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How To Hang A Mirror?

 
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Old 12-20-2018, 06:33 PM   #41
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Re: How To Hang A Mirror?


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Originally Posted by Texas Wax View Post
Point about newtons is that it is not "weight" it a force. Which is weight X acceleration. You need to apply gravity to get the proper results, not just apply trig to the dead weight and angles. The applied tension in a lateral loading situation is distributed trigonometric function, but he did not take into account acceleration. Which makes his math all wrong, even though he did solve the trig relationships properly with the wrong numbers.
This ^^^^ is why I dropped out of Architectural Engineering after the first year.
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Old 12-20-2018, 06:48 PM   #42
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Re: How To Hang A Mirror?


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This ^^^^ is why I dropped out of Architectural Engineering after the first year.
LOL I struggled with Trig in College big time. Wasn't until having to learn to apply it for complex roof framing that I actually GOT IT! SO I ain't all that believe me. But there is no way a 100lbs mirror can exert 450 lbs on the hanging wire, I know that from experience. So I went to my little black book of formulas and magic equations to make sure I wasn't daft
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Old 12-20-2018, 09:06 PM   #43
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Re: How To Hang A Mirror?


Leave the mirror on the floor and lean it against the wall. Call it modern art and collect a cheque.

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Old 12-20-2018, 10:38 PM   #44
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Re: How To Hang A Mirror?


A friend of my wife had a huge house, with a huge mirror on the floor leaning against the wall at the end of the foyer. Stayed there until they moved away.
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Old 12-20-2018, 10:48 PM   #45
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Re: How To Hang A Mirror?


Quote:
Originally Posted by Texas Wax View Post
Point about newtons is that it is not "weight" it a force. Which is weight X acceleration. You need to apply gravity to get the proper results, not just apply trig to the dead weight and angles. The applied tension in a lateral loading situation is distributed trigonometric function, but he did not take into account acceleration. Which makes his math all wrong, even though he did solve the trig relationships properly with the wrong numbers.
You're mixing up weight and mass. But it doesn't matter. I could call them pickles. Think about Robie's mental exercise with the fish. I drew a little sketch. The fish weighs 50 pounds. There are 50 pounds of tension in wire D. There are 450 pounds of tension in wire C. The units are all the same.

The reason you don't see that in real life is because the wire stretches a tad and the hook bends and the screw pulls out of the hole a little bit and now the angle is only 60 degrees instead of 83. But I want to avoid all that bad stuff in the first place.

Long mirrors are a pain in the butt. I know. If your holes are off by 1/8", that gets magnified and one side of the mirror is an inch higher than the other. And it sticks out like a sore thumb next to the baseboard.

If you like the convenience of wire, but you don't want to put undue stress on the hangers, here's a little trick: Use two wires. Connect a short loop of wire to EACH hanger and hook each of those to a screw directly above it. Now the wires go straight up and down so you don't have that obnoxious sideways force. Each one just has to hold 50 pounds. Granted, it's not as easy to adjust, but still doable. In my opinion, if you're hanging something professionally, you don't want it to go crooked the first time some kid hits it with a Nerf gun. So if it a little difficult to adjust, that's not a bad thing. Stick some mounting tape or putty on the bottom corners to keep the bottom from flopping around and collect your check.
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Old 12-20-2018, 10:49 PM   #46
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Re: How To Hang A Mirror?


Quote:
Originally Posted by Texas Wax View Post
Point about newtons is that it is not "weight" it a force. Which is weight X acceleration. You need to apply gravity to get the proper results, not just apply trig to the dead weight and angles. The applied tension in a lateral loading situation is distributed trigonometric function, but he did not take into account acceleration. Which makes his math all wrong, even though he did solve the trig relationships properly with the wrong numbers.


Chenyi’s math and his units are consistent and correct.

Weight is a force. Weight is defined as the force gravity exerts on an object. The SI unit for force is the Newton (kg*m/s^2).

Regardless of what type of force you are referring to (push, pull, thrust, lift, weight, friction, etc..) if you are using the SI system, its units will be Newtons. If you using the English system, then its units will be pounds.

Gravity was “applied” when Chenyi listed the weight (which is the force of gravity) of the mirror as 100 lbs. Without gravity, there is no weight (i.e. in space).

I think you are confusing the difference between weight, which again is a force, and whose units could be newtons or pounds and mass whose units could be kilograms or slugs. If Chenyi had listed the mass (kg or slugs) of the mirror instead of the weight, your explanation would be closer to correct in that to find the force of gravity on the mirror you would need to multiply the given mass by the acceleration due to gravity to find the gravitational force (weight) of the mirror.

Of course if this explanation is too technical or tedious, a much easier verification can be done by googling “what is the SI unit for weight”. The answer will be Newton.


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Old 12-20-2018, 11:23 PM   #47
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Re: How To Hang A Mirror?


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Originally Posted by Wile E Coyote View Post
Chenyi’s math and his units are consistent and correct.

Weight is a force. Weight is defined as the force gravity exerts on an object. The SI unit for force is the Newton (kg*m/s^2).

Regardless of what type of force you are referring to (push, pull, thrust, lift, weight, friction, etc..) if you are using the SI system, its units will be Newtons. If you using the English system, then its units will be pounds.

