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I trimmed some small mugs using porcelain clay    ( always a bit of a struggle for me  !!!) But today noticed some became almost” impossible “to trim Am trimming without a foot ..... But found that the bottom of the mug started a “ ripple effect( if this the right term ) which continued less than half way down  “ Am wondering is this due to  1) not being  well centered for trimming ? 2 )Not following the inside shape Or due to some other reason ??

Kind regards Nicky

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+1 on a pic!

...tools try to follow the contour of the clay; to establish roundness, particularly for the outside and bottom of the foot, I've found a needle tool works well.  Although a bladed tool will make round, it is more difficult (for me) to hold the tool rigidly enough, and it takes longer.

ditto on sharp! I dress my tools with a file - haven't yet invested in tools that a file won't touch (hardened).

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If your porcelain has dried a little unevenly, the difference in 'drag' on your tool can get a 'wave' started that is hard to repair. Stop the wheel immediately and determine where your high/low spot is. You may be able to correct the area by hand scraping before (carefully) completing your wheel trimming. Re-moisten the rest of the untrimmed bases that remain on your board, cover lightly with plastic until moisture is distributed evenly. 

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Some people actually use that chattering to put texture on pots using different tools for different effects.  There are some stainless steel tools that are very sharp and good for porcelain. 

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On 8/5/2019 at 4:10 AM, Rae Reich said:

If your porcelain has dried a little unevenly, the difference in 'drag' on your tool can get a 'wave' started that is hard to repair. Stop the wheel immediately and determine where your high/low spot is. You may be able to correct the area by hand scraping before (carefully) completing your wheel trimming. Re-moisten the rest of the untrimmed bases that remain on your board, cover lightly with plastic until moisture is distributed evenly. 

I've found a sureform corrects stuff like that really quick, but can remove a lot of material if you're not careful

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