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

[Vlasova Tatiana]

The bottom of the cone is rounded, but I will check it again.
And I understanded about attaching to wheel Thank you!

2018-05-20 15:21 GMT+03:00 <wschran at twc.com>:

> Using slip instead of water would not cause the problem you describe.
> From what you wrote it appears you are creating a void at the center of
> the bottom of cone of clay.
> Is the bottom of the cone flat or rounded?
> If it is flat the void can happen when you attach to wheel.
> Try rolling the bottom of the cone into a rounded shape then attaching
> firmly to wheel.
> With wheel turning very slow, using no water or slip, slap the cone all
> around bringing the edge down to wheel head and seal the edge with your
> finger.
>
> Bill
>
> William Schran
> wschran at twc.com
> 703-505-1617
>
> ---- Vlasova Tatiana <yanatt at gmail.com> wrote:
> > 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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