Monday, August 31, 2015

09 Plaster Production Molds Nº 287




I removed the coddles. Click on any image to enlarge it.






I cleaned up the oil clay. I trimmed the edges of the mold with the SurForm tool. I will scrape the plaster with the carving knife.






I carved registration keys with my key carving tool.






I clamped the coddles in place and secured them to the mold table with coils of oil clay.






I am applying parting agent to the plaster surface.






 I mixed and poured the second part of this mold.






Links To BJD Tutorials Updated 1 August 2015




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Sunday, August 30, 2015

09 Plaster Production Molds Nº 286




The piece of masking tape marks the level I want to fill to with plaster. The coddles are sealed along the outside seams and clamped securely. Click on any image to enlarge it.






I mixed the plaster. Always add plaster to water. I used the mold table vibrator when I poured the plaster. I washed off the mixing container, tools, and my hands in a 5-gallon bucket of water. Never put plaster (dry, set, or wet) down the drain pipes. I always wait at least one hour for the plaster to setup completely.






Links To BJD Tutorials Updated 1 August 2015




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Saturday, August 29, 2015

09 Plaster Production Molds Nº 285




I used a couple of the coddle boards as spacers to roll out a slab of clay for the build-up. Click on the image to enlarge it.






Because this is a very simple mold, I am only giving one inch around the pattern, instead of the usual one and one-half inches. The skullcap is 0.75 inches tall. The build-up is 4.625 inches by 4.500 inches square.



Arithmetic:

# Mold Volume in Cubic Inches
4.625*4.5*1.75
36.42187 cubic inches

# Two-thirds volume is water
0.67*36.42187
24.40265 cubic inches

# Cups of water (14.44 cuin is one cup of water)
24.40265 / 14.44
1.68993

# Water weight
1.68993 * 8
13.51944 ounces

# One part by weight 13.51944 / 2
6.75972 ounces

# Three parts of plaster
6.75972 * 3
20.27916 ounces

I will need about 13.5 ounces of water and 20 ounces of plaster.




Links To BJD Tutorials Updated 1 August 2015




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Friday, August 28, 2015

09 Plaster Production Molds Nº 284




I cleaned the mold table, then finished cleaning the oil clay. I decided to do the skull cap next because it is very simple. I will make the build-up one and one half inches out from the edge of the skull cap all around. Click on the image to enlarge it.






Links To BJD Tutorials Updated 1 August 2015




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Thursday, August 27, 2015

09 Plaster Production Molds Nº 283




I draw the outline of the spare on the mold with a pencil. Click on any image to enlarge it.






I carve it with the paring knife.






I put the mold pieces together and transfer the lines to the other half of the mold.






I carve it out with the paring knife.






The completed spare. I am running out of rubber bands, so I am using the acrylic yarn to bind the mold while it is drying.






Overall, this mold has some issues, but I am going to try and get a couple of casting from it before I do it over again. This is a snapshot of all the molds I have made, so far. I am halfway finished. Only eight more molds to go.... head, skullcap, right upper arm, right lower arm, right hand, left upper arm, left lower arm, and left hand.






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Wednesday, August 26, 2015

Tuesday, August 25, 2015

09 Plaster Production Molds Nº 281




I apply the parting agent to the left arm socket mold half. Click on any image to enlarge it.






Then to the other mold half.






I reuse the same oil clay coddle.






I mix and pour the plaster the same as for the last piece.






Links To BJD Tutorials Updated 1 August 2015




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Monday, August 24, 2015

09 Plaster Production Molds Nº 280




The right arm socket piece. Click on any image to enlarge it.






It fits just one way, due to the way I carved the keys.






I beveled the edges.





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Sunday, August 23, 2015

09 Plaster Production Molds Nº 279




I am pouring the right arm socket first, so I apply the parting agent to the plaster there. I do one half of the mold at a time. That way, I am sure to get a good coating of parting agent over the whole surface that come into contact with the fresh plaster. Click on any image to enlarge it.






Remember: Plaster sticks to plaster.






I secure the mold to the molding table because I will be using the mold table vibrator when I pour the plaster. Always add plaster to water.






The poured plaster contained in the oil clay coddle. I only saw one small leak which did not go very far. I put the excess plaster into the lined trash bin. I washed the mixing container, tools, and my hands in the 5-gallon bucket of water. Never put plaster (dry, set, or wet) down the drain pipes.






Links To BJD Tutorials Updated 1 August 2015




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Saturday, August 22, 2015

09 Plaster Production Molds Nº 278




I cut this oil clay coddle out of the build-up slab I used for the second mold piece. These are snapshots of the coddle from a couple of different angles. Click on any image to enlarge it.



Plaster Arithmetic:

1.75 Dia. x 2.5 Height = arm socket build-up

radius of arm socket build-up
r=0.875

area of arm socket build-up
pi*r^2
2.40526

volume of arm socket build-up
(pi*r^2)*2.5
6.01315

3.00 Dia. x 1.5 Height = mold piece handle

radius of mold piece handle
r=1.5

area of mold piece handle
(pi*r^2)
7.06857

volume of mold piece handle
(pi*r^2)*1.5
10.60285

arm socket and handle volume added together
6.01315+10.60285
16.61600 cu.in.

two thirds of total volume equals amount of water needed
16.61600*.67
11.13272

cups of water needed
11.13272/14.44
.77096

ounces of water needed
.77096*8
6.16768

one part of water by weight
6.16768/2
3.08384

mold consistency
6/9
.66666

I will need 6 ounces of water and 9 ounces of plaster.





Links To BJD Tutorials Updated 1 August 2015




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Friday, August 21, 2015

09 Plaster Production Molds Nº 277




I removed the acrylic yarn and rolled it up nicely to be used again. The third mold piece has been removed.






Mold pieces one and two separated easily. I need to remove the clay build-up from the arm sockets. I also need to do some beveling, as well as make some registration keys.






The clay build-up has been removed from the arm sockets.






These snapshots show the beveling I did, as well as the two new registration keys.






All the mold pieces have been beveled. I am ready to make the fourth mold piece in one of the arm sockets. The fifth mold piece will be the other arm socket.






Links To BJD Tutorials Updated 1 August 2015




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