Not just yet. I've been focused on one part molds with Shape Cast. I do want to get it to the point where it can do these kinds of 5 part molds.
@Bingabuff2 күн бұрын
This is the reminds me of the pizza surface area counter intuitiveness. Going from a small 10 inch to medium 12 inch pizza is only 20% more width, but the surface area jumps from 78.5sq to 113sq, 44% more pizza! (Since area grows exponentially with increase in radius)
@PotterybyKent2 күн бұрын
Exactly and now in 3D!
@ozzig.26672 күн бұрын
Thanks for sharing this, at the moments im trying my own glazes, a hug from Chile.
@PotterybyKent2 күн бұрын
Good luck with them!
@Heartwing373 күн бұрын
I’m really enjoying your series on slip casting and mold making! I’m super novice when it comes to 3D printing. What machine do you use/recommend? Thank you and keep up the good work!
@PotterybyKent3 күн бұрын
I think any of the new fast printers are probably a good choice. I got myself a Bambu p1p the end of last year and it is both fast and just works.
@sydneydickson90913 күн бұрын
Okay so the main thing I was looking for was the “math that I won’t bore you with” haha! I’m struggling to find the weight of the raw vs liquid. Is it just specific gravity?
@PotterybyKent3 күн бұрын
You just need to rearrange the equation for water, dry ingredients and final weight. So if Dry is 1 (D), water is 90% of that (.9*D) then total is 1.9. D + 0.9*D = 1.9D. Change the 0.9 based on your water ratio. I had 1543g total. So 1543/1.9 = 812g of dry ingredients. This isn't exact but is close. Then you can add x% of colorant based on the 812g. So 1% is 8g.
@markkeown95323 күн бұрын
Keep it simple. Yes you are adding air when power mixing - so don't power mix - mix by hand gently.
@PotterybyKent3 күн бұрын
That is not what the manufacturer recommends! Not power mixing impacts the strength of the mold a lot.
@samanthamanalang37304 күн бұрын
What kind of compressor is this? The one we have is super loud and too strong when I tried it. unfortunately I don’t have a gauge to change the pressure
@PotterybyKent4 күн бұрын
You need a pressure regulator for sure! Full pressure is too much. This was just a cheap compressor that actually died not too long ago and I replaced it with this one from California Air Tools and it is much much quieter: amzn.to/3R3EbQy
@barkleyhunt90044 күн бұрын
thanks great video
@PotterybyKent4 күн бұрын
Thanks!
@user-qy1tk1lg4y5 күн бұрын
That was fun working through your problem with you 😁
@PotterybyKent5 күн бұрын
Glad you enjoyed it!
@corwinmakes6 күн бұрын
1) Are you affiliated with Shape Cast? 2) I think you're assuming that the wall thickness is a uniform offset from the wall of your form. Is that the case? Are the pots thinner at the lip than they are at the base?
@PotterybyKent6 күн бұрын
I made Shape Cast. For this calculation it is assuming a uniform wall thickness (doing otherwise makes the math extremely complicated). With slip casting, the walls are pretty uniform, except for things like corners like I mention. It's not like a thrown pot where there can be much more variation.
@sssur326 күн бұрын
Thanks for the interesting videos. Tried signing up for shapecast, but don't see how to access it. I've been designing my plaster molds using fusion 360, and am looking at using openscad to more easily change design parameters.
@PotterybyKent6 күн бұрын
Hmm. You should be able to sign up for the wait list. If not send me an email and we can try and see what's going on
@naveenkonduru37 күн бұрын
Hi, is it possible to create a cast for hallow s shape?
@PotterybyKent7 күн бұрын
You would need a multi-part plaster mold to create an S shape
@Counselingforlife8 күн бұрын
This is exactly what I was looking for… thanks so much 😊 only problem is how to define “awhile longer” “for a bit” not sure how long 1. Between layers (I think I read in a comment one hour?!) and also 2. How long do you leave when you fill completely? Thanks so much!
