they were making a core. you can see a finished version at 1:48 with both halves together. this is used to make a void (or hollow cavity) within the finished part. the core is placed within a larger mold and is engulfed by the molten metal, so when the part is removed it has a plaster center which is then carefully chipped away.
this is not the actual robotic arm mold. the one you mentioned in your other comment is for just the core. the core mold is made of wood and urethane (i think). the larger mold is either silicone or some type of rubber.
if i remember correctly, they have a vibrating table that removes any bubbles on the mold surface. air bubbles else where in the mold aren't an issue because they don't affect the surface finish.
Hi my name is Jose Jimenez, please look at my viedos, I have hundreds of molds for sale. I do NOT have time to start a business with them so they will go to the first "reasonable" offer I get, this is NOT SPAM, please look at my videos and you will see just how many I have ! (209) 612-0566 thanks !
plaster molding must be baked to lose moisture, and could lose strength if overbaked. You are also limited in terms of temperature so so can't use many alloys. On the otherhand you get good surface finish compared to sand casting and it is more accurate
plaster is "gypsum" a rock. you can either dig it up out of somebody's yard and crush it in to a powder. or buy a big bag at your locale hardware store. it's cheap.
cool stuff... there is a lot of interest for videos like this. everyone is welcome to check out my profile for more mold making and sand casting videos. -hank
dude I major in architecture and i dont get the hang of my latest project:-making models out of plaster...how long do you wait for an object as big as a playstation 3 to set???please
If you put it in an oven, I think it should take a few hours at 300 F. Air drying would take a long time to fully set, but if you aren't pouring hot material, as long as the pattern is removable you should be alright. *Note, this is just what I can recall from a report from a year ago, so keep that in mind.
When I worked at Classic Artworks/New Kirby we used silicon molds to cast pewter and resin miniatures. It was simple and the molds lasted a long time. We used to sculpt originals in Sculpty and Super Sculpty and we did not use a mold release, you will need one though if you want to do it with Roma Plastilina. The original was often destroyed when the mold was cut in half. So save the first cast as a copy for future molds. This site has the materials. hobbysilicone. com/Silicone. htm
thanks sooo much for responding,the first month i bought blue silicone mix and have yet to open the box...i wanted to test out an cheaper alternative "clear silicone ducting meterial"
thogh it worked for small magnet sized project it..sorta ruined my wolf figurine..
sence then i gave up mold .
ill remake a pre figure to set up with the silicone i bought.
lotta work down the drain but it will make up for its self.
now i jsut need to get good plastic resin like kind these figs r made of-->
I have not worked in miniatures or special f/x since the early 90's so I really do not have too much to share on the topic, just a burnout I'm afraid. Yet I did some searching and found a real nice site, kind of a one stop shop. They have both molding materials as well as casting resin, also they have how to's and a small equipment page that includes vacuum pots to force air out of the molding medium, and pressure chambers to squeeze the detail out of the casting. Try
love the video really good
MrBrucebracey 3 weeks ago
very interesting thanks
osclarkos 1 month ago
I'm so confused with these mold videos. What the heck was the part at 00:24 all about? Confusing
dialectical44 3 months ago
@dialectical44
they were making a core. you can see a finished version at 1:48 with both halves together. this is used to make a void (or hollow cavity) within the finished part. the core is placed within a larger mold and is engulfed by the molten metal, so when the part is removed it has a plaster center which is then carefully chipped away.
stick1984 1 month ago
If you already havve a pattern of the robotic arm, why do you need to make a mold of it? What is the pattern made of?
dialectical44 3 months ago
@dialectical44
this is not the actual robotic arm mold. the one you mentioned in your other comment is for just the core. the core mold is made of wood and urethane (i think). the larger mold is either silicone or some type of rubber.
stick1984 1 month ago
How did you get all the air bubbles out of the plaster which I see is created in the video when pouring into the mold???
sykopus 4 months ago
@sykopus
if i remember correctly, they have a vibrating table that removes any bubbles on the mold surface. air bubbles else where in the mold aren't an issue because they don't affect the surface finish.
stick1984 1 month ago
Clueless.
