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by Brad Walker
Wed May 11, 2022 7:56 am
Forum: Techniques and Tools
Topic: Slump schedules : Ripples, Twists & Grooves
Replies: 3
Views: 48

Re: Slump schedules : Ripples, Twists & Grooves

I've always believed that a manufacturer should suggest firing schedules for the molds they sell. If nothing else, they would give you a starting point for your tests. As Kevin says, every kiln is different. I would try the schedule that worked for you on a similar mold, take good notes, and adjust ...
by Brad Walker
Tue May 03, 2022 3:40 pm
Forum: Techniques and Tools
Topic: fusing sheets together
Replies: 8
Views: 101

Re: fusing sheets together

Thinking about it, you may be able to join them together side by side with no overlap if you dam the pieces so they can't move apart. I know this works for pieces that are thicker than 6mm, but with 5mm you may not get enough movement for it to work.

Worth a try, if you're experimenting.
by Brad Walker
Tue May 03, 2022 1:54 pm
Forum: Techniques and Tools
Topic: fusing sheets together
Replies: 8
Views: 101

Re: fusing sheets together

Are you trying to fuse two pieces together edge to edge? If so, that's not possible with 5mm glass without overlapping. My guess is that no matter the size of the overlap you'll still get a bump and probably some distortion of the piece because of the temperature you'd need to fire at to minimize th...
by Brad Walker
Mon Apr 04, 2022 3:15 pm
Forum: Techniques and Tools
Topic: Engraving signature on white fused glass art
Replies: 4
Views: 252

Re: Engraving signature on white fused glass art

Rub some acrylic paint in the area you engraved. The paint will go into the engraved area and you can wipe the rest off the surface.

Use any color except white, of course!
by Brad Walker
Tue Mar 22, 2022 8:06 am
Forum: Techniques and Tools
Topic: Can I fix devit on tack fused tekta with powder?
Replies: 3
Views: 249

Re: Can I fix devit on tack fused tekta with powder?

It would require a hotter temperature. You have got to get hot enough to shine up the layer of powder, most likely 1400F or higher. And, yes, if you did you'd want to apply powder to the entire piece, not just the problem area. Only one or two grains thick of powder, more and you risk cloudiness fro...
by Brad Walker
Thu Mar 17, 2022 2:33 pm
Forum: Techniques and Tools
Topic: Opinions re: 6.5" deep kiln models
Replies: 6
Views: 367

Re: Opinions re: 6.5" deep kiln models

All things being equal, I'd always opt for the bigger kiln!
by Brad Walker
Thu Mar 17, 2022 7:31 am
Forum: Techniques and Tools
Topic: Opinions re: 6.5" deep kiln models
Replies: 6
Views: 367

Re: Opinions re: 6.5" deep kiln models

I've had no trouble using a 6" deep kiln for regular pieces (up to 1/2" thick). To be on the safe side, you can fire a little slower than you would in a larger kiln.

And the best option is a kiln that has the ability to turn off either the top or side elements.
by Brad Walker
Mon Mar 07, 2022 12:27 pm
Forum: Techniques and Tools
Topic: Slumping a double curve mould
Replies: 1
Views: 231

Re: Slumping a double curve mould

Bullseye has recommended schedules on their website for all of their molds: http://www.bullseyeglass.com/methods-id ... dules.html

For non-Bullseye molds, just find a similar shape on their recommended list.
by Brad Walker
Fri Feb 11, 2022 11:13 am
Forum: Techniques and Tools
Topic: Crystal Master Pro 12 Problem
Replies: 10
Views: 1104

Re: Crystal Master Pro 12 Problem

by Brad Walker
Sun Feb 06, 2022 5:54 pm
Forum: Techniques and Tools
Topic: Bubble trouble
Replies: 6
Views: 716

Re: Bubble trouble

1350F or higher should work.
by Brad Walker
Sun Feb 06, 2022 9:46 am
Forum: Techniques and Tools
Topic: Bubble trouble
Replies: 6
Views: 716

Re: Bubble trouble

Jon Markovic wrote:The stringers were 1mm diameter and set at 10mm centres.

