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Min

Member Since 31 Mar 2010
Offline Last Active Yesterday, 02:54 PM
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Posts I've Made

In Topic: Does This Make Sense? (Purchasing Equipment On Credit)

Yesterday, 01:55 PM

+1 for what has already been said for the advantages of having a pug mill by Mea and Mark. 

 

I wish I’ld bought mine at the beginning of my career. Got mine around the time I had a complete tear of my bicep (long head) on my right side. I’ve also have had several sentinel lymph nodes removed from right side for other reasons. Supposed to reduce “trauma” on that side now to help prevent lymphedema in right arm. The clay I use is fairly expensive so I do reclaim everything and have also mixed clay from scratch with it. That wasn't worth the dust and time but I learned from it.

 

 

Buy a pug mill or not, this is isn't a one size fits all decision. 


In Topic: Specific Gravity-Glaze Thickness Tools

Yesterday, 04:02 AM

 

I find a scale that measures in tenths of grams very useful for glaze testing. Less than a gram of chrome for chrome/tin red tests, often less than a gram for copper, cobalt, stains, and other colourants when the base for the test glaze is 100 grams. Agree with Mark when you are doing up a large batch of glaze you don't need to go with less than a gram.

Min how small are these tests-less than 500 grams total?

I have used my old triple beam for those smaller tests.

 

 

Yup, usually 100 or 200 grams for first test glaze then work up from there. For chrome/tin reds as an example since the chrome is usually only 0.15 I go to the hundredths. Even at 500 grams for the base the chrome would only be 0.75 so go to the hundredths even for that amount. My fake celadon uses 3 stains, all in tiny amounts like this. Yeah, I use an old triple beam for small amounts too. (makes me appreciate the digital scale even more) 


In Topic: Specific Gravity-Glaze Thickness Tools

20 May 2017 - 10:04 PM

I find a scale that measures in tenths of grams very useful for glaze testing. Less than a gram of chrome for chrome/tin red tests, often less than a gram for copper, cobalt, stains, and other colourants when the base for the test glaze is 100 grams. Agree with Mark when you are doing up a large batch of glaze you don't need to go with less than a gram.


In Topic: Lesson #541

19 May 2017 - 07:00 PM

Lesson #637

 - Don't make the outside of the pot smaller than the inside of the pot when trimming.

Lesson #638

 - Use the tools you have to help determine the thickness of the walls and bottoms of the pots.

 

For lesson #638, this little thing is super simple and it works. Stick a pin into a dowel or whatever then snip it to the depth you want the bottom of the pot or snip off one you already have. Attached File  pin.jpg   17.93KB   0 downloadsFaster than using a regular pin-tool and more accurate for getting an even depth across a wide base. 

 

edit: sorry should have added this would be used when throwing not trimming.


In Topic: Will Lowering Specific Gravity Always Make A Glaze Less Likely To Run?

19 May 2017 - 06:48 PM

With 40% kaolin in that first recipe there's no way you should need to add bentonite to it. Really wouldn't add more epsom salts solution to it, just going to make it thicken up even more. I'ld pull out about a cup of glaze, then add some darvan to it, just a drop or two at a time, give it a good stir then dip a test tile. Add more darvan a little bit at a time until the glaze is at a good consistency. I'm guessing it's going to take longer to dry so drips are probably going to be a problem. Have to fettle them down when the glaze is really dry. Use the small test glaze as a guide to fix the rest of it.

 

Second glaze, I can see 2% bentonite in this one, not the 4. Again, I would try a small amount of glaze with a titch of darvan and see how the glaze hangs on a test tile. Go by the specific gravity, not how it looks. Think of thickening a sauce when you are cooking, you add a cornstarch slurry to thicken a sauce, water content doesn't change but the sauce is thicker. The bentonite and epsom salts did that, you don't want a watery sauce / glaze, you "thin" it down with darvan.