our trim plate lesson rejects the window reflection

NathanBarnes0547 · 25 Mar 2026, 19:12 UTC

Reply to discussion
NA
NathanBarnes0547
I was preparing a lesson from our proposed FR5 trim-plate inspection and caught myself telling a student the broad pale stripe was damage. Then we turned the same plate slightly and the stripe wandered off. Great teaching moment, for me rather than them. We haven't commissioned this. I've stopped using that picture as a reject example, but the folder has other photos taken beside the workshop window and I don't trust their labels either; how do I give the vision person something useful without spending another session confidently teaching rubbish?

19 replies

BE
BethChan1107
Replying to NathanBarnes0547

Who judged those plates physically, Nathan? I'd want that answer before choosing replacement teaching pictures.

8 points
GR
GraceBell0668
Replying to NathanBarnes0547

The window stripe sounds familiar. Is it crossing the brush direction, or are people also calling the normal finish lines scratches?

9 points
NO
NoraAdams0148
Replying to NathanBarnes0547

Our rejected cover had a real scratch beside a moving reflection. Don't throw out a rejected part just because the brightest thing moved.

16 points
NA
NathanBarnes0547
Replying to BethChan1107

Beth, quality judged the retained plates but I copied the image labels from a draft; Grace, yes, one caption also calls the ordinary brushed finish scoring, so I've managed two different bad examples.

9 points
LU
LucaCarter0961
Replying to NathanBarnes0547

Use the retained plates beside the originals first. Cheap check. I once spent ages trying to understand a lesson picture before someone admitted the part in the box wasn't the one in the slide.

6 points
WE
WendyBriggs
Replying to NathanBarnes0547

Can the vision person reproduce your window-lit photo, or did nobody note which way the plate was held?

20 points
NI
NinaBrown0936
Replying to NathanBarnes0547

I'd fix the captions before chasing that exact photograph. You already know one caption describes ordinary finish as damage. No new light required to correct that.

9 points
BE
BethChan1107
Replying to NinaBrown0936

Yes, but Wendy's question helps explain why the other images disagree. Correct labels and useful imaging are both needed.

11 points
NA
NathanBarnes0547
Replying to WendyBriggs

Wendy, there are no pose notes; Nina and Beth, I've asked quality to go through the retained plates with me first, then we'll give vision the matched originals without treating the window photos as a repeatable setup.

4 points
GR
GraceBell0668
Replying to NathanBarnes0547

Take the perfectly ordinary brushed one along too. Easy to show all the ugly examples and forget what should pass.

-2 points
NO
NoraAdams0148
Replying to NathanBarnes0547

And leave any doubtful feature undecided until quality settles it. A question mark is better than another confident arrow.

15 points
NA
NathanBarnes0547
Replying to NoraAdams0148

We've matched the plates now: the wide stripe belongs to an accepted plate, and the rejected plate has a small edge scratch that barely shows in my chosen photo; thanks, Nora, your example stopped me dropping that one.

19 points
LU
LucaCarter0961
Replying to NathanBarnes0547

That's worth putting in the lesson. I would remember seeing the wrong bright thing much better than a page telling me reflections can be misleading.

7 points
NI
NinaBrown0936
Replying to LucaCarter0961

Provided the student also sees where the actual scratch is. Otherwise it becomes a guessing game with better commentary.

20 points
LU
LucaCarter0961
Replying to NinaBrown0936

Yep, physical plate and matched picture together. Should've said that.

20 points
NA
NathanBarnes0547
Replying to LucaCarter0961

I've replaced the reject slide with that paired example and removed the scoring caption from the accepted finish; vision is taking these plates into a controlled-light comparison, not inheriting my window arrangement.

3 points
WE
WendyBriggs
Replying to NathanBarnes0547

Who will load the plates for that comparison, and will they be able to repeat the same presentation?

13 points
BE
BethChan1107
Replying to NathanBarnes0547

Nathan, will the corrected lesson be the one your colleague gets too? Shared folders can have surprisingly private improvements.

16 points
NA
NathanBarnes0547
Replying to BethChan1107

Beth, yes, we opened the updated lesson from the shared teaching folder together; Wendy, our fixture person is sorting the presentation with vision, and I haven't seen that arrangement yet.

11 points

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