@PotterybyKent8 күн бұрын
Glad it was helpful. I didn't say precise times because it really depends on your slip, your molds, and your weather. Try it out and if it's too thick you waited too long, and vice versa! For my slip and my molds I usually let the slip sit for about half an hour for a normal pot before dumping it out. So for the layers, less time for each color, but probably more total so you have thicker walls to carve. The timing between layers, you probably want to let the slip dry enough to stop being runny (maybe 5 minutes? again it depends). If you go faster it's ok, but it will likely marble. And finally if it doesn't work out, let the clay dry out and rehydrate it later to use again! (You'll just have a mystery color to work with)
@sporkymail10 күн бұрын
Maybe make the holes when it is leather dry, or even when it is totally dry. Alternatively you could drill them after a bisque fire
@PotterybyKent10 күн бұрын
I was originally trying to make them when it was leather hard and my clay body wasn't happy which lead me here (I've got several other videos on that). I don't think I have the patience to do it when it's bone dry. I hadn't thought about doing it once it was bisqued.
@thehumblefactory10 күн бұрын
You can get silicone jacketed electrical wire, which is for heat resistant applications. It's pretty cheap, comes in a variety of diameters, and you could just cut a bunch of whatever length you needed. It's flexible, which is not ideal, but at a larger diameter like you have, that probably wouldn't be a problem.
@PotterybyKent10 күн бұрын
Any ideas for sealing off the cut end as well?
@1toxic7511 күн бұрын
put a sacrificial material on the opposite side you are drilling from to support the clay as you drill through should stop the break out
@PotterybyKent11 күн бұрын
Unfortunately it does not. And even if it did, that would be hard to do in the full sphere form.
@loganwintry994511 күн бұрын
Im confused. I keep hearing people mention "slip" but what is slip? How do you make it? And can the same be accomplished with cement? I've been using fast set all crete for my projects and have attempted "slips" many times but it cures too quickly and becomes clay like even after 5 minutes. So there is no pouring out the excess
@PotterybyKent11 күн бұрын
Slip is specially formulated liquid clay used for ceramics and is fired in a kiln once dry like other ceramics. It is a very different material than concrete.
@alodin1112 күн бұрын
What if, instead of drilling holes in the plaster mold, you cast the plaster mold in such a way that the holes are cone-shaped, with the inner diameter being slightly smaller than the outer diameter?Wax or silicone pins can be cast with the same angle at the cone tip, and a length such that they protrude a sufficient distance on the outside of the mold to be conveniently removed from the hole, and on the inside, they protrude 2-3 mm above the wall thickness of the casted slip. The cone-shaped holes will allow for a complete seal, preventing the slip from entering and also allowing light rays to travel parallel to the hole walls.
@PotterybyKent12 күн бұрын
I was able to get a good seal in previous attempts with the right size hole - no need to use a cone.
@mattiasfagerlund12 күн бұрын
I think casting your own silicone pins would be trivial - you could design a "head" that prevented it from slipping too deep into the hole. A single 3d- printed mold could contain 10x10 pins and you could get 200 pins in 2 castings. Note that the silicone should probably be quite soft and viscous so that you could fill your mold without air bubbles. I could whip up a demo model if you're interested.
@PotterybyKent12 күн бұрын
I think the trick with casting one's own would be getting a good surface finish so the geometry didn't pose any retention issues. And as with the other comments about adding a head - it wouldn't be that helpful for all of the orientations needed and if the tolerance was ok like my last videos I could just place it in the right spot.
@alodin1112 күн бұрын
Why not try inflating a rubber balloon inside the mold to push the wax pins out enough so they can be easily removed from the outside? Additionally, this could help smooth out the internal surface.
@PotterybyKent12 күн бұрын
The balloon would move to fill the area of least resistance.
@ingegerdandersson696312 күн бұрын
Press them out from the inside so you can pull from the outside
@PotterybyKent12 күн бұрын
I can't get to the inside of my sphere mold which is my target form.
@ianswenson316613 күн бұрын
Why pull the wax pins at all? Just melt them or let them burn off?
@PotterybyKent12 күн бұрын
Because I need to get the clay out of the mold. Beyond that, the wax would prevent the clay from shrinking as it dries and would likely cause cracks.
@garymarsh2313 күн бұрын
How about 2.85mm diameter 3D printer filament? OD is well controlled + cheap, and plastics like PETG should be fairly smooth surfaced and hydrophobic. Exoeriment with 1.75mm filament first and see where you end up.
@PotterybyKent13 күн бұрын
I'm really looking for something closer to 4mm. I don't want to go below 3 for my particular use.
@garymarsh2313 күн бұрын
Also another idea - push the end of each pin against a warm surface to "mushroom" the end to a larger diameter, this'll keep it from going through the mold and it'll give you a bit of a handle to grab onto from the outside. For the tolerance issue, you might be able to make a gauge to sort your pins and eliminate the fattest/thinnest ones.
