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

[Vlasova Tatiana]

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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