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by Bert Weiss
Tue Dec 22, 2015 1:42 pm
Forum: Techniques and Tools
Topic: What's latest word on kiln use & pacemakers?
Replies: 6
Views: 3902

Re: What's latest word on kiln use & pacemakers?

Carol, I would call Digitry and ask. They are engineers and should have a clue.
by Bert Weiss
Mon Dec 21, 2015 10:59 pm
Forum: Techniques and Tools
Topic: relays for kilns
Replies: 28
Views: 28986

Re: relays for kilns

Mark, I have only ever worked with single pole single throw relays like in Brad's drawings. One side of 240v single phase power is connected directly to one side of the element and the other side goes through the relay. When the relay is open, the elements do not get hot. However if you touch an ele...
by Bert Weiss
Mon Dec 21, 2015 6:48 pm
Forum: Techniques and Tools
Topic: Thermal shock problem, first time in 12 years, pics
Replies: 12
Views: 8089

Re: Thermal shock problem, first time in 12 years, pics

My opinion is that 950 is too hot for the soak, Bullseye suggests 900. Hey Bert - if she's using System 96 - why shouldn't she soak at 950, as recommended by Spectrum? Barb I wonder why Spectrum suggests this in the first place? Back in the 1980's I tested both Bullseye and 96 for anneal point char...
by Bert Weiss
Sun Dec 20, 2015 2:58 pm
Forum: Newcomer Forum
Topic: Vermiculite board
Replies: 3
Views: 4758

Re: Vermiculite board

Chris Lowry wrote:So I carved out a vermiculite board to make a slumping mold... Do I need to put kiln wash on it before slumping?

I think no but the wife doesn't agree with me and now I'm doubting myself.
Yes! a generous coating. V board has a wicked tendency to stick to glass when both are hot.
by Bert Weiss
Sun Dec 20, 2015 1:18 am
Forum: Techniques and Tools
Topic: Thermal shock problem, first time in 12 years, pics
Replies: 12
Views: 8089

Re: Thermal shock problem, first time in 12 years, pics

Hi Bert, Thank you very much for your comments. You are right, any time the kiln is running unnecessarily it's a huge waste on multiple levels. Annealing at a lower temp makes a lot of sense given the mass of thicker glass. I will study more about this. I've seen you guys recommend the Graham Stone...
by Bert Weiss
Sat Dec 19, 2015 12:27 am
Forum: Techniques and Tools
Topic: Thermal shock problem, first time in 12 years, pics
Replies: 12
Views: 8089

Re: Thermal shock problem, first time in 12 years, pics

My opinion is that 950 is too hot for the soak, Bullseye suggests 900. If I am correct, you wasted 3 hours soaking above the anneal range and then the anneal actually took place during the drop to 850, which was speedy. The soaks on the way up were a monumental waste of time and energy. I would just...
by Bert Weiss
Fri Dec 18, 2015 11:29 am
Forum: Techniques and Tools
Topic: relays for kilns
Replies: 28
Views: 28986

Re: relays for kilns

Thanks Brad. That is a useful drawing. I am wracking my brain to remember, but I think I had to put some device between the hitemp alarm output and the contactor. The output from the controller had to be somehow transformed so it could control the contactor. I used to put a fast acting fuse between ...
by Bert Weiss
Thu Dec 17, 2015 11:29 pm
Forum: Techniques and Tools
Topic: relays for kilns
Replies: 28
Views: 28986

Re: relays for kilns

I agree with Brad here, but I do it only slightly differently. I use a mechanical DPDT contactor attached to a hitemp limit circuit with a light switch, and a SPST SSR controlling the kiln. This setup allows you to remove all power to the elements when you want safety, and control the elements the m...
by Bert Weiss
Wed Dec 16, 2015 4:07 pm
Forum: Techniques and Tools
Topic: relays for kilns
Replies: 28
Views: 28986

Re: relays for kilns

I saw somewhere that one of the major kiln manufacturers came up with a control box design (on the side of a hot kiln) where the aluminum heatsink sits on the outside of the box, while the relay itself is situated inside the box. They routinely ship these to Europe.
by Bert Weiss
Mon Dec 14, 2015 9:55 am
Forum: Techniques and Tools
Topic: relays for kilns
Replies: 28
Views: 28986