@PotterybyKent13 күн бұрын
The idea of making one pin fatter is in another comment here, but that doesn't work since the orientation also matters with the pour tolerance. With a good one, it wouldn't matter.
@ShaneGadsby13 күн бұрын
I know this suggestion is a little more labour intensive, but what about trying the wax holes in a smaller size, then drilling? Usually drills only have tear-out/break-out when their web can't fit through the material at the centre (most drill bits don't cut at the centre, and even those with a cutting web the centre spins so slowly that the cutting speed is effectively 0rpm), this is why it's common to first drill a smaller pilot hole in tear-out/break-out-prone woods and metals, usually just a little larger than the final drill bits web dimensions.
@PotterybyKent13 күн бұрын
Great point about the drills and yes that is an interesting thought! It's worth a try to see what happens.
@ScenterSquare13 күн бұрын
Would a quick blast of air before pulling the pins remove the extra artifacts?
@PotterybyKent13 күн бұрын
I'm not sure if there'd be space for the clay to release in that case. When I use air for regular parts, the shrinkage of the clay is in my favor - pulling away from the plaster walls. Here the clay wants to constrict around the pins.
@ScenterSquare13 күн бұрын
@@PotterybyKent I was thinking blowing canned air from the inside of the pot to just move the wet slip away from the pins before the clay shrinks away. Also wondered about the material you use to 3D print. Does that come in a spool? Would it be more consistently sized than the wax rods, and nonstick for the slip? Printing pins would be tedious, but might be splendid if the material works well. I’m a beeswax worker and would likely mold pins if the wax was the best option. Beeswax is durable and reusable. Alternatively, I use canned spray silicone on molds which would repel pretty much anything wet. Spraying your original metal pins should work well. One final thought on the metal pins is Plasti-Dip. There are both spray and dip options. It forms a long lasting chemical resistant plastic coating on tools, etc. it’s not expensive to try…
@PotterybyKent13 күн бұрын
Ah I see. The newly formed clay is still very wet so any focused air blast could easily and inadvertantly disrupt the pot. I did briefly think about spinning the mold to get the slip off but didn't have an easy way to try that. Silicone spray was discussed in the comments previously and the worry there is about coverage and the coating coming off. Printing a pin wouldn't work because of the texture of the print (I have a 3d printed funnel and there is some slip that sticks to it). And the filament itself is too small to use directly. I'm not sure if it is slippery enough or not to shed the slip.
@flyn-o13 күн бұрын
Standard 3D printer bowden tubes are 4mm OD PTFE, maybe you could find an appropriately sized screw (m2.5?) that would plug the hole and give it a head that would keep them from pulling through? Then put the printed outer mold for the plaster on to hold them in place rather than the tape?
@PotterybyKent13 күн бұрын
The problem would be whatever plug the tube isn't PTFE and that would likely retain the slip so kinda defeating the purpose. As far as pulling through, my previous attempts had a decent tolerance and friction was enough so I think that is the real solution there. And even if not, no the outer mold wouldn't work since that is flush with the plaster surface. Pulling the pins from the outside wouldn't work since there isn't anything to get a hold of just as I had issues here with the wax pins that ended up flush.
@malcolm743613 күн бұрын
This has been really interesting to watch you experiment! When you were trying to pull out the wax pins I thought that you could melt the end into a blob that would prevent the wax pin from going too far into the mould. Good luck with the further design :)
@PotterybyKent13 күн бұрын
Thanks! Yes I thought about that as well. However I'd need to get the tolerances correct first since some wanted to slide out and a blob on the end of the outside wouldn't help for them.
@theabristlebroom437813 күн бұрын
Kent, could you melt the wax and make custom pins to fit the holes that you can drill and make in the plaster?
@PotterybyKent13 күн бұрын
That is a good idea. I'd need to make some good molds but then I wouldn't have the tolerance issue I had here in that case. And I could make them any size I wanted.
@junafae14 күн бұрын
Would pulsing your drill, rather than going full pelt, stop the dreaded vortices?
@PotterybyKent14 күн бұрын
A larger volume of plaster is probably the biggest way to stop those
@mariakraatz218114 күн бұрын
Really useful video thanks Kent.
@PotterybyKent14 күн бұрын
Glad it was helpful!
