Nicky S Posted August 2, 2019 Report Share Posted August 2, 2019 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 Link to comment Share on other sites More sharing options...
liambesaw Posted August 2, 2019 Report Share Posted August 2, 2019 Sounds like chattering, which is when your tool vibrates on the surface leaving hills and valleys. Holding your tool steady and using a very sharp tool will help Link to comment Share on other sites More sharing options...
Nicky S Posted August 2, 2019 Author Report Share Posted August 2, 2019 I thought so too ..... but know it’s not “ chattering “ as Have experienced that too :-) Link to comment Share on other sites More sharing options...
liambesaw Posted August 2, 2019 Report Share Posted August 2, 2019 Picture speaks a thousand words, Link to comment Share on other sites More sharing options...
Hulk Posted August 3, 2019 Report Share Posted August 3, 2019 +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). Link to comment Share on other sites More sharing options...
Rae Reich Posted August 5, 2019 Report Share Posted August 5, 2019 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. Link to comment Share on other sites More sharing options...
MFP Posted August 8, 2019 Report Share Posted August 8, 2019 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. Link to comment Share on other sites More sharing options...
liambesaw Posted August 8, 2019 Report Share Posted August 8, 2019 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 Link to comment Share on other sites More sharing options...
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