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Many people don't realize that the air temperature in the kiln isn't necessarily the same as the glass temperature. The glass temperature is affected by conduction to the mold, convection with the air and radiative coupling to the elements. You're not going to change the air or the mold, so the only...

The rule of thumb is twice the diameter of the hole from the edge of the hole to the edge of the glass or a minimum of twice the thickness of the glass. I also found a reference to 6 diameters from the corner of the glass. I think your dimensions are very conservative and should work fine. Support y...

Some of the thread talks about hot casting. Then Bert talks about his experience kilncasting: "Many years later, I was taught how to kilncast with sand. That lesson used 20% dry plaster mixed with the sand. I have switched to 25% alumina hydrate, because it lasts longer for me. I reuse my sand ...

This thread from the archives should be helpful.
http://www.warmglass.com/phpBB3/viewtop ... ld#p346214

Tony

Jim, Its 0.707 x diameter So if you have a 10" diameter, 10" is the hypotenuse or long side of the square Pythagorean theorem says the square of the hypotenuse of a right triangle equals the sum of the squares of the other sides so, a^2 + b^2 = c^2 c=10, so 10 ^2 = 100 Since a square has e...

The first thing I would do with just a mold or shelf in the kiln, is to measure the max temperature with just the top elements and then just the side elements. Those will be the limiting cases for your testing going forward. I expect you won't get to slumping temperature with just the lid element, s...

It's interesting that Olympic is using a single zone of a three-zone controller and wiring all three relays in parallel. I suppose it would allow them to use a single-zone controller without having to change the wiring. To answer your questions, one element has a higher resistance because it is long...

Not exactly... by cycling more frequently, the gas-powered compressor will keep up with the demand, which is your main concern. This doesn't impact compressor life as much as you might think... going from empty to full pressure is way more stressful on a compressor than varying the pressure from 90 ...

For their size, gas powered compressors have way more flow than electric, but because they're portable, they have smaller tanks resulting in less reserve capacity. That said, SCFM at pressure is the indicator that you need to evaluate. Depending on your sandblasting setup, you may see some pressure ...

It depends if both side relays are wired together as a single zone or if they operate independently. Either way, a DPST toggle switch will do the job. Break one control line on one side of the switch and break the other on the other side of the switch.

Tony

The RTC-1000 technical manual is on the Bartlett website. http://www.bartinst.com/kilns/2 On page 5 of the manual is an illustration showing the outputs from the board to the relays. This controller will run three zones. I expect your kiln only has two zones - top and side. To turn off the side elem...

It's easy to add two switches, one to control the top (on or off) and another to control side (on or off). It's more of a challenge to combine the two because you need three positions: top; side; and both. You could order a double pole, triple throw switch, they're just not readily available at your...

It's written in scientific notation. In our world, just read it as 115 +/- 3 or 112 - 118 if you like. It's a much more precise way of writing 115.

Tony

jim simmons wrote:Tony.
By "contamination" I assume that you mean the tin left by the float process.
The other Jim

Yup. That's what I meant, and why most people ask which side is up.

Tony

Jim is right, but keep in mind that art glass isn't like float glass which has one side "contaminated" by the float process.

Tony

I'm pretty sure applying micas to the surface of glass was also patented.

Tony

If you bothered to read Jim's reply before being rude to him, you would have understood that he WAS talking about the Rosco product you asked about. Yes, the Rosco film will work. You can use a piece on the light source and another to look through. Jim's suggestion was to use the Rosco film on a lig...

Peter,

Check out Sculpt Nouveau. http://www.sculptnouveau.com

They have a YouTube page as well.

They have patinas and base finishes for all materials that replicate many different oxides.

Tony

Seachange, You are correct. The entire sheet would be taped and transferred prior to weeding. The second question gets back to the tack discussion. Larger pieces are much easier to weed off the backing sheet than off glass since the adhesive does stick quite well to glass. Paint mask is a great way ...

Seachange, I agree that photoresist is child's play. But it has some detractors that you're already aware of. I haven't found any benefit to using clear transfer tape. I have 6", 12" and 24" rolls of plain old transfer tape (picture light weight masking tape) on the racks and use whic...