Gravity was “applied” when Chenyi listed the weight (which is the force of gravity) of the mirror as 100 lbs. Without gravity, there is no weight (i.e. in space).

I think you are confusing the difference between weight, which again is a force, and whose units could be newtons or pounds and mass whose units could be kilograms or slugs. If Chenyi had listed the mass (kg or slugs) of the mirror instead of the weight, your explanation would be closer to correct in that to find the force of gravity on the mirror you would need to multiply the given mass by the acceleration due to gravity to find the gravitational force (weight) of the mirror.

Of course if this explanation is too technical or tedious, a much easier verification can be done by googling “what is the SI unit for weight”. The answer will be Newton.


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Well, I did google it to verify the formula I had. You have to take in effect the force of gravity (acceleration 9.9 whatever per second) in addition to the mass (weight) to find the tension on the wires. So without that it's wrong, but believe what you want. I'm too much of an a$$hole so I'm not a good teacher to explain the equation and that there is no 450lbs of tension on that wire.. Have no patience left for those who don't understand it that way. Sorry.
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Old 12-20-2018, 11:56 PM   #48
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Re: How To Hang A Mirror?


There just happens to be a handy-dandy on-line calculator for such things as hanging mirrors with wire...

http://chcollins.com/100Billion/2017...ging-pictures/
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Old 12-20-2018, 11:58 PM   #49
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Re: How To Hang A Mirror?


Y’all sound really smart and all but I got a better way. https://www.amazon.com/Picture-Hangi...79285277&psc=1

I know when I’m being a dummy and if I couldn’t hang a freaking mirror without a calculator I’d expect to be called a dummy.

Y’all are being dumb.
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Old 12-21-2018, 12:06 AM   #50
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Re: How To Hang A Mirror?


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Originally Posted by WBailey1041 View Post
Y’all sound really smart and all but I got a better way. https://www.amazon.com/Picture-Hangi...79285277&psc=1

I know when I’m being a dummy and if I couldn’t hang a freaking mirror without a calculator I’d expect to be called a dummy.

Y’all are being dumb.
You were the one talking about mathematical calculations. I just posted a link to a calculator.

Calm down.
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Old 12-21-2018, 12:09 AM   #51
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Re: How To Hang A Mirror?


Quote:
Originally Posted by Robie View Post
There just happens to be a handy-dandy on-line calculator for such things as hanging mirrors with wire...

http://chcollins.com/100Billion/2017...ging-pictures/
Quote:
Originally Posted by WBailey1041 View Post
Y’all sound really smart and all but I got a better way. https://www.amazon.com/Picture-Hangi...79285277&psc=1

I know when I’m being a dummy and if I couldn’t hang a freaking mirror without a calculator I’d expect to be called a dummy.

Y’all are being dumb.
Yep .54 of the wight of the mirror on each side at 22.5 degrees. That ain't no 450 lbs.

And while it's dumb he was wrong anyway. And my formula was suited for any load, not just gravity, so yup a little dumbass here too. But there's nothing worse than people who don't really understand formulas yet alone use common sense to see if they might be mistaken. Plus I'm missing the old days of these conversions in bars.

Nite y'all
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Old 12-21-2018, 12:24 AM   #52
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Re: How To Hang A Mirror?


Quote:
Originally Posted by Robie View Post
You were the one talking about mathematical calculations. I just posted a link to a calculator.

Calm down.
Think you mistakenly quoted me, that was my first post in this thread. I never posted or mentioned mathematical calculations.

I’m calm.
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Old 12-21-2018, 02:31 AM   #53
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Re: How To Hang A Mirror?


I had a chance to hang a 50 lb. (?) mirror a month ago. 150 years old.

I punted. Let the glaziers do it. Too little reward for the risk involved.

I think the hard part may be getting the wire to catch the hangers while sliding the mirror down the wall. I was going to tie string onto the two screws/anchors, thread it under the wire on the mirror, and hang the string down the front face of the mirror. Lifting the string while sliding the mirror down the wall would direct the wire onto the screws. Then the string could be hidden behind the mirror.


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Old 12-21-2018, 06:24 AM   #54
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Re: How To Hang A Mirror?


Quote:
Originally Posted by Texas Wax View Post
Well, I did google it to verify the formula I had. You have to take in effect the force of gravity (acceleration 9.9 whatever per second) in addition to the mass (weight) to find the tension on the wires. So without that it's wrong, but believe what you want. I'm too much of an a$$hole so I'm not a good teacher to explain the equation and that there is no 450lbs of tension on that wire.. Have no patience left for those who don't understand it that way. Sorry.
Please post the formula you googled.

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Old 12-21-2018, 09:14 AM   #55
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Re: How To Hang A Mirror?


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Please post the formula you googled.

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Old 12-21-2018, 09:17 AM   #56
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Re: How To Hang A Mirror?


"Hanging a mirror" is just code talk. They is actually design-a-gating a suspense bridge.
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Old 12-22-2018, 07:09 AM   #57
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Re: How To Hang A Mirror?


Quote:
Originally Posted by Chenyi View Post
https://www.youtube.com/watch?v=moSFlvxnbgk



I know a guy named Wai Lee. I can't help but think about Wile Coyote every time I see him.


You made me laugh and gave me some good advice. Much respect Mr. Chenyi.


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