@hannesaltenfelder430216 күн бұрын
I started with degassing the water first. Maybe it is because I used fresh tab water, but the amount of air(or chlorine?) that came out was enormous! I used my wife's toy for vibration and the best place to use it is the middle of the lid. At the walls it is much less effective. Now I'm waiting... will update soon. Update1: Wrong ratio🙄
@PotterybyKent16 күн бұрын
Interesting that your water alone was degassing! Not what I would have expected.
@hannesaltenfelder430215 күн бұрын
It seems like the water was boiling at room temperature because of the vacuum. I thought about that, but my misunderstanding was, that it would get warmer when boiling. But no, it is actually "cold boiling". kzfaq.infohr55yM6eAS0?si=v2l9kcJUbMIoGMvG
@PotterybyKent15 күн бұрын
Ah that does make sense. I think the same thing was happening to me. I want to try again controlling for pressure so that doesn't happen.
@mimamima-fr5yo17 күн бұрын
هل يمكنك ذكر المواد الخاصة بالالوان الخاص بالكؤوس وادوات المطبخ
@PotterybyKent17 күн бұрын
This one was colored using iron oxide and a few other oxides. But it was mixed from a few different slips I made so even I don't know exactly what the proportions were
@mimamima-fr5yo17 күн бұрын
هل يمكنك ان تذكر المواد المستعملة مع ذكر مقادير الخلط
@PotterybyKent17 күн бұрын
USG #1 Pottery plaster
@mimamima-fr5yo17 күн бұрын
انني ممتنة لك على مجهودك الجميل سيدي هل يمكنك ان تعطيني مقدار خلطة الجص من ماء وجص لكي اتأكد ان القالب لا يتكسر اتناء الاستعمال
@PotterybyKent17 күн бұрын
It's 70 parts plaster to 30 water
@chaosordeal29418 күн бұрын
I watched this with the sound off and I really don't know what the guy was doing. I mean, I get the clay and stuff, but not the goal. I'm not complaining -- I decided to turn the sound off and I enjoyed watching, despite having no idea. Just thought it was funny.
@PotterybyKent18 күн бұрын
Much of the story is indeed in my talking along what I'm doing and why I'm doing it
@DunoonVanRijn-dx1hr18 күн бұрын
It is the Frit that changes. The rest remains the same
@PotterybyKent18 күн бұрын
It is more than that for sure
@DunoonVanRijn-dx1hr19 күн бұрын
Beautiful
@PotterybyKent18 күн бұрын
Thank you
@DunoonVanRijn-dx1hr19 күн бұрын
Slip is authentic to pot making. Is not the poor man's glaze?
@PotterybyKent18 күн бұрын
Slip is clay - so ends up with a different surface finish than glaze
@musicrupert19 күн бұрын
why not leave the pins longer? its still runny when you take them out.... not sure if this was in another video or not
@PotterybyKent19 күн бұрын
It was one of the first things I tested, but it could be worth revisiting now that I am using the wax. The thought is by pulling them quickly, then the slip still has a chance to flow down and away. If I wait, any slip still on the pin will be deposited on the edge of the hole when I pull them out (which is what happened the first time I tried it). There is less clay on the waxed pins, but there still is some.
@cf_spacetime20 күн бұрын
What about pushing through than pulling out? So that the excess slip goes with the pin, than pulled back towards the hole and sticking? Only thing then is you need like a basket to collect all the pushed in pins at the end. This is entirely just a guess though.
@PotterybyKent20 күн бұрын
For a different form, I think that could work. But I can't pull them from the inside of my sphere form since I can't reach inside. If I pushed them and they fell inside they'd likely leave marks where they touch the very soft clay.
@marcelzwiers20 күн бұрын
Why not drill the holes after this step? Just by hand with the tiny 3mm drill. Now you know where the holes are, this will just take a minute.
@PotterybyKent20 күн бұрын
Because the clay breaks out as I showed near the beginning of the video. Locating the holes isn't the issue - it's the chipping.
@flyn-o20 күн бұрын
You might try 1/8" or 3mm PTFE (Teflon) plastic rod and see if you can skip the wax entirely while getting the same hydrophobic effect. Otherwise, rain-x applied to smooth nails, dowels, etc. could be worth trying as long as it wouldn't foul any of the nearby surfaces.
@PotterybyKent20 күн бұрын
A PTFE rod would seem like a great option! Thanks for the suggestion!
