[Clayart] Hole in the bottom of a bowl on a potter's wheel

[Vlasova Tatiana]

Thank you, very much, Sumi
I understanded, i was will try control it.
I m not compressing the bottom . Will be try do it
Thank you!


2018-05-20 6:21 GMT+03:00 sumi <sumi at herwheel.com>:

> Sometimes if you are centering large amounts of clay and putting a lot of
> pressure on the clay, air can get drawn under the cone of clay and create
> the kind of bubble you describe. This is particularly likely if your clay
> is a little bit stiff and you have to push hard on it.
>
> When Cyndy asks if you are compressing the bottom she means after opening
> up the clay and creating the floor of the pot you should push down across
> the bottom of the pot a couple of times to make sure the clay particles are
> tightly pressed together. If you do this you might feel an air bubble
> underneath also.
>
> Sumi
>
>> Thank you, William
>> Usually I throw clay on a wheel in the cone with a round bottom, and I
>> press (lower) it from above, but not along the edges below.
>> I'll see to it that I press it down near the wheel.
>> Thank you!
>>
>> I centering pieces more than 3kg so slowly and long time, and instead of
>> water I use a slip for wetting. Can a slip or a long centering create a
>> problem with a bubble in the bottom?
>>
>> 2018-05-19 13:06 GMT+03:00 <wschran at twc.com>:
>>
>> This may have been from when the clay was attached to the wheel head or
>>> bat.
>>> The shape of the bottom of the clay may have had a small depression or
>>> void from wedging.
>>> Have the bottom of the clay that will be attached to wheel head curved to
>>> avoid this.
>>>
>>> bill
>>>
>>> William Schran
>>> wschran at twc.com
>>> 703-505-1617
>>>
>>> ---- Vlasova Tatiana <yanatt at gmail.com> wrote:
>>>
>>>> Hello! Can I ask for advice for novice potter?
>>>>
>>> I make a bowl 28-30 cm, and when I remove it from the wheel, there are no
>>> air bubbles, there is no hole at the bottom. But when the bowl dries, the
>>> hole forms from the outside downwards in the center. Where the bottom
>>> touched the wheel. Not cross-cutting
>>> As if the clay in this place was more wet and sat down more.
>>> When I cut the bottom, I removed this hole. But I do not understand why
>>> this is happening?
>>>
>>> many thanks
>>> Tanya
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