Making a Plaster Mold
HTML-код
- Опубликовано: 7 сен 2024
- Here I am making a one-piece plaster box mold. This is useful for casting simple one-sided objects. This is a companion video to my book, The Prop Building Guidebook. You can find out more at www.propbuildin...
Хобби
This is so, so helpful. And this method is less wasteful (in many ways!) as well, which I appreciate. Thank you
the L-shape pieces of woods are great!
thanks for the idea Eric
Eric that is the best video I have seen on making a open mould . Just Brillant .
This video came up as next "recommended" by RUclips......I'd been watching how to repair clocks! lol. Duty bound I felt obliged to watch....glad I did cos Eric you're a star in the making and now I plan to ditch my plans to repair my clock and make a plastercast mould instead :-). Thank you for posting and greetings from the UK
I've never cast metal in plaster, but I've read that for any metal you cast, you need to use a special plaster and it needs to be baked for awhile and cast while hot. Regular plaster has water in it, and since all liquid metals are hotter than 212 degrees F, it'll make the water turn to steam and the mold will burst.
thanks for taking the time to share this. It was very helpful.
Very helpful. I am thinking of casting glass.
Good job Eric !
Thanks for sharing Eric, very cool video : ), keep up the great videos....
Hi! I think painting a layer of lubricating oil on the clay will help you remove the model without destroying it. We use this technique in concrete casting.
would a silicone mold release work you think ?
Great video and demonstration. Thank You.
The major disadvantage of the process is that it can only be used with lower melting temperature non-ferrous materials, such as aluminium, copper, magnesium, and zinc. The most commonly used materials are aluminium and copper. The maximum working temperature of plaster is 1,200 °C (2,200 °F), so higher melting temperature materials would melt the plaster mold. Also, the sulfur in the gypsum reacts with iron
What material should I make my mold from, if I am working with higher temperature melting points of certain metals?
Very Helpful, Thanks Very much, this video helped me a lot in my RC Boat project :)
are you going to jordan
I have a question - (and this is a well shot and informative video by the way) I’m making bowl moulds for ceramic from
A stainless steal bowl. Is it possible to make a mould out of plaster from the relief of a bowl, and then somehow cover the plaster “hump” and then make another mould from an existing plaster mould? I’m aware two lots of plaster touching won’t work - let me know, thanks :)
I think it would be a good idea to add some colorant to the plaster used for the mold, so it will be easier to crack.
I just used the plain plaster from the Hobby Lobby.
Great video, Eric. Thank you for taking the time! Could you tell me what kind of plaster is best to use for casting the Ceiling moulding, fireplace mantels, furniture pieces etc... So basically, i already have a mold of the exact shape ready, i need to figure out the material to use for the cast. any pointers? Thank you in advance
Yes, you can get the clay out, but whatever material you use to cast in the plaster mold will end up trapped. Any rigid casting material, like plaster, clay, resin, or rigid foam, will be stuck inside with even the slightest of undercuts. If you cast with a more flexible material, like latex or even paper mache, you may be able to break it free if the undercuts are slight. But really, if you are looking at keeping undercuts in your mold, you should use a different mold material than plaster.
Could you use a foam or similar material to say make a sword, then cast it in plaster on all sides (except for a small pour hole)? Then just bake it to get the foam or similar material out while also hardening the mold? I'm trying to make a sword out of aluminum or pewter.
could you show us how to make a cast from the mold?
What is the material that can be substitute to plaster?
I'd like to use other mediums. For instance, a plastic piece or a piece of bisque or something already glazed. How do I get these NOT to stick in the plaster.
Cal you do this over WED clay
I made clay molds out of plaster for kids to use. The molds are already finished, but I'm wondering how I can make them more tough or "rubbery" on the surface so that the kids won't break the molds if they drop it or something? Any tips? Thanks!
What kind of material could you use in the mold when done? Could you use plaster or cement or what? Does wood or metal also work with a plaster mold?
