Left my boss's marker note up for a week before saying anything

I ran into somthing similar last year when a junior programmer left a note on the job traveler for a batch of shafts we were running on the Haas lathe. The note simply said 'measure before you cut,' pointing to a section of the drawing where the depth of cut wasn't fully specified. It was just a quick piece of advice, but it left out the context that the part was already held in a specific chuck setup that restricted certain measurements. I went ahead and took the dimension they needed but realized the note was likely pointing out a potential measurement issue later in the process. It took me a minute to figure out exactly which plane he was referring to, because he meant the final diameter check, not the raw stock measurement. It ended up being a good reminder that even quick comments can lack the necessary shop context or process understanding.

My boss had to go back in and clarify what he meant because he was rushing between jobs and forgot the setup details that made the instruction ambiguous. He was trying to prevent us from running a job out of spec because the drawing itself had a known variance. It really highlighted how important it is that even when you're just trying to offer a quick tip, you specify what part of the operation you are talking about, whether it's the facing pass or the final turning pass. Those little scrawled notes are often shortcuts that cause bigger headaches if they aren't fully understood by the operator.

I ran into something slightly different a few years back when we were running a batch of 4140 shafts for an OEM. The setup was pretty routine, but the paperwork had a vague instruction scribbled in the margin that just said 'dress the lead.' It seemed like minor advice, but it wasn't clear if they meant the lead-in taper on the chuck, or the actual facing operation, or maybe the final pass on the roughing cut. We tried the facing operation first, but the lead taper wasn't properly seated because the operator was rushing based on that ambiguous note. We had to pull the whole setup back, realign the fixture, and run a second fixture check. It wasn't a matter of spelling a word wrong, but just the way the instruction was worded, it completely threw the entire flow for the afternoon. It showed me that even if the intention of the note was helpful, if it doesn't specify the geometry or the operation being referenced, it's just going to create doubt and wasted time, which is worse than a minor typo.

We've got a note on our board from about six years ago that says 'CHECK DEPTCH' in the old owner's handwriting. He retired, we kept the board, and now it's basially shop lore. New guys ask about it and someone tells them the story of the aluminum job he scrapped. I say leave the typo. A note with a mistake in it that still got the job done right beats a clean note nobody remembers.