Brass rod through untempered glass....cracking?
Brass rod through untempered glass....cracking?
(OP)
Hello engineers,
I have a fixture designed with 1/4" glass (untempered) and two brass rods going through it, 1/8" diameter. There will be a force downward on the rods, probably max 10lbf total. I'm trying to see if I need to put a bushing in there or rubber, or if I can get away with just the rods going through the hole in the glass. I've never really worked with glass, so this might be a silly question. Any insight greatly appreciated.
Thanks,

Josh





RE: Brass rod through untempered glass....cracking?
> how is the hole made and what is its finish?
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RE: Brass rod through untempered glass....cracking?
The hole will most likely be water jet cut. But possibly drilled. No finishing operations though.
Thanks,
Josh
RE: Brass rod through untempered glass....cracking?
Unless the glass has no surface imperfections loaded by the rods, there would be some likelihood that you might crack the glass.
Is the loading a instantaneous, singular, event, or is it repetitive? How much slop is there between the rod and the hole?
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RE: Brass rod through untempered glass....cracking?
The object is a hook of sorts. So people will hang some weight on it..leave it there... take it off... repeat.
I guess it would be safe to add a layer of rubber or plastic around the rods? Although I'm having a hard time finding an off the shelf bushing with sizing that would work. Do you think a layer of 0.006" rubber is enough to stop potential cracking?
Thanks IRstuff!
RE: Brass rod through untempered glass....cracking?
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Brass rod through untempered glass....cracking?
RE: Brass rod through untempered glass....cracking?
Glass is very unforgiving when it comes to edge loading, alignment, and impact.
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P.E. Metallurgy, Plymouth Tube
RE: Brass rod through untempered glass....cracking?
RE: Brass rod through untempered glass....cracking?
Probably best to bond them in, since the waterjetted surface will be perfectly abraded for bonding. ... and for providing microscopic stress raisers.
You could probably get away with suspending _one_ brass object from a fire-polished hole, but not two.
Mike Halloran
Pembroke Pines, FL, USA
RE: Brass rod through untempered glass....cracking?
If that's 1/4" glass, then those are 1/8" rods, they will be flexible. What happens when they bend inside the hole using the front edge as a fulcrum, and pry upwards towards the middle/back?
How about acrylic instead of glass?
RE: Brass rod through untempered glass....cracking?
Search for bolted glass on Google and you should see some images of other approaches.
I would go with edge clips on tempered glass to avoid the need to drill and to make the acquisition easier.
RE: Brass rod through untempered glass....cracking?
RE: Brass rod through untempered glass....cracking?
Mike Halloran
Pembroke Pines, FL, USA
RE: Brass rod through untempered glass....cracking?
What about polycarbonate/acrylic?
RE: Brass rod through untempered glass....cracking?
Also, the load probably wouldn't be 10lbs, I just set that as an upper limit. It's just for coats, bags, etc. But I guess glass still isn't the best option.
RE: Brass rod through untempered glass....cracking?
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers