Impact of Wall Thickness on Pot Volume

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I started working on a new design using Shape Cast. I printed out the design proof and it looked good, but the volume seemed off! Is there a bug in the software? Or is it due to the estimated wall thickness of the final ceramic piece? It turns out the be the second and wall thickness can have a huge impact on the volume of your pot!
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Опубликовано:

6 окт 2024

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Комментарии : 12

@funkyfungi523 4 месяца назад

That was fun working through your problem with you 😁

@PotterybyKent 4 месяца назад

Glad you enjoyed it!

@Bingabuff 4 месяца назад

This is the reminds me of the pizza surface area counter intuitiveness. Going from a small 10 inch to medium 12 inch pizza is only 20% more width, but the surface area jumps from 78.5sq to 113sq, 44% more pizza! (Since area grows exponentially with increase in radius)

@PotterybyKent 4 месяца назад

Exactly and now in 3D!

@corwinmakes 4 месяца назад

1) Are you affiliated with Shape Cast? 2) I think you're assuming that the wall thickness is a uniform offset from the wall of your form. Is that the case? Are the pots thinner at the lip than they are at the base?

@PotterybyKent 4 месяца назад

I made Shape Cast. For this calculation it is assuming a uniform wall thickness (doing otherwise makes the math extremely complicated). With slip casting, the walls are pretty uniform, except for things like corners like I mention. It's not like a thrown pot where there can be much more variation.

@lamardon9723 2 месяца назад

I'm confused about loss of volume due to shrinkage. They do get smaller from the just cast size to the bone dry size, right? So you shouldn't be able to use an item to make a mold for a duplicate, right? It shrinks. Set me straight.

@PotterybyKent 2 месяца назад

Correct, it shrinks. Basically at every stage it will get smaller. From wet clay to bone dry. In the bisque firing, and then finally the glaze firing. For my clay it is 13% shrinkage in total. If you want a "copy" you need to scale up the original by the inverse. So in my case it is scaled up by 1/(1-0.13) = 1.149. As an example, if I want the final top diameter to be 10, the mold would need to be 11.49.

@lamardon9723 2 месяца назад

@@PotterybyKent Thank you very much. Fewer cobwebs in my head now.

@PotterybyKent 2 месяца назад

@@lamardon9723 Great! Let me know if I can answer any other questions.