You can use this as a one-time mold, and in that case, you can have undercuts since you'd just be breaking away the plaster. Of course, you'd be destroying your original clay model in the process, so if your mold doesn't work, you've lost all that work. For lost wax casting, you typically make a mold of your original, than cast that in wax, than build your one-time-use mold around that wax casting.
just wondering if i could met plastic on a gypsum mold and remove it , i'm new to all this
Thanks much for posting this video. I am looking to make a cast for clay figurines..will this process work? Also what brand of plaster are you using?
Is their any way to make a 2 sided mold? I need to cast a tube (or pipe) out of a coustom blend of metals I need to melt and mold personally. I know how to do everything but make a mold for it. Please help if you can.
Can you cast plaster in the plaster mould? Or would it just stick?
Dose any kind of wood works?
I'm trying to make a object made of glutine (bicarbonate + superglue), the mold part is easy, but I'm failing to remove the object I made. It sticks to the plaster. Soaking the plaster mold with vegetable oil before doing the glutine, or with WD40, it did not work. Anyone knows?
My friend sorry for mistake but I am asking about the plaster of Paris , this type is it the similar that used in decoration and regular uses named jepcoum plaster , after making the mold I need to check if u cock the plaster mold before using to cast in ! How much time and degree , thank u my friend .
+Ibrahim Equis It is just regular gypsum plaster. I don't cook the mold, but I do let it dry for a few days.
Hi! do you think painting a layer of lubricating oil on a wood will help me remove the model without destroying the original , or I will need something different for wood.
For the most part, it should all be reusable. The clay should pull away cleanly from the plaster. As the plaster heats, it may soften the surface of the clay it is in contact with, but won't do anything else to it.
good video
Did you rub the sculpture in any sort of parting agent before pouring the plaster?
You can always use the mold to make more clay copies :)
Could you theoretically reuse plaster of Paris, if you ground it up again when dried and repeat the process?
+SiCoope Yes, but there is more to it than just grinding it up. It would need to be heated as well. I've never done it, but this site has some information to help you get started: www.instructables.com/community/Reusing-Plaster-of-Paris/
+Eric Hart Thanx
Can you show how to do a full 3d one? for things like making hilts
i really like your process. can you use air dry clay?
Great video!! Thank you!!
Can I create a plaster mold and use silicone to cast? I have a small, flat, somewhat detailed, one-sided item that I will have printed on s 3D printer and I need the resulting cast to be flexible.
What is plaster the best mold material for preserving detail? Think a lace pattern in terms of detail. Thanks in advance.
+Donna Shanks You can cast silicone in plaster. The tricky part will be making the mold of the 3D printed part; you want to make sure you are able to remove the part after making the mold.
Plaster is pretty good at preserving detail. Use a pottery or art plaster rather than the hardware store plaster. Make sure it is fresh and sift it well before mixing.
+Eric Hart Thanks so much. Yes, I was hoping that there is something I could coat the item with.
I just realized an error in my earlier description. Sorry. It isn't one sided. It's a stencil that needs to be flat and thin because I will be airbrushing. I'm creating stencils for a home project. Would a silicone mold be better for that?
i have the plaster mold an i want to cast in epoxi resin what i have to do please make a video ?
What casting materials are suited to a plaster mold?
Hi, i have a question, I'm making a plaster mold, and i believe it has cooled down, but I can't turn it around and clean it up yet, and only will have time to do it in a few days.. Is that a problem or can I leave it like this and take care of it properly after 3 days?
It depends what you made your model out of. If it is oil clay, it should be fine.
is a make a plaster molt i cant use aluminium to fill? or whil crack?
is it possible to spray a silicone mold release over the clay before creating the mold to help extract the sculpt after ?
or would the release spray cause issues with the plaster ?
The mold release might help a little bit. However, most of the problem is just the suction holding the clay to the plaster. The clay is not strong enough to be pulled out as one piece without deforming or tearing apart.
Using a mold release might present some other problems. If you want to use the plaster mold for absorption casting (either latex or slip clay), the mold release will stay on the plaster and create a barrier for the absorption unless you carefully cleaned it all out. And a silicone mold release may end up on the cast itself, which will prohibit paint from sticking to your cast if you wished to paint it.
