complicated. Write down what your line looks like when it’s running right. Update it regularly. Keep it accessible.

And the point isn’t to make troubleshooting fancier. (Nobody needs that.) It’s to make it shorter. Faster. Less stressful. When something drifts, you’ve got last month’s numbers to put next to today’s.

Your Starting Point

The table below covers the three things a good baseline needs—your chemistry, your equipment, and the parts coming off the line. It’s a starting point. Every line has its own quirks and customer-specific requirements that’ll add to it. But get this in place and you’ve got something to compare against when things start going south.