Cup Wheel
how can i make a 2 part mold out of plaster for terracotta slip casting?
i want to make a cup on the wheel as the subject to mold from.
@ Mike - thanks for that. The site doesnt say wether or not i can use the same process for slip?
@ ? - thank you also! How do you stop the two parts of plaster from sticking together when turned over and put back into the box for the 2nd mold? Also, the registration marks - i can see how they would be put in when making the first mold, but to make the reverse?
the best way to mold a cup is to make a cast of the cup and handle separately, and join them with slip after casting them. To make a two part mold of a cup, you need a take apart box, usually scrap wood, lined with a plastic trash bag, you bury the cup on its side, half way deep ,in clay, you pour the wet plaster over the cup. When this has set up, you place the plaster side in the box and cast the other side, you will need to make 4 round holes in the 1st plaster cast for registration alignment of the two haves,about the size of a Hersey's chocolate kiss. in the prep of the cup before casting the cup needed to be filled with clay and a cylinder shaft half the size of the cup extending to the top edge of the mold, made from clay, this will be the hole in the mold where you pour your clay slip, you need to repeat this for your handle, you can buy large heavy duty rubber bands from a ceramic supplier to hold the two haves of your mold together, if you are planning on make more that one cup, beware that the plaster mold absorbs the water from the clay and takes time to dry out, so you might want to make several molds,if you are planning to produce large numbers of cups
 |
 Saw Blade B20 Router Bit cup Wheel pads Granite  US $139.80
|
 5pc 4 diamond blade 2pc 45 cup wheel 81 4polishing pads US $85.00
|
 Wet Polisher 5 diamond cup wheel 13 pads FREE SHIPPING US $175.90
|
 HOT WHEELS Volkswagen New Beetle Cup Lot of 4 US $7.50
|
| Powered by phpBay Pro |
Hot Wheels Custom Motors Cup Challenge - START HERE!
