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Smooth Bottoms On Kiln Fired Cups


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#1 sprestel@verizon.net

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Posted 09 March 2014 - 05:39 PM

Recently I have purchased two coffee mugs with exceptionally smooth feet below the fired glaze. I have been a hobby potter for years and cannot figure out how the potter got the porcelain so smooth on the bottom of the mug. One of the mugs has a rounded bottom with no feet but a smooth unglazed area where the glazed stops. I have a bunch of mugs that are bisque fired and ready to glaze but i would love the bottom of them to be like the ones i have purchased. Can anyone help me with this?

 

I have been with CAD for years and gained much knowledge from all of you so thank you for all of your posts everyone!



#2 JBaymore

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Posted 09 March 2014 - 05:49 PM

Likely some sort of post-high fire grinding.

 

I use diamond on the feet of some gnarly wood fired stoneware work...... cones out like fine finished marble.

 

Look up the product called "Glaze Eraser" which is basicallty the same material as Advancer kiln shelves in a disc shape that fits a wheel.  Not diamond... but does a decent job.

 

best,

 

.........................john


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#3 Tyler Miller

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Posted 09 March 2014 - 06:37 PM

I'm a big fan of Gesswein stones for my work, but then again, I have a bias toward doing things by hand.  Ruby stones, if you can afford a set, do a very nice job.  http://www.gesswein....uby-stones.aspx



#4 flowerdry

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Posted 09 March 2014 - 06:39 PM

just google "diamond polishing pad" and you find places that sell these hand held pads made for stonework.  You can get different grits.  The very fine grit will put a smooth finish on your bottoms with just a few swipes.


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#5 Colby Charpentier

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Posted 09 March 2014 - 06:51 PM

If you can't quite swing the price of the diamond pads, sandpaper will do fine in most circumstances, both a bisque sanding and a post-fire sanding... 150 grit is fine for this.

#6 GEP

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Posted 09 March 2014 - 06:52 PM

just google "diamond polishing pad" and you find places that sell these hand held pads made for stonework. You can get different grits. The very fine grit will put a smooth finish on your bottoms with just a few swipes.

+1 for the diamond polishing pads. The right grit for stoneware is between 150 to 250 grit. They cost $10 to $15 each, but you only need one, and it will last about 20 years.

Edit: google "diamond HAND polishing pad" and you'll find the block style of polishing pad, as opposed to discs and sheets.
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#7 bciskepottery

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Posted 09 March 2014 - 07:08 PM

http://www.toolocity...shing-pads.aspx

They provide good service; been using them for years.

#8 Biglou13

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Posted 09 March 2014 - 07:12 PM

COURTSEY OF BCISKE

 

http://www.toolocity...shing-pads.aspx

 

I LOVE em us every day    100 is go to grit


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#9 ayjay

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Posted 10 March 2014 - 01:37 PM

 

 

. I have a bunch of mugs that are bisque fired and ready to glaze but i would love the bottom of them to be like the ones i have purchased. Can anyone help me with this?

Diamond pads are the way I go at that stage.

 

I also use a rubber rib (Mud Tools - red) at the greenware stage once the footring has been trimmed, just a few spins while still on the wheel smooths it off.



#10 sprestel@verizon.net

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Posted 10 March 2014 - 04:38 PM

Thank you all so much for all of your great suggestions, i really appreciate the help! Ive ordered the items suggested and look forward to a smooth future! Thanks!



#11 TJR

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Posted 10 March 2014 - 05:26 PM

I like a smooth bottom as well.Just sayin'

TJR.



#12 bciskepottery

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Posted 10 March 2014 - 07:01 PM

Thank you all so much for all of your great suggestions, i really appreciate the help! Ive ordered the items suggested and look forward to a smooth future! Thanks!


If you ordered the diamond pads, just dip them in water and then smooth the bottoms. Keeps the dust out of the air.

#13 Mark C.

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Posted 11 March 2014 - 03:54 PM

I use many things on my porcelain but the 100 grit diamond works well as noted above.

The other item few know about is like what John refered to above but its not the $200 pad for your wheel.

Its the same stuff only in a 2x2x5 -1/2 inch rubbing stone from the same people Smith Sahrp Fire brick supply

They are called the glaz erazer hand tool

Heres the e-address

http://www.glazeeraser.com/

I bought two last year and rub all pots with them now-then use the 100 grit diamond pad.

The shipping is a bit high but the tool works great

I have bought all my shevles from these folks ( Dona) and they are very easy to deal with.I wish they gave kickbacks as I have sent them lots of sales.At one time they where the only USA saint-gobain-logo.gif distributor. They may still be.

Mark


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