Johnmicheal Posted May 20, 2019 Report Share Posted May 20, 2019 I have been making a two quart open pitcher. I have not figured out how to make them pour, and they tend to drip down the side. Fortunately, most people want them for vases, but I like to have things functional, and would like them to pour. This is one of the first. I have tried a narrower spout, and a more pronounced lip, I haven't tried thinning the lip, mainly for durability. Also I've already changed the handle for better control and aesthetics. Any suggestions Link to comment Share on other sites More sharing options...
liambesaw Posted May 20, 2019 Report Share Posted May 20, 2019 It's hard when you keep a round edge like that. You can try scraping the glaze off after it's dried just on the spout, so when it fires its more of a sharp edge there that will cut the water off after a pour. Other than that I am not great at spouts myself but if I don't make a sharp edge on my spouts whether it's tea pots, sake jars or pitchers, they dribble pretty bad. Link to comment Share on other sites More sharing options...
Mark C. Posted May 20, 2019 Report Share Posted May 20, 2019 Pull more lip and make the edge thinner.Its always a trade off. Link to comment Share on other sites More sharing options...
Babs Posted May 20, 2019 Report Share Posted May 20, 2019 photo of actual spout from side be good as the angle of the pouring edge is important imo. check out a few pitchers which you know work dripless Link to comment Share on other sites More sharing options...
neilestrick Posted May 20, 2019 Report Share Posted May 20, 2019 You need a sharp edge on the spout. When you make the spout, first pull it up to thin it out, then shape it. Link to comment Share on other sites More sharing options...
Johnmicheal Posted May 20, 2019 Author Report Share Posted May 20, 2019 It looks like thinner is the direction I will go, thanks guys, I'll let you know how it goes. Link to comment Share on other sites More sharing options...
Pres Posted May 20, 2019 Report Share Posted May 20, 2019 Your rounded rim is not so much a problem, but the entire spout set up is. There are a few steps you can take to make it work better: start the throat of the pitcher about a third of the way down the form. use the thumb and curved forefinger to shape the spout once the shape you have presently by pulling upwards with the thumb inside the spout and the curved forefinger outside, use lots of water and pull so that the spout rises and things slightly. . not so thin as to become weak, just enough to shape and thin the rim. Lastly on the spout use a damp finger on the inside of the spout rubbing back and forth to slightly widen the spout where at the rim. Last step is to use the finger around the untouched rim to move it slightly lower than the area of the spout, this I usually do on the wheel with the wheel speed slow, first finger inside hooked over the top . Hope my description is helpful, best, Pres Link to comment Share on other sites More sharing options...
Bill Kielb Posted May 20, 2019 Report Share Posted May 20, 2019 Just needs to have a sharp edge. Often easiest to do after bisque as the clay can be block sanded to create a very uniform sharp transition at the front edge. Less surface attachment better chance for gravity to rip it away cleanly. Interesting point, next time you are at a shopping center look up at the ceiling of most canopies (Stucco type). It’s common to place a V groove a few inches in from the edge so as the water rolls around the canopy edge to the canopy ceiling it has to go back uphill into the V groove. This gives gravity time to do its work. Worst case, pitchers could sport the same groove just under the trailing edge of the spout but in the end some liquid would roll down the pitcher. It would only be a fail safe against extended pouring dribbles. Basically anything you do to make this pouring angle more acute and sharp gives gravity an advantage for a clean separation. Link to comment Share on other sites More sharing options...
Bill Kielb Posted May 20, 2019 Report Share Posted May 20, 2019 3 hours ago, neilestrick said: You need a sharp edge on the spout. When you make the spout, first pull it up to thin it out, then shape it. Forward cant of this spout helps gravity pull this down and away for most all pouring conditions. Nice design! Link to comment Share on other sites More sharing options...
Magnolia Mud Research Posted May 20, 2019 Report Share Posted May 20, 2019 You might find some insights to the physics of the tea-pot dribbling phenomena by reading the recently published article (and all of the articles cited therein): I'm a little teapot — Dribble no more: Physics can help combat that pesky “teapot effect” Dutch scientists devised a model to predict flow rate when dribbling will occur.Jennifer Ouellette - 5/17/2019, 5:45 AMhttps://arstechnica.com/science/2019/05/dribble-no-more-physics-can-help-combat-that-pesky-teapot-effect/ LT Link to comment Share on other sites More sharing options...
Johnmicheal Posted May 21, 2019 Author Report Share Posted May 21, 2019 7 hours ago, Magnolia Mud Research said: You might find some insights to the physics of the tea-pot dribbling phenomena by reading the recently published article (and all of the articles cited therein): I'm a little teapot — Dribble no more: Physics can help combat that pesky “teapot effect” Dutch scientists devised a model to predict flow rate when dribbling will occur.Jennifer Ouellette - 5/17/2019, 5:45 AMhttps://arstechnica.com/science/2019/05/dribble-no-more-physics-can-help-combat-that-pesky-teapot-effect/ LT Funny you should mention this article, I just read it recently and it prompted me to post this query. Link to comment Share on other sites More sharing options...
Bill Kielb Posted May 21, 2019 Report Share Posted May 21, 2019 4 minutes ago, Johnmicheal said: Funny you should mention this article, I just read it recently and it prompted me to post this query. Teapots definitely more involved. Suggested viewing for some more insight and general pleasure: smarter everyday - laminar flow. (You tube) free education and super high speed camera. Sometimes seeing is great for analysis. Link to comment Share on other sites More sharing options...