@@EricHartProps what about using liquid mold soap as a parting agent?
Where do you get your plaster of Paris material? Is it resistant to cracking?
I see so just normal gypsum powder , can we try to dry it in an furnace to save time ?? Thank u
+Ibrahim Equis I've never done that, so I don't know what temperature to dry it at.
+Eric Hart thank you my friend
This is a simple yea or no question. Would plaster of paris hold up to 2000F temp? Like use it for a Copper/Silver/Gold casting mold? I'm not talking about Pounds of the metal buy up to 10- 15 ounces?
+Christopher Sanchez Plaster is definitely used for casting precious metals, but the process is different than in my video here. If you use a mold like one I make in my video, the plaster will crack or even explode when you pour liquid metal in it. Do a search for "lost wax casting".
+Eric Hart yes lost wax casting..
My friends made some beautiful rings, badges and badge pins using gold and silver, cast in plaster of Paris. Sometimes it cracks the mould, I think that's only if its a massive temperature shock between the hot cast and cold mold. They look amazing when he's finished them. Not to get political but they remind me of the Nazi ss type badges with skulls. All he saves are ALU beer cans and turned into nice hobby.
+SiCoope so it would be good to preheat a mold before the pour! maybe use one small toaster oven..
+Christopher Sanchez Yeah, I think that's how he fixed the problem. he's got me interested in starting molding now. I'm in process of making an hairdryer diy mini ALU can smelter myself. Made a nice catapult once in sand and lost polystyrene method, I'm wanting to do a deer skull with antlers next as a coat hanger.
thanks :)
can I use plaster of paris
what type of plaster did you use?
hello, i would like to make a plaster model. i have a wooden object i want cast, i first make a mold with soft clay(wet clay). can i mix 50% sand and 50% plaster of paris together to create a textured surface? would the plaster model break as the sand is making the bond of the molecules weak? i would much appreciate the help .
+EliteDnaTrix If you make a mold, than the outer surface will have the same texture as the original. Using a sand/plaster mixture will not really add a texture to the cast. And it would probably make the plaster a bit weaker as you thought.
You either want to add texture to the wooden object before making a mold, or make a cast and then add texture to that.
+Eric Hart thanks for your reply. the texture I would like to achieve is similar to a rough cement. if I do it with cement the casting will shrink when it cures. how about adding cement to the mix?
+EliteDnaTrix I've never tried mixing plaster with anything, so I don't really know what will happen.
+Eric Hart ok thanks for your help
what exact kind of clay did you use?
Brown Plastalina, by Van Aken.
Eric Hart
thanks!
👏👏👏👏👏
I did not. The oils in the oil clay are enough to act as a parting agent against plaster.
+1 for the mask (my PM detector becomes crazy by simply slowly pooring the plaster)
where did you get your t-shirt from?
Thrift store
+Eric Hart Education City ... dope
Can I use such a mold for casting aliminium?
I wouldn't. The heat from the aluminum will cause any water in the mold to turn to steam and blow the mold apart. You can get a different kind of plaster that's more suitable for casting metal, but you have to make sure it is completely dry, and you actually bake it so it is hot when you pour the metal.
Ok I will research about other plaster but your tutorial was really helpful nontheless. Thanks!
You're gorgeous and have a great sounding voice. Great tutorial.
Sorry I didnt seen them
please make aquarium toy
Art you graduate in art?
Chris Ray Gun's brother.
good ol' german engineerin!
Don't you find it odd that a picture of a demon appeared on the back of the paper?
The ink bled through because of the moisture. I had sculpted the clay on top of a reference image which I had printed out.
1 good 2 good 3 wear I mask
666 views.. Oh dear
such carelessness made me dislike this video... 1:00 1:20 2:49 3:41 - 4:58 -
will regular plaster of paris work or is it some special ceramics plaster
Plaster of paris and ceramics plasters will all work fine. More expensive plasters used for casting sculptures may be too dense to use for mold making.