#moldmaking — Public Fediverse posts

Here's a question for potters and/or chemists and probably a lot of other people too.

Pottery plaster is mixed with water at a 10 to 7 ratio. That is e.g. a kilogram of dry plaster wants 700 grams of water. Similarly a basic recipe for refractory molds for glass casting is half dry pottery plaster and half silica flour with a dry ingredient to water ratio of 3 to 2.

The problem lies in predicting the volume of liquid plaster produced from a given amount of water and dry plaster. There's a lot of miscibility going on and it's not even close to the sum of the volumes. Andrew Martin* has a recipe that gives one quart of wet plaster and using the ratio it's easy enough to scale it up or down as needed. But there's no such recipe for the glass casting mix, and anyway using a recipe bothers me to some extent -- e.g. how will I figure amounts if I want to fiddle around with the ratio?:What I'm looking for is a direct way from "I need x milliliters of wet mix so I should use y milliliters of water" and then use the ratio to calculate the amount of powder.

So what occurs to me is this: barring technical and irrelevant details like elevation about sea level and air temperature the specific gravity (= weight in grams of one CC) of each of these two mixes ought to be constant. Suppose way pottery plaster has a specific gravity d. Then if I need e.g. v cubic centimeters of mix I know I need vd grams of mix. If w is the amount of water I need and p is the amount of plaster, both in grams, then we should have:

w+p=vd
7p=10w

So 0.7p=w and therefore p=vd/1.7 and w=0.7vd/1.7.We can do something analogous with the plaster/silica recipe. A formula like this would be much easier to work with since d is constant so I could get the amounts directly with just two calculations.

My question is: will this work? I'm worried a little about the assumption that the weight of the wet mix is the sum of the weights of the ingredients. There's some kind of chemical reaction happening with the water and the plaster and it wouldn't be all that strange if some weight was gained or released at that stage e.g. if some atoms are related or absorbed. The thought of mixing and measuring accurately enough is daunting so I thought I'd ask fedi!

*If you want to learn slipcasting Andrew Martin's book The Essential Guide to Mold Making & Slip Casting is fantastic.

#Ceramics #Pottery #Slipcasting #MoldMaking #Plaster

Well it's been a while but me and above all my manager have decided to start a new project.
Meetings have been had and after a clear division of tasks manager had a well deserved nap.
BUT don't worry he'll be there for unannounced quality checks. 🙀

For QC passed works :thinkerguns:

https://thuhstudio.etsy.com

#caturday #workinprogress #siamese #blueeyes #slavedriver #funwithfoam #moldmaking #handmade #livingwithcats #sculpture #architecture #unique #lampmaking #lamp #art #artstudio #atelier #desk

Hi everybody 👋🏻 how's your weekend going? For the last week I've been working on a new project. And I can tell you..
It's gonna be big
It's gonna be heavy
It's gonna be bold..

For finished works checkout ThuhShop at :thinkerguns:
https://thuhstudio.etsy.com

#geometry #abstract #art #handmade #funwithfoam #sculpting #moldmaking #insitu #beton #concrete #architecture #design #object #abstractart #wip #process

Estas fiestas hemos tenido update de las #Pokeball y el proyecto molde.

Resumen: estamos MUY cerca pero hay fallos gordos. Se ve increíble, con mucho brillo y eso que no las he pulido. Pero las burbujas me están amargando. Los bordes están fatal.

Pero bueno, ya casi está, se vienen prontito!

#3D #3Dprinting #moldmaking

More mold making. Really getting the hang of this silicone stuff.

#maker #diy #moldmaking #3Dprinting

Making a silicone mold for a project today. If this works I need to make one about 25 centimeters square. (Though I’m pretty sure this may need some tweaking.) This one is like 10cm square.

#maker #silicone #moldmaking

Silo: a current project at the moment.
Some fun with foam pictures the first and last picture show the study model for ‘Silo’. The two middle pictures show sections of the actual mold in which ‘Silo’ will be poured.

This piece is not available in ThuhShop yet…. but.. for other works → → →
www.thuhstudio.etsy.com

#interior #craft #moldmaking #sculpting #funwithfoam #art #concrete #brutalism #brutalist #architecture #light #sculpture #design #beton #monochrome #model #maquette

Falls sich wer fragt wo neue Würfel bleiben… ich arbeite dran 🙄.

#dicemaking #moldmaking #dicemaker #handmadedice #pnpde

Möge sie mir besser dienen als die letzte!

#dicemaking #dicemaker #handmadedice #moldmaking

Lessons Learned: Plastic Injection Molding for Products - Injection molding is one of the technologies that makes the world go round. But wh... - https://hackaday.com/2023/10/14/lessons-learned-plastic-injection-molding-for-products/ #injectionmolding #moldmaking #undercut #how-to #parts #draft #dfm

Und so sieht die Form aus wenn sie fertig ist.

#Moldmaking #Dicemaker #Dicemaking

I found a mold from an old sculpture I made decades ago. It looks like it has a tear in it, but I *think* I can patch it long enough to get a casting off of it.

I scrounged up some hydrocal, and I'm about to either make a mess, or a bit of nostalgia. :)

#WorkInProgress #Sculpture #TinkeringFootgunFunTime #MoldMaking

@FairLight Esto de #moldmaking lo tengo en la mirilla hace tiempo; agradezco enterarme de los tropiezos 👍

Primera lección aprendida sobre los moldes de silicona que posteé el otro día. Si la pieza a clonar no está brillante, la pieza clonada en resina tampoco va a salir.

Al final, lo que hice fue modelarlo, imprimirlo en 3D y lijarla bien hasta que esté lisa. Pero estaba mate. Parece que tendré que darla un barniz y pulir un poco para después hacer un molde nuevo.

#moldmaking #resin #3Dprinting

Let me put all my #artistsofmastadon onto something - especially if you like #sculpting, #moldmaking, or #resin work.

Do you know about Monster Clay? It's a sulphur free WAX #clay. I love it SO so much. It doesn't get brittle, is easy to work with, and MELTABLE.

I chunk it up, melt it slowly (warm mode for 30 mins) and then pour it into a cylinder or flat mold. As soon as it cools you're ready to sculpt!

#ArtHack #HowTo #Patreon #LearnFromMe

Omnibot Shows Off Over a Decade of CNC Prowess - At first glance, you might think the Omnibot v3 wasn’t anything more than a basic ... - https://hackaday.com/2022/04/23/omnibot-shows-off-over-a-decade-of-cnc-prowess/ #robotplatform #robotshacks #moldmaking #cncrouter #resin #cnc

Modular Box Design Eases Silicone Mold-Making - Resin casting is a fantastic way to produce highly detailed parts in a wide variet... - https://hackaday.com/2021/06/16/modular-box-design-eases-silicone-mold-making/ #adjustable #moldmaking #toolhacks #3dprinted #silicone #casting #magnets #resin

Mold-Making Masterclass in Minutes - Making silicone molds seems easy, but there are a lot of missteps to be made along the way that ca... - https://hackaday.com/2020/08/05/mold-making-masterclass-in-minutes/ #siliconecasting #classichacks #siliconemold #moldmaking #mischacks #casting #sprue

Pumping Concrete - Due to social distancing, gym rats throughout the world are turning everyday objects into exercise e... more: https://hackaday.com/2020/03/29/pumping-concrete/ #weightlifting #moldmaking #lifehacks #concrete #dumbbell #exercise