Johnnie J. on wed 2 nov 05
Recently I have been throwing lids on domed plaster bats. In the past (many years ago) I had great success doing so. Now it seems that often the underside of the lids crack soon after the lid has released from the bat. I wax resist the knob as soon as appropriate to retard thr knob drying faster than the lid. [I do thid to all attachments like knobs, handles, spouts, etc.]
I'm using ^6 clay; sometimes recycled and sometimes new. Seems there's a greater loss ratio from recycled clay.
Anyone have an explanation and insturctions how to avoid this in the future?
Thanks for your help!
Johnnie J. (John Johnson)
Mud Bucket Pottery
mudbucketpottery.com
843-399-8702
Johnnie J. (John Johnson)
Mud Bucket Pottery
mudbucketpottery@yahoo.com
www.mudbucketpottery.com
(843)399-8702
(843)340-1674 cell (when it works)
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www.agpstudio.co.uk on wed 2 nov 05
Hi Johnnie,
I think the reason is: the plaster has absorbed the water from the =
underside of your lid and it is trying to shrink - and cannot compared =
to the top of the lid - so it cracks.
Remedy - perhaps dip the plaster bats into water briefly before you =
throw on them so that they do not suck the water from your clay quite as =
aggressively? =20
If you don't need the lids to release from the bats quickly then soak =
bats longer so that the clay is essentially air drying - then you would =
probably not need to wax the knob [unless they are drying in a draft],
Regards,
Alistair Gillies
----- Original Message -----=20
From: "Johnnie J."
> Recently I have been throwing lids on domed plaster bats. In the past =
(many years ago) I had great success doing so. Now it seems that often =
the underside of the lids crack soon after the lid has released from the =
bat. I wax resist the knob as soon as appropriate to retard thr knob =
drying faster than the lid. [I do thid to all attachments like knobs, =
handles, spouts, etc.]
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