Hulk Posted May 21, 2019 Report Share Posted May 21, 2019 I'm very much still in the figurin' phase on closed/tubular spouts and, particularly, open/pitcher type spouts - read somewhere an article that mentions Peterson and Casson ...aha! Hesselberth's, here https://www.claytimes.com/articles/spouts.html Link to comment Share on other sites More sharing options...
Johnmicheal Posted May 22, 2019 Author Report Share Posted May 22, 2019 Third try, I'll see how it pours when it's done, lol Link to comment Share on other sites More sharing options...
Min Posted May 22, 2019 Report Share Posted May 22, 2019 Try thinning that lip out, you want a sharp edge there to cut the flow so it doesn't dribble. On the next one try giving it a throat, see how on Neil's pitcher there is room for a swell of liquid on the approach to the lip. It could also be wider at the throat on the next one. You could make a practice pitcher, make the same shape cylinder then instead of putting a handle on it pull 4 spouts going around the edge then see which design pours the best. Link to comment Share on other sites More sharing options...
Magnolia Mud Research Posted May 22, 2019 Report Share Posted May 22, 2019 The 'sharp edge' needs to be at the edge where the liquid separates from the spout. The photographs show the edge to be rounded. The shape and thickness otherwise appears to be OK. Bill mentioned in an earlier post that he "files" the lip at the bisque stage. It might be useful to bisque one of the pitchers and use it as a prototype by pouring water from the pitcher and filing the edge away, and pouring, etc. until you find the right amount of "sharpness" of the edge. I once made a deep bowl with a big bunch of spouts around the rim, each different in sharpness and thickness. Then after it was fired I could pour from each of them and begin to get some real data on what works and what does not work. LT Link to comment Share on other sites More sharing options...
Johnmicheal Posted May 22, 2019 Author Report Share Posted May 22, 2019 11 minutes ago, Magnolia Mud Research said: The 'sharp edge' needs to be at the edge where the liquid separates from the spout. The photographs show the edge to be rounded. The shape and thickness otherwise appears to be OK. Bill mentioned in an earlier post that he "files" the lip at the bisque stage. It might be useful to bisque one of the pitchers and use it as a prototype by pouring water from the pitcher and filing the edge away, and pouring, etc. until you find the right amount of "sharpness" of the edge. I once made a deep bowl with a big bunch of spouts around the rim, each different in sharpness and thickness. Then after it was fired I could pour from each of them and begin to get some real data on what works and what does not work. LT I love the bowl idea, and I am going file them at the bisque stage, I've got four to mess with. Link to comment Share on other sites More sharing options...
Mark C. Posted May 22, 2019 Report Share Posted May 22, 2019 Spout day this am.The sun is out and pots dry well in that warmth. Its been raining here for days Pulled them on large and small pitchers- and 48 spoonrests -all porcelain Handles later today Link to comment Share on other sites More sharing options...
liambesaw Posted May 22, 2019 Report Share Posted May 22, 2019 Can I come work and live with you? What a dream. Everything looks so nice, wish I could learn from a master Link to comment Share on other sites More sharing options...
Mark C. Posted May 22, 2019 Report Share Posted May 22, 2019 1 hour ago, liambesaw said: Can I come work and live with you? What a dream. Everything looks so nice, wish I could learn from a master careful what you wish for. Leave the dog and wife for clay dreams that ends with bad back and broken body parts Link to comment Share on other sites More sharing options...
liambesaw Posted May 22, 2019 Report Share Posted May 22, 2019 1 minute ago, Mark C. said: careful what you wish for. Leave the dog and wife for clay dreams that ends with bad back and broken body parts Link to comment Share on other sites More sharing options...
Bill Kielb Posted May 23, 2019 Report Share Posted May 23, 2019 On 5/22/2019 at 12:33 PM, Johnmicheal said: Third try, I'll see how it pours when it's done, lol This might help as a picture is worth a thousand words. So in addition to the edge that the fluid has to pour over or trailing edge being sharp and not rounded, the tilt of the spout can help. So if we use Neil’s pitcher (thanks Neil), notice the forward lean of the spout. Kind of counterintuitive but we know gravity always pulls things straight down, so a tilting picture of a pitcher is in order. The yellow line is the default spout angle and the red arrow is the pull of gravity. As the pitcher is poured gravity can help pull the liquid away from the dribble zone as long as the spout has this counterintuitive tilt. Add a sharp trailing edge and voila easier job for gravity. Now depending on the shape and size, time to experiment with a piece of string with a weight on it. Just figure the amount of tilt for typical fill level and ya got an easy visual. Also can help determine what is the best angle to block sand your bisque product based on visualized fill levels and your handy gravity indicator (weighted string) hope that sparks some thought! Now as to laminar flow, Reynolds numbers, etc.... for another day. Let’s just say Smooth flow terminates much more cleanly than turbulent flow. Smooth, gentle with reasonable velocity , basically good, rough turbulent basically bad. Link to comment Share on other sites More sharing options...
liambesaw Posted May 23, 2019 Report Share Posted May 23, 2019 You're making me dizzy, bill Link to comment Share on other sites More sharing options...
Bill Kielb Posted May 23, 2019 Report Share Posted May 23, 2019 I am naturally dizzy, sorry! Use the string and weight, you will figure it out. Took a lot of effort just to get those up there Link to comment Share on other sites More sharing options...
Pres Posted May 23, 2019 Report Share Posted May 23, 2019 18 hours ago, Mark C. said: careful what you wish for. Leave the dog and wife for clay dreams that ends with bad back and broken body parts Don't forget the arthritic joints in hand, elbows and wrists! best, Pres Link to comment Share on other sites More sharing options...
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