Jud6572 6 months ago
When these are poured with aluminum, how hot is the plaster mold pre-heated to?
jrstudioboss 8 months ago
This has been flagged as spam show
Hi my name is Jose Jimenez, please look at my viedos, I have hundreds of molds for sale. I do NOT have time to start a business with them so they will go to the first "reasonable" offer I get, this is NOT SPAM, please look at my videos and you will see just how many I have ! (209) 612-0566 thanks !
JoseDJimenez 8 months ago
Is there really a job in this ?
KaiserVadin 11 months ago
plaster molding must be baked to lose moisture, and could lose strength if overbaked. You are also limited in terms of temperature so so can't use many alloys. On the otherhand you get good surface finish compared to sand casting and it is more accurate
mohedd 1 year ago
peace ...
jmg1957 1 year ago
damn, you'd have to be very certain the thing you're molding has not even the slightest undercut, else it's not coming off!!!
planetdarwin 1 year ago
would that pettern happen to be a heatsink of some sort???
xXjulimanXx 1 year ago
yup
stick1984 1 year ago
how can i make plaster?
crazyAlexander23 2 years ago
@crazyAlexander23
plaster is "gypsum" a rock. you can either dig it up out of somebody's yard and crush it in to a powder. or buy a big bag at your locale hardware store. it's cheap.
RazedByWolvs 1 year ago
That gypsum slurry is that simply plaster of paris or is it a special blend for RPM metal casting.
backyardengineer 2 years ago
cool stuff... there is a lot of interest for videos like this. everyone is welcome to check out my profile for more mold making and sand casting videos. -hank
jdsprince 2 years ago
dude I major in architecture and i dont get the hang of my latest project:-making models out of plaster...how long do you wait for an object as big as a playstation 3 to set???please
Otake321 3 years ago
If you put it in an oven, I think it should take a few hours at 300 F. Air drying would take a long time to fully set, but if you aren't pouring hot material, as long as the pattern is removable you should be alright. *Note, this is just what I can recall from a report from a year ago, so keep that in mind.
stick1984 2 years ago
ive been looking for a quick alternative to making figures with my sculpy clay, and i was wondering can i use plaster for makiking molds with?
W0LFfreak23 3 years ago
When I worked at Classic Artworks/New Kirby we used silicon molds to cast pewter and resin miniatures. It was simple and the molds lasted a long time. We used to sculpt originals in Sculpty and Super Sculpty and we did not use a mold release, you will need one though if you want to do it with Roma Plastilina. The original was often destroyed when the mold was cut in half. So save the first cast as a copy for future molds. This site has the materials. hobbysilicone. com/Silicone. htm
piwright42 2 years ago
thanks sooo much for responding,the first month i bought blue silicone mix and have yet to open the box...i wanted to test out an cheaper alternative "clear silicone ducting meterial"
thogh it worked for small magnet sized project it..sorta ruined my wolf figurine..
sence then i gave up mold .
ill remake a pre figure to set up with the silicone i bought.
lotta work down the drain but it will make up for its self.
now i jsut need to get good plastic resin like kind these figs r made of-->
W0LFfreak23 2 years ago
I have not worked in miniatures or special f/x since the early 90's so I really do not have too much to share on the topic, just a burnout I'm afraid. Yet I did some searching and found a real nice site, kind of a one stop shop. They have both molding materials as well as casting resin, also they have how to's and a small equipment page that includes vacuum pots to force air out of the molding medium, and pressure chambers to squeeze the detail out of the casting. Try
alumilite. com/index. cfm
piwright42 2 years ago
MUCH APPRITIATED!
thx again for the help!
W0LFfreak23 2 years ago
maybe too professional to understand what are they do,
i don't understand what is it,
huninuk 3 years ago
so... what were you trying to make? not a very informative video.
VS
HighPriestSatanis 3 years ago