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potterbeth

Member Since 13 Feb 2013
Offline Last Active Sep 19 2014 03:06 PM
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Posts I've Made

In Topic: I Want Porcelain!

15 September 2014 - 08:56 AM

Many years ago, I was the only student working porcelain in a brown clay university studio. When I asked the professor about doing this, she agreed that my skill level made the choice acceptable. However, we agreed that the onus was on me to create and maintain a clean porcelain work area for table work and wedging. Together, we worked something out, but it was still difficult to avoid contamination of the porcelain with the brown clay. Throwing porcelain is akin to working with butter or cream cheese compared to most other clays. Chris is right in saying that you need to have a thorough discussion with your instructor as a first step. Enjoy!


In Topic: Tips & Tricks

10 September 2014 - 07:43 AM

I'm using an OXO brand shower squeegee to smooth large slabs after rolling them with canvas. The suction holder attached right to the metal end of the slab roller so it's always there.


In Topic: Kiln Lid Gap Help?

10 September 2014 - 07:38 AM

Have you contacted L&L...this does not sound normal.


In Topic: Real-Time Kiln Advice (Kiln Curently Firing)

30 May 2014 - 11:31 AM

Regarding the stall in temperature rise: Are you sure the burners are properly sized for your kiln?

 

In my first painful experience with venturi burners, the burners were too small for the 40 cubic ft kiln. We were able to get to temperature after long grueling struggles by people with significant gas firing experience. Some firings took almost twice as long as they should have. Results were interesting. We spent most of a semester doing this before the size issue was identified. Smaller burners were replaced with larger ones, and VOILA the problem was solved.

 

Now, that kiln was being fired with industrial pressure piped natural gas. But, for years before, the same kiln was successfully fired with two tall bottles of liquid propane and forced air burners in all types of weather conditions including freezing during the winter.

 

Just a thought.


In Topic: Wheel Issues

10 April 2014 - 07:59 AM

If the bat is not completely flat on the wheel head, that may be the problem. Once the bat is on the pins, use your fists to pound the top of the bat directly over the bat pins. Then, spinning the wheel at medium speed, hold your finger at 6 o'clock on the top edge of the bat as it revolves. If your finger moves up and down, the bat is not level. Some people can compensate for this, but it makes many struggle. I've had some bats fit so tightly on the pins it made them difficult to put on AND remove. Most bats eventually wear enough to solve the problem, but on one wheel we had to replace the bat pins to solve the problem, so maybe we had a slightly large pin?

 

Also, is your wheel on a level surface? That can also be problematic. Use a level to check the wheel head AND the wheel table. If they are not on the same level, your shaft or wheelhead may be damaged.

 

The suggestions to try throwing without a bat are an excellent way to diagnose. Sorry you're finding frustration when you should be happily spinning clay!