Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: Glass shelf thickness
02GF74

posted on 10/10/17 at 07:25 PM Reply With Quote
Glass shelf thickness

I've got a hifi rack with 400x465mm toughened glass shelves. They are supported at the corners by resting on small triangular fillets welded to the frame.

I'm trying to find out what thickness of glass I need to support 50kg (actually 42kg with a bit of safety margin)

I'm not finding any data and manufacturers I've contacted are not committing. All I have so far is 4mm is good for 20kg so I extrapolate I need 10mm.

And supplementary question is how can I tell if the corner tabs are strong enough.?

[Edited on 10/10/17 by 02GF74]





Visit China. Meet the child that made your trainers.


View User's Profile View All Posts By User U2U Member
tegwin

posted on 10/10/17 at 08:11 PM Reply With Quote
In its simplest form this is just a bending beam question but with glass instead of steel or wood..

This is for laminated glass so not exactly what you want but might help you out. Sure another 5 mins of googling would find a calculator thats right.
http://www2.dupont.com/SafetyGlass/ja_JP/tech_info/beamCalculator.html





------------------------------------------------------------------------------------------------------------------------
Would the last person who leaves the country please switch off the lights and close the door!

www.verticalhorizonsmedia.tv

View User's Profile Visit User's Homepage View All Posts By User U2U Member
SteveWalker

posted on 10/10/17 at 10:29 PM Reply With Quote
quote:
Originally posted by 02GF74
I've got a hifi rack with 400x465mm toughened glass shelves. They are supported at the corners by resting on small triangular fillets welded to the frame.

I'm trying to find out what thickness of glass I need to support 50kg (actually 42kg with a bit of safety margin)
[Edited on 10/10/17 by 02GF74]


Jesus. I thought my 23.5kg valve amp was heavy enough, what on earth are you putting on it?

View User's Profile View All Posts By User U2U Member
02GF74

posted on 11/10/17 at 05:51 PM Reply With Quote
quote:
Originally posted by SteveWalker

Jesus. I thought my 23.5kg valve amp was heavy enough, what on earth are you putting on it?


Krell ksa 150





Visit China. Meet the child that made your trainers.


View User's Profile View All Posts By User U2U Member
loggyboy

posted on 11/10/17 at 08:27 PM Reply With Quote
Most glass bathroom scales only use thin ish glass. And they take a good 100kg.






View User's Profile View All Posts By User U2U Member
gremlin1234

posted on 11/10/17 at 09:08 PM Reply With Quote
quote:
Originally posted by loggyboy
Most glass bathroom scales only use thin ish glass. And they take a good 100kg.
though they are held up on pillars about 250mm apart, would need thicker glass when its a bigger span

View User's Profile View All Posts By User U2U Member
trextr7monkey

posted on 11/10/17 at 11:02 PM Reply With Quote
Hi
We buy odd pieces of toughened glass for jobs kids make - usulaay coffee table tops and dressing tables etc
Some jobs have used drilled tempered glass as structural members
Small pieces are usually 4 mm and bigger spans 6

We have never had to use 20 mm yet! Sounds like over engineering l
I'm certain your local glass place will have someone who can advise
We usually send a template unless it is a regular shape
Hth
Mike





http://www.flickr.com/photos/14016102@N00/ (cut and paste this dodgey link)

Our most recent pics are here:
http://s129.photobucket.com/albums/p211/trextr7monkey/

View User's Profile E-Mail User View All Posts By User U2U Member
Bluemoon

posted on 12/10/17 at 06:07 AM Reply With Quote
That's a proper class-A amp

You will not need any heating in that room..

[Edited on 12/10/17 by Bluemoon]

View User's Profile View All Posts By User U2U Member
Mr Whippy

posted on 12/10/17 at 11:36 AM Reply With Quote
quote:
Originally posted by Bluemoon
That's a proper class-A amp

You will not need any heating in that room..

[Edited on 12/10/17 by Bluemoon]


will need hearing aid in the future though

View User's Profile Visit User's Homepage View All Posts By User U2U Member   Mr+Whippy 's Aim   Mr+Whippy 's Yahoo
Bluemoon

posted on 12/10/17 at 01:08 PM Reply With Quote
Maybe, class A amps have a low output, as most goes as heat....
View User's Profile View All Posts By User U2U Member
HowardB

posted on 12/10/17 at 01:20 PM Reply With Quote
I agree, I have a pair of 100w amps that keep the cellar nice and warm - they play silence beautifully





Howard

Fisher Fury was 2000 Zetec - now a 1600 (it Lives again and goes zoom)

View User's Profile View All Posts By User U2U Member
02GF74

posted on 12/10/17 at 03:37 PM Reply With Quote
quote:
Originally posted by Mr Whippy

will need hearing aid in the future though


Quite possibly as age is not on my side.
Amp is rated at 150w into 8ohm and doubles as speaker impedance halves down to 2 or maybe 1 ohm!!!!

A tiny Walkman or phone listened to at high volume with headphones will damage hearing just as easily.

I don't turn up the volume too high as it brings on tinnitus.





Visit China. Meet the child that made your trainers.


View User's Profile View All Posts By User U2U Member
nick205

posted on 13/10/17 at 08:47 AM Reply With Quote
02GF74

Appreciate perhaps wanting to keep the look with a glass shelf, but a sheet of stainless could be a more cost effective answer.

Also, does the frame itself have a weight rating? You describe metal corner pieces supporting the shelf - be a shame to overload the frame and end up with the whole lot on the floor!

View User's Profile View All Posts By User U2U Member
flak monkey

posted on 19/10/17 at 05:12 PM Reply With Quote
It does depend slightly on the size of the support pieces but off the top of my head 8mm toughened would be fine. The amp will have 4 feet close to it's corners so the load is quite uniform over the glass with little bending moment.

However if you drop the amp on it, it will break. 10mm laminate would be more robust. And I'd recommend a foam/rubber pad between the glass and the support tab


We've just done some rather cool glass design/install in one of the major airports using a mixture of 12mm and 20mm laminated and toughened glass

https://photos.app.goo.gl/5HJMXtCZKFjfvRHE3





Sera

https://www.facebook.com/sera.jay666

View User's Profile View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [ 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.