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MedRxx

(56 posts)
Fri Mar 29, 2024, 11:50 AM Mar 2024

My AI Fail of The Day

Was feeling lazy, so turned to AI for quick answer to how many 17x20” rectangles could be cut from a 4x8’ plywood piece (making shelves).

First asked Perplexity, which has the virtue of showing its references. I was told that: “Based on the search results, the number of 17x20 inch rectangles that can be cut from a 4x8 foot sheet of plywood is approximately 20”

This seemed a bit high, as the area of a plywood sheet is 32 sqft, and 20 17x20 inch pieces is about 47 sqft. Alternative universe I guess.

So tried ChatGPT which confidentially (after explaining how to convert feet to inches) stated that “you can cut 8 rectangles of size 17x20 inches from a 4x8 foot sheet of plywood.”

This is sorta true (as would have been a reply of 1 or 2 or 6).

The correct answer, which I got off my butt and figured out, is 10.

This is using a cut plan of
long edge: 3@20 and 2@17
short edge: 2@17 and 2@20

However, in fairness to ChatGPT, I reframed my question to what I *actually* meant which was “what is the maximum number of 17x20 inch rectangles that can be cut from a sheet of 4x8 foot plywood”

After explaining that “To maximize the number of 17x20 inch rectangles that can be cut from a sheet of 4x8 foot plywood, we need to arrange the rectangles efficiently without wasting much material. This often involves tiling the rectangles in a grid pattern.”

GPT then again gave the previous incorrect answer “therefore, the maximum number of 17x20 inch rectangles that can be cut from a sheet of 4x8 foot plywood while fully utilizing the material is 8”

Also, to be fair, if simply ask the Box Store person to cut the sheet (no way at home for me to cut the plywood), likely would end up with 8. Will take my cutplan and end up with 10—Which I *hope* is correct so don't look to be an idiot.

In any event, doubt that will be going home with TWENTY

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My AI Fail of The Day (Original Post) MedRxx Mar 2024 OP
Perplexity, being perplexed, may have counted both sides of the rectangles as separate pieces . . . Journeyman Mar 2024 #1
There's a free program out there named SketchUp, grumpyduck Mar 2024 #2
Thanks, will check it out MedRxx Mar 2024 #3

grumpyduck

(6,360 posts)
2. There's a free program out there named SketchUp,
Fri Mar 29, 2024, 12:33 PM
Mar 2024

used by architects and many others, which is very very easy to use. It's a combination drafting and 3D modeling program, and I've been using it for many years. You can use it to lay out your sheets and move them around.

MedRxx

(56 posts)
3. Thanks, will check it out
Fri Mar 29, 2024, 12:43 PM
Mar 2024

*Anything* to avoid doing my own thinking—though have finally gotten past my previous "measure twice, cut three time" approach.

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