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Author Topic: Kiln shelf  (Read 2969 times)
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Sandera
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« on: January 29, 2012, 10:47:38 AM »

Urgh - just opened my kiln up to find the shelf has broken into 2 equal parts Cry There's 75 to pay for a new shelf now Cry Cry

My fault I think as I was doing my first open cast mould and placed the rather large heavy mould on top of the shelf which in turn was suspended on the kiln posts. I think the weight was too great as the shelf cracked down the centre. The mould seems to have been weak as well and has broken although no escape of glass I'm glad to say.

In future I'll put a layer of vermicullite on the kiln floor and lay the mould on that.

You win some, you lose some....

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♥♥Tan♥♥
cuntbuckets
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« Reply #1 on: January 29, 2012, 12:24:04 PM »

Gutted Sad
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chipperpottery
Life passes by when melting glass.
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« Reply #2 on: January 29, 2012, 12:53:57 PM »

Urgh - just opened my kiln up to find the shelf has broken into 2 equal parts Cry There's 75 to pay for a new shelf now Cry Cry

My fault I think as I was doing my first open cast mould and placed the rather large heavy mould on top of the shelf which in turn was suspended on the kiln posts. I think the weight was too great as the shelf cracked down the centre. The mould seems to have been weak as well and has broken although no escape of glass I'm glad to say.

In future I'll put a layer of vermicullite on the kiln floor and lay the mould on that.

You win some, you lose some....



Have you tried Hobby cerammicraft at Hook? I am sure my last kiln shelf wasent as much as that.
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Moreton
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« Reply #3 on: January 29, 2012, 01:07:52 PM »

Or Pottery Crafts
http://www.potterycrafts.co.uk/Products/00100007
Just check shape and size and you'r a winner.
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Pete
Glyn Burton
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« Reply #4 on: January 29, 2012, 03:18:48 PM »

Potterycraft do have a good range and even if they are not quite the right size they can be trimmed with an angle grinder or a tile saw. I cut some kiln shelves into strips to use as casting dams using a water cooled tile saw it cut them very easily.
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Stephen Richard
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« Reply #5 on: January 29, 2012, 05:01:38 PM »

It's also about thermal shock of the shelf.  A large mould on the shelf makes it colder under the mould than around it on the rise and vice versa on the way down.  I've done it myself before.  Raising the mould even 10 mm above the shelf reduces the chance of breakage due to large moulds on top.
Stephen
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Flyingcheesetoastie
On Golden Wings of Cheddar...
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« Reply #6 on: January 29, 2012, 06:18:56 PM »

Not sure if your shelf was square or round or whatknot but did you put props in the middle underneath to support the shelf too?  I've luckily never had a shelf crack on me but I'd also shop around for prices as the last shelf I bought which was 50cm square was nothing like that amount.
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Sandera
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« Reply #7 on: January 30, 2012, 01:38:02 AM »

Aggh! Already ordered it online. I hope it doesn't happen again but at least I'll know where to go for a cheaper version.

Thanks for your pointers to cheaper suppliers and suggestions to avoid this happening again. I knew I should have asked here first!
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