glass box build feedback please

[keep_hope_alive Premium Member]

I def think the glass is for the smooth interior of the wall. I imagine if he waxes it he will gain a few 10ths

ah ha. thanks for the insight.

 

[helotaxi 5,000+ posts]

then why did he talk about polycarbonate? read more, talk less

Learn to read and comprehend.

What I was wanting feedback on is the use of glass on the inside. Automotive grade safety glass bonded to the birch with body panel adhesive or ¾” polycarbonate instead of glass. Have any of you tried this or know of someone who has done the insides with glass?

Now where in that did you get "window?"

 

[SuperJay 10+ year member]

Automotive grade safety glass or polycarbonate....

 

[nateberrier 10+ year member]

I definitely think this is for the purpose of making the box more rigid and to better reflect the sound.

 

[helotaxi 5,000+ posts]

Automotive grade safety glass or polycarbonate....

Did you read any of the other words that were there? The word "inside" catch your eye? He only used it twice.

 

[keep_hope_alive Premium Member]

yea, i can see the difference between an inside layer and a window now. seems like a lot of effort in lieu of concrete...

 

[sexy 10+ year member]

Hey guys I am sorry I did not follow up on this topic for a couple of days. I was at regional finals for DB drag and a usaci event. The reason for glass or polly is so I don’t have as much sanding on the inside of the box when I am finished. It is not for rigidity because the box is already going to be 4 to 6 layers thick of the birch ply. Yes it is a comp box build 70hz

 

[ramos 5,000+ posts]

I see what your getting at, glass on the inside = smoother airflow. Problem I'm seeing is the bonding of the glass to the substrate ( wood). Glass and or polycarbonate are going to be difficult to bond to the wood with a strong enough bond not to rattle lose and negate any effect on smoothing the air flow. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[sexy 10+ year member]

I see what your getting at, glass on the inside = smoother airflow. Problem I'm seeing is the bonding of the glass to the substrate ( wood). Glass and or polycarbonate are going to be difficult to bond to the wood with a strong enough bond not to rattle lose and negate any effect on smoothing the air flow. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

your prolly right i dont realy see how fiberglass stays bonded to wood either and i hate sanding.

 

[snoopdan 5,000+ posts]

I tried the same idea, but with marble and it worked out great. You can actually buy liquid nails that bonds with wood/marble which is what I did for my 65 hz marble box that was doing 155+ with one 18"

 

[ramos 5,000+ posts]

your prolly right i dont realy see how fiberglass stays bonded to wood either and i hate sanding.

Resin seeps into the pores of the wood. Porous surfaces are easy to adhere to. Glass on the other hand.....//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[helotaxi 5,000+ posts]

Polycarbonate would be the better choice. You could hit with some 80 grit to rough the surface up and then attach it with epoxy resin.