I will try again with stringers set more closely together.


My rule of thumb is that with 1mm stringers you need to be around 3mm apart. Any further and the bubble will start to split.
by Brad Walker
Sun Feb 06, 2022 8:35 am
Forum: Techniques and Tools
Topic: Bubble trouble
Replies: 6
Views: 716

Re: Bubble trouble

Can't see a photo, but my guess is that you put the stringers too far apart. A bubble will split into multiple bubbles if that's the case. For larger bubbles you need more height between the two layers. For example, 2mm stringers can create larger bubbles than 1mm, and 3mm glass larger bubbles still.
by Brad Walker
Wed Feb 02, 2022 10:16 pm
Forum: Techniques and Tools
Topic: AIM thermocoupler insulation chipped.
Replies: 3
Views: 523

Re: AIM thermocoupler insulation chipped.

Contact AIM and ask them: https://aimkiln.com/contact/
by Brad Walker
Mon Jan 17, 2022 6:58 pm
Forum: Techniques and Tools
Topic: Sandblast grit
Replies: 5
Views: 837

Re: Sandblast grit

were there not debates here in the distant past where you could get better results when firing glass by using Aluminum oxide grit and NOT carbide. Yes, several debates. Mostly they centered on a belief that sandblasting with silicon carbide is more likely to devitrify upon firing. The only "pr...
by Brad Walker
Mon Jan 17, 2022 5:25 pm
Forum: Techniques and Tools
Topic: Sandblast grit
Replies: 5
Views: 837

Re: Sandblast grit

by Brad Walker
Sun Jan 16, 2022 6:02 pm
Forum: Techniques and Tools
Topic: sandblasting dissipate?
Replies: 6
Views: 1197

Re: sandblasting dissipate?

You'll get a matte finish. Exactly how matte depends on the grit used during the sandblasting, the temperature, and the hold time.
by Brad Walker
Tue Dec 21, 2021 9:20 am
Forum: Techniques and Tools
Topic: Fusing glass to a ceramic tile
Replies: 1
Views: 1237

Re: Fusing glass to a ceramic tile

Glass and ceramic have different coefficients of expansion, so will crack if fused together. The cracking could be anything from crazing, with small cracks everywhere, to so severe that the two will break apart after firing.

Experiment if you wish, but don't do it with anything valuable.
by Brad Walker
Sun Dec 12, 2021 10:26 pm
Forum: Techniques and Tools
Topic: Is is possible for glass to get too hot?
Replies: 4
Views: 1532

Re: Is is possible for glass to get too hot?

I'm guessing that my kiln shelf paper wasn't designed to deal with temperatures like that and sort of disintegrated. If you used thinfire paper, it's only good up to about 1525F. If you used fiber paper, each paper has a rating for its maximum temperature. Firing in a crucible would have probably w...
by Brad Walker
Sun Dec 12, 2021 1:07 pm
Forum: Techniques and Tools
Topic: Is is possible for glass to get too hot?
Replies: 4
Views: 1532

Re: Is is possible for glass to get too hot?

The glass will get more and more runny the higher the temperature. By 2000F it will be more like a liquid than a solid and you will most likely need some sort of container (crucible) or barrier (dam) to keep it from running off the shelf. The ash will melt and mix with the glass at temperatures abov...
by Brad Walker
Fri Dec 03, 2021 8:37 am
Forum: Techniques and Tools
Topic: schedule issue-did I screw up?
Replies: 2
Views: 1305

Re: schedule issue-did I screw up?

No problem.

I routinely turn the kiln off at 750 and let it cool on its own to room temperature with pieces as thick as 1/2", even 3/4". Your kiln would have to cool at several hundred degrees an hour for it to be a problem, and no kiln cools that fast on its own.

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