Jump to content

Strelnikov

Members
  • Content count

    72
  • Joined

  • Last visited

Everything posted by Strelnikov

  1. My wife and I recently received an e-mail invitation to join the Potter's Council for $52 a year. Not having heard of it before, we're wondering if it's worth it.
  2. Potter's Council

    John, Sorry I spend most of my time in this section of the forum, I didn't even notice that there's a Potter's Council section. Sounds like it's worth a try. Thanks, Evan
  3. The picture on the Paragon website looks similar to the S82 kiln my wife has. The top two knobs control the temperature and the bottom one on the kiln sitter sets the timer. For small things we start the firing with the upper knobs at the 1 setting and the lid propped open at the lowest notch for 1 hour. Set the timer for 6 hours for a cone 05 firing. Also plug the lower vent and leave the top vent open. Then after 1 hour close the lid and move both upper knobs to the 6:00 position. After another hour move both upper knobs to the MAX position and put a small mirror close to the upper vent. If there is no moisture coming out then plug the upper vent. Otherwise check every 10 to 15 minutes for moisture and plug the upper vent when there is no moisture on the mirror. For larger objects the ramp up has to be slower to MAX temperature. You will have to experiment to see what works best for what you are doing.
  4. Just curious, I've heard a lot lately about 3D printing plastic and metals. Has anyone heard anything about 3D printing clay? Seems like if it can be done for plastics and metals that it could be done for clay as well.
  5. 3D Printing Clay

    Mostly artsy craftsy stuff but the problem is that my moldmaking skills are primitive at best. Something that would require a 3-piece mold (like her Christmas tree molds) is way out of scope for me. So I got to thinking about 3D printing - where I could potentially do a lot more than is possible with molds.
  6. 3D Printing Clay

    Thanks for the great replies folks. My wife keeps challenging me to make molds for some things she wants to make, some of which would be very difficult to do with conventional molds but very easy to do with a 3D ceramics printer. Doesn't look like we'll be getting one anytime soon but I figured somebody somewhere had to be thinking similarly regarding the technology. Evan
  7. 3D Printing Clay

    My dentist just got something like this (if not the same thing). I didn't at the time make an association with ceramics. But yes it is a computerized system to make crowns. His system came from I believe Germany and is a subtractive system so it's more like a CNC machine for dentists.
  8. I have a mold in which as the slip dries it cracks. What causes this and what can be done to prevent it? I'm using slip straight from the shop, no used stuff added.
  9. Cracking In Mold

    Yes it is, it's plaster. Be really careful and visualize the effect the change has, before you start with alterations. Okay thanks very much.
  10. Cracking In Mold

    It doesn't seem to be getting caught on anything. It is shrinking away from the mold, it just starts cracking as it shrinks.
  11. Cracking In Mold

    Peter, Yes it's a 1-piece drop-out mold that I made myself. The cracking doesn't start appearing until the piece is almost ready to release. I think I'm going to try to modify the mold a bit to see if the cracking problem goes away. I made two other 1-piece drop-out molds that are working fine. Thanks very much for your help. Evan
  12. Cracking In Mold

    It cracks as it dries before it is pulled out of the mold. It is a bowl that is raised in the center. I think the problem is that the corners around the center part are not smooth enough. Is it possible to sand a mold to change its shape a bit?
  13. Next thing I need to figure out is how much plaster to mix. The volume of my box minus the volume of the bowl I'm making is 864 cu in which is 3.74 gallons which is 31.3 lb of water. For that amount of water I need 44.7 lb of plaster. But that will make too much because adding the plaster to the water will increase the total volume. So how much water and plaster do I need to fill my 3.74 gallon box? Thanks, Evan
  14. I am trying to make my first mold and have made a wood box to surround the mold. I have some Murphy's Oil Soap to use as a release agent on the inner part of the mold. I was wondering if I could line my wood box with a black plastic garbage bag so the USG No 1 Pottery Plaster doesn't leak out of the wood box. I have read that the plaster heats up when it's curing. Will it get too hot and melt the plastic?
  15. Making a mold

    I found out that if I pour the Murphy's soap on the object to be coated and spread it out with a foam brush it doesn't make bubbles. When I got the bubbles I poured the Murphy's soap into a dish and used a wetted sponge to spread the soap from the dish onto the object to be coated. Evan
  16. Making a mold

    I made another mold and used Murphy's Oil Soap instead of vaseline as the release agent. It worked much better than the vaseline. I mixed the plaster with a paint mixer powered by an electric drill. I jiggled and shook the mold and a bunch of air bubbles came to the top but I still had some air bubbles at the bottom of the mold as before. Evan
  17. Making a mold

    I'm a bit confused but I think you're talking about a 2-piece mold. I am making a simple 1-piece mold. Evan
  18. Making a mold

    I'm going to try Murphy's Oil Soap next and pull the boards sooner than I did the first time. The vaseline didn't work so good. There were places where the plaster stuck to the wood even where I put on a liberal coating of vaseline. Evan
  19. Making a mold

    Damn! I was right again. Jim Jim, I need to get a grand piano. An old Steinway would do just fine. And the time to learn Rachmaninov's Piano Concerto No 3. Evan
  20. Making a mold

    Okay thanks for the tip. Evan
  21. Making a mold

    I could try sanding the bottom to get rid of the bubble holes. Either that or next time I pour a mold I could pour a bit in the bottom to cover the holes (if that would work). I don't think the damage at the rim is going to be a problem. I just won't be able to pour slip all the way up to the rim. This mold was mostly a practice mold although I will at least try it to see how it works. My wife (the potter in the family) wants me to make a beer stein mold that will have to be a two-part mold. Before I tackle something that complicated I wanted to make sure I could confidently make simple one piece molds. I would have tried the Murphy's soap but it didn't cover up the mistakes in my woodworking skills (not my day job) and the Murphy's soap really bubbled a lot. Because of that I went with something thicker like vaseline. Evan
  22. Making a mold

    Thanks Mark the credit goes to you and everyone else who helped me out. Will do the steps to get rid of the bubbles next time, I read your post about this after I had already poured the mold and the top had hardened. What brand of green soap should I use? Evan
  23. Making a mold

    Interestingly enough the top of the mold was cool but once I opened it up the inside was still hot. There is some damage on the top of the mold and some air bubbles at the bottom. The sides are okay but are a little greasy from the vaseline. I'm not too concerned about the damage at the top but the bubbles at the bottom bother me. Is there any way to fill them in and smooth off the bottom? Once again thanks so much to everyone for your help! I can't believe my first mold might actually be usable! Evan
  24. Mixing plaster

    Thanks, the amount of plaster I mixed for my first mold was ideal. Not too much,not too little, just a bit left over. Evan
  25. Making a mold

    Looks like I missed my window of opportunity. It got really warm but has now cooled off. I will see if I can get it apart. Thanks, Evan
×