Many fine details are made of plastic. To cast necessary details, special forms will be necessary for you. They can be folding and one-piece. Let's talk about subtleties of use and that and others.
Instruction
1. If you make a symmetric detail with a simple configuration, then use the folding form consisting of two halves. When forming plastic foundry models just press them into not stiffened plaster to the plane of symmetry and let's stiffen. Before filling in moisten a front part of the second half of a form with weak soap solution, it will make process of division of half simpler. On the top part of a form make a through opening with a diameter of 3-4 mm. After you took out model from a form, put both half and fasten them among themselves by means of a twine or rubber.
2. It is possible to use a one-piece form also. Such forms do of paraffin, then fill in with plaster solution, in the top part there has to be an opening with a diameter of 3-5 mm (ingate). After the form stiffens, put it in cold water an ingate up and you boil until the foundry model does not melt. Water forces out paraffin from a form and it emerges on a surface. Then cool water and remove a paraffin layer from its surface. Repeat heating to remove residues of paraffin from a form. As a result you receive in plaster a cavity, imeyushcheyu a form of the necessary detail.
3. If you need fasteners in future detail, then insert them into paraffin foundry model, it will prevent its shift when smelting. For example, if in a detail the metal nut is required - put it the acting bolt and fill in all with plaster, after paraffin smelting plaster will hold a nut in the necessary situation. At such type of a form prepare plastic in glasswares, giving it consistence of liquid sour cream.
4. Plastic preparation. Take the acrylate powder AKP-7 previously based on solvent to a condition of the test. Pour out weight in a form, previously having humidified it. Take the filled form at the room temperature within 15-30 minutes, and then condense it through a pouring opening by means of wooden or a glass stick.
5. The condensed weight has to recede from the upper edge of a form on 3-5 mm. Close a pouring opening the moistened cellophane and a scrap of plywood, then tighten the clamp. Ship all this in water of room temperature and bring to boiling, boiling has to be not rough and proceed about 45 minutes. Later stop heating and take a form in water of minutes 15-20.