Re: relays for kilns

http://www.eurothermonline.com/Zelio_SSP1_Series-Single_Channel_SSR-Panel_Mount Like Brad posted you need the relay, a heatsink, and either a pad or liquid heat transfer goo. They just changed brands starting in January, so call and ask which model you need. With solid state relays you can configur...
by Bert Weiss
Fri Dec 11, 2015 1:04 pm
Forum: Techniques and Tools
Topic: Patching a fiber board shelf
Replies: 5
Views: 4459

Re: Patching a fiber board shelf

Yes, grind up some scrap board, mix with rigidizer and spackle the board. If you have already used colloidal silica rigidizer, go ahead and use that. The boards are originally made with colloidal alumina rigidizer. This is less sticky to the glass being fired.
by Bert Weiss
Mon Dec 07, 2015 5:22 pm
Forum: Techniques and Tools
Topic: Reversability of Boron Nitride on ceramic moulds.
Replies: 9
Views: 6489

Re: Reversability of Boron Nitride on ceramic moulds.

http://www.rustoleum.com/MSDS/ENGLISH/7515838.pdf I looked up the melting point of aluminum and it says 1221ºF. Interesting report that it works to 1350. I wonder if there are any paints where the solid ingredient is some colored mica. I bet that would work better. I suspect that aluminum refers to...
by Bert Weiss
Mon Dec 07, 2015 10:23 am
Forum: Techniques and Tools
Topic: Reversability of Boron Nitride on ceramic moulds.
Replies: 9
Views: 6489

Re: Reversability of Boron Nitride on ceramic moulds.

Rust-Oleum number 7515 --- Fumes/Health ???? http://www.rustoleum.com/MSDS/ENGLISH/7515838.pdf I looked up the melting point of aluminum and it says 1221ºF. Interesting report that it works to 1350. I wonder if there are any paints where the solid ingredient is some colored mica. I bet that would w...
by Bert Weiss
Thu Dec 03, 2015 7:53 pm
Forum: Techniques and Tools
Topic: Stainless Steel for molds?
Replies: 15
Views: 15971

Re: Stainless Steel for molds?

I use regular 304 stainless, which is the most common grade. I have used very thin and up to ⅛" thick. It just works. Remember that glass shrinks more than stainless. I have spherical shaped molds that will grab the glass if cooled all the way to room temp. When warm the glass will come out. If...
by Bert Weiss
Mon Nov 23, 2015 6:56 pm
Forum: Techniques and Tools
Topic: FLashed Stained Glass Breaking
Replies: 4
Views: 3684

Re: FLashed Stained Glass Breaking

Speed always kills glass. Must be slow learners too if they continue to have the problem. :lol: That of course is what you can get if you try sourcing knowledge from there instead of here. #-o You already know the answer, dark colours absorb heat faster, there is uneven heating of the piece due to ...
by Bert Weiss
Sat Nov 21, 2015 11:44 am
Forum: Techniques and Tools
Topic: architectural glass mounting ... rubber/epoxy?
Replies: 5
Views: 4065

Re: architectural glass mounting ... rubber/epoxy?

You can get silicone epoxy that comes in 2 parts. Some are clear and others not.

I am a fan of using L screws. They are minimally visible, and will not let the load fall off.
by Bert Weiss
Thu Nov 19, 2015 12:58 am
Forum: Techniques and Tools
Topic: cutting fused 6m
Replies: 5
Views: 4684

Re: cutting fused 6m

We anneal glass better than the factories that make it. At the factory, every second translates to dollars. For us, we want to fire up and down in a day. That said, if you have fused glasses that are not all that compatible, those stresses will come out to play when you cut. Most likely you can just...
by Bert Weiss
Wed Nov 11, 2015 3:11 pm
Forum: Kiln Casting
Topic: Slumping large pieces in Paragon Pearl 56
Replies: 3
Views: 4370

Re: Slumping large pieces in Paragon Pearl 56

Your glass is probably cracking due to thermal shock. Slow down.
by Bert Weiss
Thu Nov 05, 2015 12:19 pm
Forum: Techniques and Tools
Topic: relays for kilns
Replies: 28
Views: 28986

Re: relays for kilns

I have been running SCR solid state relays since the mid 80's. I have had 2 runaways. One was caused by controller failure, the other was an SCR stuck closed. Neither of these events was catastrophic for me. In my single zone kiln, it was the controller failure. Both of my kilns have nichrome elemen...
by Bert Weiss
Mon Nov 02, 2015 9:04 am
Forum: Kiln Casting
Topic: chip in edge of floral formed vase
Replies: 1
Views: 2865

Re: chip in edge of floral formed vase

I'll guess this was caused by the glass sticking to the mold. This could interfere with a good anneal.

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