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earthfan

Member Since 11 Mar 2013
Offline Last Active Today, 12:02 AM
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Posts I've Made

In Topic: Rotary Glaze Sieve

25 March 2015 - 04:15 AM

I belong to a potters' club that purchased the Talisman sieve, but we all discarded the brush as being too much of a nuisance to clean. We advise our new members to just buy the sieve and use an ordinary brush to get the glaze through it. I use a pastry brush from a supermarket. It has no visible metal parts.


In Topic: No More Wheel

21 March 2015 - 12:40 AM

Sorry to hear about your arthritis. I belong to a club where the long-time members are in their seventies and are doing more hand work. I am doing hand work too, because I am bored with everything coming out round. Our club has a slab roller which I don't use, preferring my really good, long rolling pin, but the other members use the roller. I also have a good potters' harp with the slots close together and I can cut slabs of a suitable thickness. My friends also use plaster moulds for basic things like bowls, which they then decorate with applied texture.

Carving is easier on slab or coil work, I find. Throwing rings have different densities of clay which make the carving tool deviate from where I am aiming.


In Topic: Stamping Pottery

17 March 2015 - 09:13 PM

Vegetable dye sold for cakes is the perfect stuff for marking clay. Use a fine liner brush held horizontally while the pot is still on the wheel. I also have a bat marked with circles and different divisions radiating from the same centre point as the circles. This allows the piece to be divided into even sections. Especially if the divisions are marked on the bat on which you are throwing.


In Topic: What Is The Most Interesting Glaze Ingredient To You?

09 February 2015 - 05:08 AM

Re: spodumene concentrate from Greenbushes mine in Western Australia. I fired a bowl half full of the spodumene sand to about cone 7. This is a guesstimate, because although Cone 9 was down, the bottom shelf was seriously underfired. The spodumene in the bowl puffed up to twice its volume and developed deep cracks in its surface. The pile which had been sand was now flour, no grinding required.

I have read in a couple of books that lithium glass does not have a negative co-efficient of thermal expansion. Only the crystalline forms do. But the same books say that up to about .09 of mole, lithium oxide does help cure crazing. More has the opposite effect.


In Topic: What Do You Cover Your Work Tables With?

04 September 2014 - 06:54 AM

In Australia we have a sheet building material that is made of cellulose held together by cement. We call it fibre cement and it replaces asbestos cement that is no longer made. It makes terrific bats and it's the perfect surface for work tables. It is cheap, porous, smooth and doesn't' warp, chip or rot. I have an old pine table that I have covered with builders' plastic with a whole sheet of fibre cement on top. To protect the plastic sheeting I have put some offcuts of my kitchen floor covering between the two layers. You can wet down the fibre cement when you want to get into hand building. When it is dry, it really sucks the water out of sloppy clay, so I use it to stiffen clay that is softer than I like.