@alodin1120 күн бұрын
Will using silicone pins and/or hydrophobic spray used to impregnate textiles be helpful?
@PotterybyKent20 күн бұрын
In my last video, someone suggested silicone spray, which I do have. However I'm thinking it would have the same issue sticking to the pins. Silicone pins would be interesting - I wonder if I can find those.
@alodin1120 күн бұрын
Coating the nail with silicone designed for bathroom or kitchen use would likely be the easiest method to create silicone pins.
@cf_spacetime20 күн бұрын
@@alodin11 seen others 3d print silicone molds. Could just use the molds to make a set of multiple pins, but that would be $$$.
@PotterybyKent20 күн бұрын
Yes, I think if I were to go this route I'd need to make a mold and use a 2 part silicone. Otherwise I'm not sure I have the skill to make it smooth!
@debbiesandham20 күн бұрын
Thank you for posting your progress
@PotterybyKent20 күн бұрын
Thanks for following along!
@corwinmakes20 күн бұрын
It might be worth 3d printing some dowels instead of using metal pins. The textured surface of the printed dowels might allow for the wax to better adhere to them.
@PotterybyKent20 күн бұрын
That's an interesting thought. I guess it could also be modeled with extra texture if needed. My intuition is the final waxed surface should be smooth, but maybe if the wax is doing the right thing that wouldn't be needed?
@pedrobalduci775420 күн бұрын
i imagine that a wooden pin would work better due to water absorption
@PotterybyKent20 күн бұрын
Wood would like absorb the wax better. It would need to be fully coated though since if it absorbed water from the slip it would have the opposite effect than desired.
@JuliaMostowska22 күн бұрын
Today I am a ceramicist, but I used to work as a dental technician in a plastering plant. There are vacuum mixers for plaster, but they are certainly very expensive equipment and few prosthetic studios had them. It is important to sprinkle the plaster over all the water in smaller portions. Until you stir it, it doesn't start to set. it can stand there untouched for a few minutes. It then sinks and becomes easier to mix. When he gets involved, the bonding begins. I did it by hand, but with much smaller amounts of plaster... and I always poured it into the plaster using a prosthetic vibrator. It vibrates completely differently than yours. It has adjustable vibration intensity and a removable rubber on the counter for cleaning set plaster. I also always sprayed the model with an agent that removes surface tension, but this is probably mainly useful for complex forms with small details (like a tooth model). Thank you so much for sharing all your noledge. I hope to use it soon also❤
@PotterybyKent22 күн бұрын
Thanks for sharing all of the info!
@JMoDUB23 күн бұрын
Heres my idea, hear me out: 3D model the nails and make a mold that contains enough for a plaster-mold's worth. have them all attached to a central block. Print the mold in ABS/PETG. Pour liquid beeswax into the 3D printed mold (wax should release). Pull out the beeswax cast and then you have wax replicas of the nails. Cut from the molded block and insert into your plaster mold. Cast. Success. My guess is it will reduce the buildup on the inside, but not resolve the search for perfect internal holes; if there is such a thing.
@PotterybyKent23 күн бұрын
That is an interesting idea
@kennethelwell857426 күн бұрын
I like the idea of the wax plug through the mold wall. I think that you could push in the plugs from the outside so they would protrude farther than your wall thickness, and come time to de-mold, you could just push the plugs all the way through to the inside. It would be interesting to see the result of such a method on the inside surface... I wonder if the hydrophobia of the wax plug would create the opposite result as you found with the nails (a sink rather than a mound) The plugs could be solid wax, waxed candle wick, or some wood dowel soaked in molten wax. I'm not sure silicone spray wouldn't also soak into the adjacent plaster affecting its performance. There might be a source for wax rods for use in jewelry investment casting.
@PotterybyKent25 күн бұрын
Looking in the jewelry space for wax rods is an interesting thought!
@meggysuitiful26 күн бұрын
If your plastic container has a plastic label you can't remove , will that be an issue? It wouldn't seem so once the plastic was coated with wood soap.
@PotterybyKent25 күн бұрын
If it protrudes from the surface, even a tiny bit, then that would likely transfer into the plaster (and your pot). But as a way to get started I'm guessing it would be good enough.
@meggysuitiful25 күн бұрын
@@PotterybyKent The kind I refer to are sprayed on so appear to be part of the container. I'll give it a try! Thank you.