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Why Frames Tilt Forward (2015)

chcollins.com

11–20 of 49 posts

Re: Why Frames Tilt Forward (2015)

#11
> Because the calculation requires iteration (i.e., the answer cannot be found simply by plugging in the known quantities), I had thought this was impractical.

Since you know, computers are famously bad at iterating. (Hint: they are not)

Re: Why Frames Tilt Forward (2015)

#12
post #11

> Because the calculation requires iteration (i.e., the answer cannot be found simply by plugging in the known quantities), I had thought this was impractical. Since you know, computers are famously bad at iterating. (Hint: they are not)

GP should name his method the "Runge-Kutta" ;)

Re: Why Frames Tilt Forward (2015)

#13
post #9
post #3

TL;DR - because the wire attachment point is usually to the rear of the center of gravity.

And it's hard to fix without poking something through the wall that you probably want to keep pristine, because glass weighs a lot. Unless you modify the frame. Or screw into the top of the frame. Or loads of options that aren't taken for one reason or another because "the frame has a wire across it" is utterly dominant.

Slight forward tilt can be desired, eg. to help with dust accumulation.

Re: Why Frames Tilt Forward (2015)

#14
post #9
post #3

TL;DR - because the wire attachment point is usually to the rear of the center of gravity.

And it's hard to fix without poking something through the wall that you probably want to keep pristine, because glass weighs a lot. Unless you modify the frame. Or screw into the top of the frame. Or loads of options that aren't taken for one reason or another because "the frame has a wire across it" is utterly dominant.

And just you wait until the author of the article tries to work out why the wire isn't straight across but has a bend in it when the painting is hanging on a hook.

The tension on cable strung between two points is a function of the weight pulling down on it, and the reciprocal of the sine of the angle the cable makes where the weight hooks on. For it to be straight, the latter becomes infinite...

Re: Why Frames Tilt Forward (2015)

#16
post #3

TL;DR - because the wire attachment point is usually to the rear of the center of gravity.

My naive answer to this problem would be "well, then don't use a wire to hang them, use something that forces the frame against the wall". Which leaves you with the issue that the frame might pull the nail out of the wall - but that also seems to be a solved problem: you can either use special picture hanging hooks which have up to 3 nails, with the nails angled upward so they won't be pulled out by a force facing downward. Or you can overengineer it and use a wall plug. This might not solve the author's problem, who seems to swap the pictures around often, but I assume most people don't do that...

Re: Why Frames Tilt Forward (2015)

#18
And this is why I just don’t hang pictures like this. Instead, I put a pair of eyehooks on the inside of the frame, a pair of picture hooks on the wall, and just slot it on. For heavy works, mirrors weighing 100kg+ etc., I use heavier duty fittings, but the same method.

Re: Why Frames Tilt Forward (2015)

#19
This sentence is very funny to me: "Most people in the Northern Hemisphere hang their pictures on a wall."

I guess OP did some research but perhaps wasn't exhaustive and didn't want to generalise to below the equator. People write funny and quirky things. I'm glad things like archive.org exist to save the quirkiness for future generations.

Re: Why Frames Tilt Forward (2015)

#20

This sentence is very funny to me: "Most people in the Northern Hemisphere hang their pictures on a wall." I guess OP did some research but perhaps wasn't exhaustive and didn't want to generalise to below the equator. People write funny and quirky things. I'm glad things like archive.org exist to save the quirkiness for future generations.

Or maybe the author is not discarding the hypothesis that, in the southern hemisphere, frames tilt backward due to the Coriolis effect ;)
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