Friday, September 25, 2015

09 Plaster Production Molds Nº 309




I clamped the coddles in place and pressed oil clay coils around them to secure them to the mold table, and to seal the seams.





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Wednesday, September 23, 2015

09 Plaster Production Molds Nº 308




I cleaned off the mold table and fitted the coddles. Click on the image to enlarge it.



Arithmetic:
5*4.5*1.5
33.75

33.75/14.44
2.33725

I will mix one pound of water to one and one-half pounds of plaster.




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Tuesday, September 22, 2015

Monday, September 21, 2015

Sunday, September 20, 2015

09 Plaster Production Molds Nº 305




I made enough uninterrupted time to pour the second part of this mold. Plaster sticks to plaster. I applied a parting agent made from a 50/50 solution of water and liquid soap. Click on any image to enlarge it.






I mixed 28 ounces of water and 42 ounces of plaster. Always add plaster to water. I used the mold table vibrator when I poured the plaster. I washed my hands and the mixing container in a 5-gallon bucket of water. Never put plaster (dry, set, or wet) down the drain pipes. Having a lined trash bin, and a bucket of water prepared ahead of time takes a lot of the anxiety out of making plaster molds. I always let the mold setup for at least one hour after pouring. It usually stays there until the next day. One more part to make for this mold.






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Thursday, September 17, 2015

09 Plaster Production Molds Nº 304




This mold half is ready to be poured, but if I don't have a large enough block of uninterrupted free time to pour the plaster, I don't like to apply the parting agent. So hopefully, tomorrow will be the day to pour the second part of this mold. Click on the image to enlarge it.






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Wednesday, September 16, 2015

Tuesday, September 15, 2015

09 Plaster Production Molds Nº 302




First, I tried the coddles I used for the first mold piece, but they were not high enough. So I got out these coddles. After clamping the coddles around the mold piece, I secured it to the mold table with some coils of oil clay. These coils also seal the coddles against leaks when I pour the plaster. I've already carved the registration keys, so I must remember to apply parting agent before I pour. Click on the image to enlarge it.





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Monday, September 14, 2015

09 Plaster Production Molds Nº 301




I have done as much scraping on this mold piece as I am going to do. The same oil clay build up that I used before will work again for the next mold piece. Click on the image to enlarge it.





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Sunday, September 13, 2015

09 Plaster Production Molds Nº 300




I know it looks like I am procrastinating, and I admit it. So I carved three more registration keys and called it quits for the day. Click on the image to enlarge it.





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Saturday, September 12, 2015

09 Plaster Production Molds Nº 299




I didn't have much time to do much today, so I carved a registration key. Really, it was a very busy day, all day long !!!. Click on the image to enlarge it.






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Thursday, September 10, 2015

09 Plaster Production Molds Nº 297




I did a little more scraping of this mold piece. There is this one place where the arm transitions to the ball joint that I think I'm going to have to carve out a little bit. I'm thinking about it. An alternative to carving the plaster would be to put a small piece of oil clay in there. If I did that, it would be something that I would have to trim once the part is slip cast. I'm leaning towards carving the plaster. Click on the image to enlarge it.






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Wednesday, September 9, 2015

09 Plaster Production Molds Nº 296




I am doing a lot of scraping on this mold piece. I am using my paring knife which has the rigid blade. For me, this is tedious work. So it might take me awhile to get it done. This is the type of work that makes me dread going into the studio. I really can't see any way to make it more enjoyable. Click on any image to enlarge it.






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Tuesday, September 8, 2015

09 Plaster Production Molds Nº 295




I removed the coddles from the first mold piece and cleaned up the oil clay as I removed it. It looks like this first mold piece came out good. Click on any image to enlarge it.








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Monday, September 7, 2015

09 Plaster Production Molds Nº 294




I mixed and poured the first part of the mold for the upper arm. I weighed 27 ounces of water and 40 ounces of plaster. Always add plaster to water. I used the mold table vibrator during the pour. I washed the mixing container, and my hands in the 5-gallon bucket of water. Never put plaster (dry, set, or wet) down the drain pipes. Click on the image to enlarge it.





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Sunday, September 6, 2015

09 Plaster Production Molds Nº 293




I finished working on the oil clay build-up. I placed the pattern and build-up on the molding table, then clamped the coddles around it. I secured the coddles to the molding table with coils of oil clay. Click on the image to enlarge it.




Arithmetic:

# Total volume of water in cubic inches
5*6.5*2.25
73.125 cu.in.

# 2/3 total amount of water for mix
73.125*.67
48.99375 cu.in.

# cups of water (one cup = 14.44 cu.in.)
48.99375 / 14.44
3.39291 cups

# 8 ounces of water in one cup, by weight
3.39291 * 8
27.14328 ounces

# one part by weight
27.14328/2
13.57164 ounces

# 2 to 3 ratio of water to plaster by weight
13.5 * 2
27.0 ounces water
13.5 * 3
40.5 ounces plaster

I will mix 27 ounces of water to 40 ounces of plaster.





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Saturday, September 5, 2015

09 Plaster Production Molds Nº 292




I continue to work on the oil clay build-up to the parting line of the upper arm. Click on the image to enlarge it.






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Friday, September 4, 2015

Thursday, September 3, 2015

09 Plaster Production Molds Nº 290




I made a cereal box cardboard template about 3mm larger than the outline of the upper arm. I am allowing about 4cm all around. I used a couple of coddle boards as spacers to roll out some oil clay slabs with an old rolling pin. One will go around the upper arm, and the other will be at the socket end of the upper arm. Click on any image to enlarge it.






I traced the template onto the oil clay slabs.






This is how they will fit together.





The oil clay slabs are a pretty good fit.





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Wednesday, September 2, 2015

09 Plaster Production Molds Nº 289




I went over the upper arm again with sandpaper. I rolled out a coil of oil clay to support the upper arm. I used a plastic card with some carbon paper wrapped around it to make a parting line. Click on the image to enlarge it.






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Tuesday, September 1, 2015

09 Plaster Production Molds Nº 288




I removed the coddles from the mold and cleaned up the oil clay and put it away. Click on any image to enlarge it.






I used a small hammer and my paring knife to open the mold along the seam line.






After removing the carving wax skull cap, I used a pencil to mark the lines for the spare.






I beveled all the edges with the SurForm tool. I cut the spare with the paring knife.






This mold is ready to be banded and set aside to dry.






I banded the mold with some acrylic yard and set it in the corner of the studio near the furnace with the other molds to dry.






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