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by Lauri Levanto
Sat Jan 12, 2013 5:52 pm
Forum: Techniques and Tools
Topic: plaster
Replies: 13
Views: 6613

Re: plaster

I have used several alternatives.. Liquid soap is a good one. If the piece is dry enough, any oil works well. On a wet surface oil may separate and leave gaps. Even a slurry of clay may work, if you manage to open when it is still wet. It is the most difficult, as it deters air flowing into the seam...
by Lauri Levanto
Wed Jan 02, 2013 3:01 pm
Forum: Newcomer Forum
Topic: Matte slumped pieces
Replies: 27
Views: 14802

Re: Matte slumped pieces

If you happen to have old fashioned iron fillings in your teeth, you can test the tin side by licking. If you lick the tin side, you felel slight electricity. With air side not.
Remember to reclean the glass after that.
by Lauri Levanto
Tue Dec 11, 2012 3:20 pm
Forum: Techniques and Tools
Topic: Shock from kiln
Replies: 16
Views: 8524

Re: Shock from kiln

My preferred way to wire a kiln is with a high temp limit circuit, that includes a hitemp limit controller, a thermocouple, and double pole mechanical relays for each zone. The controller is wired with a light switch. When you take power away from the controller, the mechanical relays open, which r...
by Lauri Levanto
Tue Dec 11, 2012 12:31 am
Forum: Techniques and Tools
Topic: Shock from kiln
Replies: 16
Views: 8524

Re: Shock from kiln

here we have live, zero and ground. The kiln exterior must be connected to the ground. My own kiln has three phase wiring (Three live plus ground). There is also an extra relay in line that before the working relays. The purpose is to cut off all live lines when the kiln is opened. It is triggered b...
by Lauri Levanto
Thu Nov 15, 2012 1:54 pm
Forum: Techniques and Tools
Topic: Bohle Silberschnitt running pliers
Replies: 16
Views: 15197

Re: Bohle Silberschnitt running pliers

Most running pliers have curved jaws. They are good.
Bohle has a flat upper jaw and a tiny nibble in the middle of the bottom jaw.
I made a little groove n the upper jaw surface that matches the nibble.
That works.
-lauri
by Lauri Levanto
Thu Nov 15, 2012 1:48 pm
Forum: Newcomer Forum
Topic: Kiln Heat in Room
Replies: 8
Views: 7422

Re: Kiln Heat in Room

All the energy, in my case 8-12 kWh, turns to heat which at some point leaves thekiln and warms the room. It helps a little in the cold Scandinavian winter, but not enough. Opening a hot kiln. Sure it delivers a hot blow enough to burn your eyelashes. That is the short term effect. Be really careful...
by Lauri Levanto
Thu Nov 01, 2012 4:27 am
Forum: Techniques and Tools
Topic: Opaque paint markers
Replies: 3
Views: 2430

Re: Opaque paint markers

I have used Pilot silver marker in full fuse. It tends to turn black or dark grey.
-lauri
by Lauri Levanto
Thu Nov 01, 2012 4:25 am
Forum: Techniques and Tools
Topic: Running pliers for thick glass
Replies: 18
Views: 10731

Re: Running pliers for thick glass

The picture brings in mind a question that has bogged me for a while.
Why the handles of asymmetric pliers (running and gozing) are made similar.
A different feel would lead to use them the right side up.
by Lauri Levanto
Sat Oct 27, 2012 4:58 pm
Forum: Techniques and Tools
Topic: LIQUID GLASS................CMC.............Alternatives
Replies: 31
Views: 19320

Re: LIQUID GLASS................CMC.............Alternatives

For quick demanding jobs I use 1. Model airplane glue (cellulose dissolved into acetone) or 2 nail polish (quite the same stuff, easier to apply but more expensive). For slow drying thick CMC goo applied with a ketchup squeeze bottle Medium working time 3M contact glue spray. The latest experiments ...
by Lauri Levanto
Wed Oct 24, 2012 2:15 pm
Forum: Newcomer Forum
Topic: irredescence
Replies: 3
Views: 3208

Re: irredescence

Hairspray iridescent sounds to me like vaporware.
Has anyone tested lustres that are used in porcellain painting?
-lauri
by Lauri Levanto
Fri Oct 12, 2012 1:52 pm
Forum: Newcomer Forum
Topic: Adding glass during a slump ?
Replies: 20
Views: 11969

Re: Adding glass during a slump ?

