Primitive Archer

Main Discussion Area => Flintknapping => Topic started by: DELTA_WOLF on April 06, 2019, 03:00:11 pm

Title: is tempered glass any good
Post by: DELTA_WOLF on April 06, 2019, 03:00:11 pm
so i know if i try knapping it it will break into a bunch of peices but if i cut it to size and then pressure flake it for an edge would it be good? its the tabletop/shelf stuff.
Title: Re: is tempered glass any good
Post by: 1442 on April 06, 2019, 09:17:20 pm
I don't think tempered glass will work at all.
If it breaks into big pieces or if you can cut it to size it should work but that wouldn't be tempered glass.
I saw a 3/8" thick round glass table top for sale for 30 bucks but I didn't know if table tops where tempered or not.
Title: Re: is tempered glass any good
Post by: DELTA_WOLF on April 07, 2019, 08:57:22 am
im 90% shure it is
Title: Re: is tempered glass any good
Post by: Deerhunter21 on April 07, 2019, 03:31:43 pm
just use normal glass!  ;D
Title: Re: is tempered glass any good
Post by: DELTA_WOLF on April 07, 2019, 05:16:09 pm
ok ill see if i can find some sheets
Title: Re: is tempered glass any good
Post by: GlisGlis on April 07, 2019, 10:07:27 pm
bottle bottom are good if thick enough
Title: Re: is tempered glass any good
Post by: Pat B on April 08, 2019, 02:17:08 am
Go to your local glass company and get scraps. Lots of 1/4" glass there.
Title: Re: is tempered glass any good
Post by: jareddchazen on April 27, 2019, 05:11:06 pm
I work in stained glass as my day job, nice endless supply of arrowhead material...we even run large flakes for Dalle de Verre windows. Tempered glass is good for shelves and bathrooms. Even if you could flake tempered, it wouldn't have a reasonably sharp edge. It's specifically designed to not.

Besides Dalle flakes, I've used bottle bottoms, 1/8 double strength, and pre-cut then pressure flaked colored glass for arrowheads.

JH
Title: Re: is tempered glass any good
Post by: 1442 on April 30, 2019, 07:22:19 pm
I love stained glass
1/8 double strength, is that like a stronger glass twice as hard to break.
Title: Re: is tempered glass any good
Post by: mullet on May 01, 2019, 10:04:40 am
I've gone to Walmart and bought cheap, colored plates.
Title: Re: is tempered glass any good
Post by: Stoner on May 09, 2019, 04:29:13 pm
I go to Goodwill Stores and look for colored glass jars, plates, etc. John
Title: Re: is tempered glass any good
Post by: vinemaplebows on May 21, 2019, 05:11:43 pm
Got some of the old ashtrays to try..
Title: Re: is tempered glass any good
Post by: jareddchazen on June 25, 2019, 04:41:20 pm
@1442 1/8" Double Strength (or just DS) is mostly used for windows and cabinets. Single Strength is 3/32" and used in light applications like picture frames. Not actually double the strength, but in full 4x8 foot sheets, SS is definitely more flexible. DS can be used in knapping, I use it all the time, but you'll generally want to cut it preformed only a little larger than the point you want to make since you have to treat the edge like a mini-slab. 1/4 plate is best to work with, I've learned a lot about turning that 90 degree cut into an edge with it. My favorite to knap is the flakes we take off of dalle de vere slabs. 6x12" and 1" thick. We flake them with hammers and toss the flakes, I always grab a small box full so I've got all kinds of colors. They're flat on one side but can be worked easily and the top "hump" thinned down. I'll make a new post showing those. If you have a stained glass studio near you, go in and ask if they do dalle de vere windows and if they have any of the garbage flakes. Most likely get them for free as they normally just go in the trash.
Title: Re: is tempered glass any good
Post by: Zuma on June 27, 2019, 08:01:36 am
tempered or plate  glass is great for knapping  table tops, store windows
 sows
Title: Re: is tempered glass any good
Post by: jareddchazen on June 28, 2019, 04:22:15 pm
Tempered and plate are not the same. Tempered is a safety glass, similar to the side and rear windows in a car. It cannot be scribed and cut and if you impact the edge it will shatter into thousands of tiny pieces.

Safety note, if you have a table top that is plate and not tempered glass, get rid of it. If it breaks while your legs are under it you risk shards going into you legs and feet. Only use tempered glass for tables.
Title: Re: is tempered glass any good
Post by: Zuma on June 29, 2019, 04:59:40 pm
I stand corrected. Plate dates back so far I did'n't think it had safety glass features.

 Thanks for keeping me straight,
Zuma
Title: Re: is tempered glass any good
Post by: jareddchazen on July 02, 2019, 08:48:10 pm
No worries. More than anything, I don't want someone getting any tempered glass and end up with a surprise at their feet or, worst case, wasted money.

To be fair, I saw someone once refer to heat treating glass as tempering it. Which wasn't a correct assessment. Tempered glass is heat treated and cooled in a way to give it its structure to shatter the way it does. He was referring to heat treat to harden and make it more brittle.

Interesting note, not all colored glass knaps the same. Blues are best. Yellows and greens can be really hard. When we cut slabs in our shop, yellows and greens cut really, really slow on the wet saw.

Jared