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How To Throw Trim Rings?


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Personally, I'd throw the ring separately and fire them as separate pieces- firing the foot ring upside down. Less chance of warping with those long unsupported areas.

You also then have the availability of some nice contrast between the two parts.

Best of luck.

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The level of refinement on that dish suggests to me that the foot rim was trimmed, with those feet probably added on afterwards. Especially because there are no visible throwing marks, I'd say the whole outside was tooled somehow. This one doesn't appear to be glazed, so firing it on the rim would be a good idea, but if you're putting that much effort into a piece, it would be reasonable to throw a support waster if you need to fire it right side up for glazing.

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With a good notch tool, it could be done on the wheel. An old credit card can make such tools.

 

I suspect this piece has more steps than it appears. Many bonsai pots are entirely hand formed. It is possible that the rim and extra feet were added to a thrown form.

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Which "rim" are we discussing?

 

The top rim in the photograph is easy to create as the last step in throwing.  Take a rib and flatten the rim inwards, shape the outer edge with a profile rib (with a light touch), and, at the leather hard stage, trim the inside edge of the rim with a small trimming knife.

 

The bottom rim (foot ring) is generated before opening the cylinder to form the bowl and is cleaned up with a narrow profile rib (that fits underneath the bowl overhang) just after the opening is complete. 

 

 Some trimming will be needed at the leather hard stage on a chuck when the interior of the foot ring is completed.   The "feet" are attached after trimming using a score and slip technique. 

 

Takes planning but seems  doable.

 

That is the plan I would use , at least that is the plan that worked for me on some similar overhanging forms.

 

LT

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