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Donovan Brooke group: registered: GMT - 05/09/2007	Subject: First work Stylizing float glass
	Hello, I thought I'd post this because it is my very first effort at texturizing float glass. The bubble was a nice mistake... haven't decided on a use for it as of yet. So, for now, it makes for an interesting table. Donovan
	DATE: GMT - 06/02/2006 | 07:21 AM         |     QUOTE
David Williams group: registered: GMT - 10/06/2007	Subject: Re: First work Stylizing float glass
	There are a bunch of issues with the physics of flat glass going on there Donovan. There are a number of choices to avoid this, and specific causes, if you're interested. Basically the simple answer for success is to do this with something thicker, make sure your shelf is flat (check w/ straitedge), do a long soak at 1125, (for float, 1075 for artglass) do a slow ramp up to process temp which for your purposes would be right around 1500 for float. Lower, if possible. Depends on your kiln and what you're after. All of those things would garauntee success, but you could add just a few of those steps in combination to work your way around the problem. The biggest thing is, do the long soak at 1100 and a slow ramp to as low a process temp as possible. Also you will want to put borax solution on the top--avoiding the sides and bottom--before you fire. David
	DATE: GMT - 10/23/2007 | 03:29 AM         |     QUOTE
David Williams group: registered: GMT - 10/06/2007	Subject: Re: First work Stylizing float glass
	ps looking closer i can see your glass is plenty thick enough. Your ramp must have been WAY too fast and your process temp too high...D
	DATE: GMT - 10/23/2007 | 03:32 AM         |     QUOTE
Donovan Brooke group: registered: GMT - 05/09/2007	Subject: Re: First work Stylizing float glass
	David, what happened was I using a friends kiln and cooking overnight... couldn't get to the kiln to check it.. so my process was too hot or too long, the glass started to slide... once it peeked over the edge of the kiln shelf, it grabbed some air.. and poof. :-) Donovan
	DATE: GMT - 10/24/2007 | 08:24 AM         |     QUOTE
David Williams group: registered: GMT - 10/06/2007	Subject: Re: First work Stylizing float glass
	You're lucky to not be replacing the friends kiln floor. But your scenario is wrong, with all due respect. what happened was, the bubble was growing and lifting off the shelf, it was the reason the glass went off the shelf, not vice versa. I can explain to you in detail why they form, but that's another post. As the bubble grew and expanded, it slimed over the side. I've seen it many times. These bubbles only form when there is a sealed pocket...they won't "catch air" and form. That would neccesarily imply an unsealed pocket. DW
	DATE: GMT - 10/25/2007 | 01:23 AM         |     QUOTE
Donovan Brooke group: registered: GMT - 05/09/2007	Subject: Re: First work Stylizing float glass
	We'll, perhaps. I've sure been wrong before. Both you and I were not there, so we didn't have a eye sight into the happenings of the glass. I did however, have the chance to look at how the shelf paper moved, where the edge of the glass hit the side wall..etc.. Based off of what I saw, it appeared to me that one corner pinched/grabbed the shelf when it was starting to slide off the vermiculite shelf. This is where I speculated air was able to get in. I think it then sealed itself when it continued to edge over the side. The pinch/grab was apparent because it was where the shelf paper was destroyed... and where the glass "grabbed" the vermiculite. That's my hunch from what I saw, but again, I don't know because I wasn't watching it. I think we can agree my process was off. ;-) Donovan
	DATE: GMT - 10/25/2007 | 04:32 AM         |     QUOTE
David Williams group: registered: GMT - 10/06/2007	Subject: Re: First work Stylizing float glass
	I've gotten to the point where I can look at almost any kiln glass failure and tell you exactly what went wrong and the physics and processes involved. Almost. I've been a student of kiln glass for many years now. In fact I coined the phrase "kiln CSI" over at Warmglass, and then a few months later Bullseye was teaching a class called....guess. Typical. Anyway I'm pretty good at it. People treat kiln failures like mysterious events but they are very predictable and have very identifiable stages and behaviours. But you have to watch for many hours of process temps through a peephole and do alot of firings very carefully and do alot of experimentation. That's why hot guys usually aren't that into kiln firing. Its a whole different skill set.
	DATE: GMT - 10/26/2007 | 03:56 PM         |     QUOTE
David Williams group: registered: GMT - 10/06/2007	Subject: Re: First work Stylizing float glass
	Ps I want to take those last two posts back.
	DATE: GMT - 10/26/2007 | 04:04 PM         |     QUOTE
Donovan Brooke group: registered: GMT - 05/09/2007	Subject: Re: First work Stylizing float glass
	:-) David, I appreciate the punny error, but I had to delete your second post... remember this is a public forum, (open to everyone including kids).. so that last post was a bit past the threshold (I'm sure you understand). I do welcome your skill set to the forum however!... lez just keep the comments within reason. Donovan
	DATE: GMT - 10/26/2007 | 04:54 PM         |     QUOTE
David Williams group: registered: GMT - 10/06/2007	Subject: Re: First work Stylizing float glass
	You're right of course. And besides nobody needed to be reminded once again of the homoerotic language of the hotshop. Its kind of creepy. I think I might rename all my questionable tools and phrases. So like, tomorow I'll go in and tell my assistant (the wife) to 'nib-off the gizzle-wizzle. Then place the armature within the inferno.'
	DATE: GMT - 10/26/2007 | 01:52 AM         |     QUOTE
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