You may have tools for measuring thermal expansion. The point here is avoiding permanent stress. It can be seen with a pair of polarized filters. Search this forum about polarization. I strongly recommend that you make a small test. It can be a 4"square you process according your plans. See if ...
by Lauri Levanto
Thu Oct 11, 2012 4:56 pm
Forum: Newcomer Forum
Topic: Adding glass during a slump ?
Replies: 20
Views: 11969

Re: Adding glass during a slump ?

I don't know about faster given that some of the schedules I have seen for doing telescope mirrors take DAYS to run, which I can understand on larger mirrors where I might be casting as much as 20-40 lbs of glass, and in some cases MORE !!! It is not the weight that counts but the distance the heat...
by Lauri Levanto
Thu Oct 11, 2012 1:20 pm
Forum: Newcomer Forum
Topic: Adding glass during a slump ?
Replies: 20
Views: 11969

Re: Adding glass during a slump ?

I think ( with no further experience) that two phase firing is the fastest way to go. First slump the front plate. 1/2" does not take too long to anneal and cool. Then add the foam glass mixture for a second firing. That may be a little tricky. You have a thin biscue dome under the sheet. It ta...
by Lauri Levanto
Wed Sep 05, 2012 3:28 am
Forum: Newcomer Forum
Topic: New and kiln is getting delivered today!
Replies: 9
Views: 8706

Re: New and kiln is getting delivered today!

There is one little thing you urgently need. The kiln diary. You need a drawing or photo of the pieces you put in the kiln. You need a list what glass colors you used. You note down the firing program When you open the fired kiln, you spend some time to admire your results. Note down what was good, ...
by Lauri Levanto
Mon Aug 20, 2012 6:12 am
Forum: Techniques and Tools
Topic: best glass bandsaw
Replies: 5
Views: 4811

Re: best glass bandsaw

I do not know how well it handles thick glass but the German Proxxon brand http://www.proxxon.com/eng/html/27172.php looks well built and has diamond band plus water feed. For precice cutting of thin glass it is excellent. very narrow kerf permits cutting both sides if a figure line in one run. Unfo...
by Lauri Levanto
Fri Aug 10, 2012 10:25 am
Forum: Techniques and Tools
Topic: 'OTHER' MEANS OF POLISHING GLASS
Replies: 12
Views: 7017

Re: 'OTHER' MEANS OF POLISHING GLASS

No-one has yet asked the question of professional pride and honesty. My spectacles have plastic lenses, but I can't imagine me making plastic glass art. Even partly. In some works I use glue for sure. Then I make it look like glued. To put a laquer on a matte surface? Not for me. If I can't polish I...
by Lauri Levanto
Sat Aug 04, 2012 2:57 am
Forum: Techniques and Tools
Topic: Drill bit opinions?
Replies: 17
Views: 8167

Re: Drill bit opinions?

I have to invest as little as possible to tools, because I prefer to buy glass. For a half inch hole I have to use what I have. First a 2-3 mm hole with Dremel Then I enlarge it with the 6 mm extension bit on an edge grinder Glasstar.type. When I get the bit throuh, I use it as a grinder, moving aro...
by Lauri Levanto
Wed Aug 01, 2012 10:54 am
Forum: Techniques and Tools
Topic: Fire n flip adhesive
Replies: 5
Views: 2577

Re: Fire n flip adhesive

Similar works I have done using 3M contact glue spray. The volume of combusting material is so small that emiited smoke or gassing is mot noticeabe in 1sqft piece.

The spray glue gives the glass some 'tooth' that makes frit painting easier.

-lauri
by Lauri Levanto
Mon Jul 16, 2012 5:07 pm
Forum: Techniques and Tools
Topic: Why do kiln shelves break?
Replies: 17
Views: 9865

Re: Why do kiln shelves break?

I secomd MOrganica's report.
Especially plaster molds warm up very very slowly.
As long as there is a tad of moisture in the plaster it does not get over boiling point. Even after that the water in the chrystalline lattice resist heating.

-lauri
by Lauri Levanto
Wed Jul 11, 2012 3:55 pm
Forum: Newcomer Forum
Topic: Plate broke during slumping
Replies: 9
Views: 6446

Re: Plate broke during slumping

Good photo ! The parts have moved far apart. I understand it so that the blank exploded quite early, before it started to slump. It was the explosion tha moved the pieces over the mold rim. Why did it do that? Maybe too fast ramp up or the leaf pattern has absorbed heat faster than the clear part, t...

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Suite 700
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Phone: (336) 712 8003
Email: wg@warmglass.com