Molding and Casting B¶
Group assignment requirements¶
The group assignment for this week is the following:
- Review the safety data sheets for each of your molding and casting materials
- Make and compare test casts with each of them
- Compare printing vs milling molds
find any mold that you are able to use. Any shape works. Gather all the molding and casting materials you have in your lab to be able to test them all
Material 1 : [Gypsum]¶
Safety¶
Add the safety procedure to be followed with this material. Example: eye or respiratory protection, ventilation, exposure to heat, etc..
skin: non irritant, eyes: lightly irritant so wear eye protection and gloves Store in a dry environment [4 months aprox.] Not flammable
General information¶
Mix ratio (if applicable): [32L of cool clear water, 40kg of Mada plaster]
Work time: [5 minutes]
Cure time: [15 minutes aprox]
Cured material state: [solid, white, powdery]
Datasheet and sources:
Links
Links
Process steps & Pictures¶
list and add pictures of the steps to be followed to be able to cast this material. Include weighting, mixing,etc..
The ratio of gypsum to water was 0.8:1. So we weighed the gypsum to be 20g and the water to be 16g.
After pouring the water to the gypsum, we let it sit for one minute before mixing.
Pouring the mixture in the mold which turned out to be too runny.So we added 5 more grams of gypsum to our mixture for a thicker consistency.
Pouring the second mixture to the mold which clearly looks more dense than the first one. It was tougher to pour, but after a few taps, it fit in the mold perfectly.
Result¶
include Your opinion (advantages and disadvantages)
Material 2 : [RTV2 Silicone Rubber]¶
Safety¶
Add the safety procedure to be followed with this material. Example: eye or respiratory protection, ventilation, exposure to heat, etc..
Always work in a properly ventilated area. Wear safety glasses, long sleeves, and rubber gloves.
General information¶
Mix ratio (if applicable): [1:1]
Work time: [30-40 minutes]
Cure time: [4-6 hours]
Cured material state: [very soft to medium hardness]
Datasheet and sources:
Links
Process steps & Pictures¶
list and add pictures of the steps to be followed to be able to cast this material. Include weighting, mixing,etc..
Adding the A and B at a rate 1:1. For example: 100g of A to which add 100g of B. Mixing is done quickly and excellently from all directions. The silicone is poured over the isolated objects from one side, slowly at a height of 20cm, to avoid the entry of air. Leave the mold to dry within 4-6 hours, the time may decrease depending on the room and city temperature, After drying, leave the mold on a flat surface for 24 hours before use.
Our ratio is 1:1, so we used 7.5g from A and 7.5g from B and mixed them together to get the desired ratio, which is a total of 15g.
Next, we poured the final mixture into the mold tray in 2 different holes, one was plain as it is, and we added little gold sparkles to the other one.
Result¶
include Your opinion (advantages and disadvantages)
Material 3 : [resin]¶
Safety¶
Add the safety procedure to be followed with this material. Example: eye or respiratory protection, ventilation, exposure to heat, etc..
Keep out of children’s reach. • Store product in a dry place, preferably in the sealed original container, at temperatures between 20c&25c. • Do not swallow. If you swallowed the resin, call a doctor immediately. • A face mask should be used for pregnant women while using product. • Wear protective gloves when you use the product. • In case the product comes in contact with eyes: rinse cautiously with water for several minutes. • Caution: contact with contents may cause an allergic skin reaction.
General information¶
Mix ratio (if applicable): [5:3]
Work time: [45 minutes]
Cure time: [24 hours]
Cured material state: [Solid]
Datasheet and sources:
Links
Process steps & Pictures¶
list and add pictures of the steps to be followed to be able to cast this material. Include weighting, mixing,etc..
We measured 10g of Resin, and then 6g of hardner
We mixed them both for 3 minutes
We poured it in the first mold shape
Next we added gold flakes
And last we added a green pigment
Result¶
include Your opinion (advantages and disadvantages)
printing vs milling molds¶
select a small 3D file, slice it for 3D printing & prepare it for fine milling. Compare the time it would take both, the process of creating the toolpath, the simulated result, as well as the accuracy / resolution of both machines