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Everything posted by dhPotter
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glaze that settles rock-like quickly
dhPotter replied to grackle's topic in Clay and Glaze Chemistry
@Roberta12 This mixing matte and gloss works great!! I have a base of G2934 at 40% and a clear, G1216M, at 60%. This base has given me white, tan, yellow, turquoise and gray liner glazes. The glazes are very durable. -
Trouble with Coasters Warping
dhPotter replied to Rachel Hawkins's topic in Studio Operations and Making Work
I do this with a bisqued piece because it shrinks just enough to fit inside the cookie cutter but loose enough to not get stuck in the cookie cutter. The bisqued circle gives you coverage over the whole shape, so you are not pushing to release in just a few spots. -
Thermocouple Type S Price Insanity
dhPotter replied to Hyn Patty's topic in Equipment Use and Repair
@neilestrick Where can an open end tube be purchased? I looked on Olympic website and did not see any kind of tube and they only had type S thermocouple, $545 - $655. L&L has the open end tube for $57. Will this tube work on an Olympic 2327 HE? -
I bought into the GB not going to be around back in 2008. Have been using Boraq, 1 for 1, as my Gerstley Borate substitute. It was around $70 per 50 lb bag about 5-6 years ago.
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@Caroline Ennis My schedule has a ramp from 500*F to 2050*F at 400*F/hr. Then ramp at 108*F to 2185*F. A hold of 15 minutes at this temp. Then free fall drop to 2085*F and hold for 30 minutes. This has stopped the blistering(pinholing). Your blistering(pinholing) having sharp edges means the blister occurred after you hit top temp and the kiln was cooling and there wasn't enough heatwork to heal over the blister.
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Teach class with only one wheel?
dhPotter replied to shawnhar's topic in Educational Approaches and Resources
That is how I do it. I demonstrate then let them drive the wheel. I sit next to them coaching for the first 2-3 times they do it. If they need more demonstrating then we switch seats. Then its back to coaching them from the sidelines. Works out well so far. Been doing it this way for 3 years. -
Cone 6 Body W/ Low Warping & Water Absorption
dhPotter replied to mrcasey's topic in Studio Operations and Making Work
How do you flip the slabs while they are drying on the drywall? Do you pick them up with your hands, or use another board of drywall on top to flip them - like a sandwich of drywall with slab in the middle? -
How to make this glaze a bit less glossy?
dhPotter replied to Bam2015's topic in Clay and Glaze Chemistry
Of the 2, Custer and Minspar, Custer is a better replacement for the G-200. Custer is closer to the same chemistry as G-200. -
Oxide washes on top of glazes! Oh my!
dhPotter replied to Rick Wise's topic in Aesthetic Approaches and Philosophy
Special or custom orders tend to come back and bite you. Very much agree with this statement. I now understand why y'all have said over and over to never take custom orders. It is a never-ending saga. -
Element Life and Kiln Best Practices
dhPotter replied to Crooked Lawyer Potter's topic in Equipment Use and Repair
This may have been on this forum. It is very helpful. When to Open the Kiln 1. When the kiln temperature falls to 600°F, open all the peep holes. 2. When the temperature reaches 450°F prop the lid 1 inch. 3. When the temperature reaches 350°F, the lid/door can be opened 3 or 4 inches. 4. When the temperature reaches 250°F you may completely open the kiln allowing it to finish cooling prior to unloading. 5. When the temperature hovers around 200°F the kiln can be unloaded. -
If you are using glaze calc software you will need to raise the silica and lower the alumina. Pay attention to the Si:Al ratio with the Si being much more than the Al. Others here can tell you what ingredients will raise or lower the 2 items. Think about replacing some ingredients, such as replace Calcium Carb with Wollastonite. I am not chemically competent to tell you much about other ways to raise and lower the ratio.
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The customer wanted a very plain plate. Customer also wanted a tan with little to no rust breaking. It took well over 100 test tiles to develop. Then numerous plate firings to get the glaze application thickness just right. This glaze was developed by mixing a clear at 60% and a matte at 40%. The color was developed by adding 2% rutile, 2% tin oxide and 1.6% RIO. The glaze has some visual movement. This glaze is food safe with no cutlery marking. Cutlery dragged across the glaze has little to no sound. The glaze does not physically move when fired - stays where you put it.
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The evolution from dipping to spraying. All of these pieces have new glazes. Learning new glazes and how they act and learning to spray glaze.
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From the album: Evolution
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From the album: Evolution
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From the album: Evolution
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From the album: Evolution
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From the album: Evolution
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Beginning wheel throwing projects
dhPotter replied to Pres's topic in Studio Operations and Making Work
@nancylee For amounts of clay you are talking about, I pat the clay, as the wheel slowly turns, into a semi-centered mound. Then I place both hands on the opposite side of the mound and as I increase the speed of he wheel, pull the mound towards my body. This gets the mound closer to centered, but I don't worry about perfect at this time. Now I cone the clay 3 times, after each cone try to place your hands in your centering position and hold till the mound gets closer to centered. By the 3rd cone everything should be aligned and centered. I had read where Marcia Selsor likes to have the chair she sits in be positioned so when she looks down at the wheel she is looking about 1 inch beyond the center of the wheel. This has helped greatly. Try to lay your weight on the mound with your shoulders well over the mound. I usually end up with clay on my chest from hugging the mound. -
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dhPotter commented on liambesaw's gallery image in Browse Member Galleries
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dhPotter commented on liambesaw's gallery image in Browse Member Galleries