Turning a Live Edge Bowl
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- Опубліковано 29 вер 2024
- Have you ever wondered how to preserve the bark on live-edge stock? Normally, bark dries and shrinks faster than the wood to which it's attached. This stresses the bond between the two and the bark sloughs off. But as this video begins, Nick has been soaking a slice of a walnut log in polyethylene glycol -- PEG -- for four months. The PEG has stabilized both the wood and the bark; neither has shrunk; so the bond between them remains strong. He turns a bowl the same diameter as the log, leaving a ring of bark all around the circumference. Not only does the bark remain attached, it is hard enough to be turned just like the wood.
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#lathe #turning #live #edge #bark #bowl #PEG #polyethylene #glycol #faceplate #woodworking #howto
Here's another was to use polyethylene glycol (PEG). As I explained for a previous video, PEG is a waxy substance that will stabilize green wood, allowing you to turn it or work it before you season it. Usually the acronym PEG is followed by a number, such as PEG-1000 or PEG-3350. These refer to molecular weights. A smaller molecular weight works best for wood stabilization; it’s easier for the smaller molecules to diffuse throughout the wood. Higher weights are often used as laxatives.
PEG dissolves readily in warm water; its melting point is 104⁰F (40⁰C). When you soak green wood - wood with moisture content above 19% - in a highly concentrated solution (30% to 50%) of PEG, the chemical slowly diffuses through the wood, replacing the bound water in the cell walls. This has the effect of stabilizing the wood, reducing the amount it will shrink and expand. The wood will still absorb and release water as the relative humidity changes - PEG is actually more hygroscopic than wood - but the wood won’t move as much.
There are two ways you can use PEG as a stabilizer. You can soak it just long enough (3 to 7 days) to create a chemical shell around the turned piece. This encapsulates the remaining bound water, forcing it to evaporate drop by tiny drop. The wood still shrinks, but it shrinks slowly and uniformly with very few checks and splits. Or you can soak the green wood in the solution for several months until all the bound water is replaced completely. This can reduce wood movement by as much as 80% in some species. This is the method I used in this video.
I've never done this before on a bark-included turning and I wanted to see what difference it would make. The bark seemed to be much more substantial than it has been on turnings that I have soaked only for a few days. I was able to turn both bark and wood without being overly careful or having to constantly adjust the cutting angle and pressure. However, I did find it more difficult to sand -- the waxy dust loaded onto the sandpaper very quickly, as you can tell at 01:55 and 04:18.
The concentration of the PEG solution was about 40% - 10 pounds (4.53 kilograms) of PEG-1000 to 3 gallons (11.36 liters) of water. I finished the bowl with a mixture of tung oil and spar urethane, mixed 8 parts tung oil to 1 part urethane. This is similar to "antique oil." PEG-impregnated wood will accept most wiping finishes and a few types of polyurethane, but not much else. I suggest you test your finish on a PEG-soaked scrap before risking it on a completed turning. PEG, by the way, is food-safe.
If you google "PEG-1000 for sale," you'll find several sources for small-molecular-weight polyethylene glycol. This is the one I use: www.rockler.com/polyethylene-glycol-peg-green-wood-stabilizer?country=US&sid=V91040&promo=shopping&PL&gclid=CjwKCAjwp_GJBhBmEiwALWBQkwXS30IOoDnoCOoF1RSC949zPkmlWHVeUXffyZdbMcA7cS1gLnSllBoCbx0QAvD_BwE
All the information (that isn't easy to come by) synthesized in one comment! Thank you very much, sir!
@@lindemann316 Most welcome.
@@lindemann316 It isn't easy to come by, is it? It took some intensive research of pull that together. I appreciate you saying so.
Good! We miss you on the Shopsmith forums!
You are full of knowledge. Thank you for making videos and sharing with the world. God bless you!!
I can only assume that many years ago a wood turner sent a letter the inventor of PEG which contained a typo, "Will PEG work on my bowels." The inventor sent back a simple reply, "Yes." And fake history was made.
Nice work, but voice-over would have been helpful.
I agree wholeheartedly, but we produce a small number of wordless time-lapse videos to help build our international audience. These are by design more entertaining than informative. Rest assured that if there is sufficient interest in this project, Travis and I will follow up with an extended how-to lecture so thoroughly educational as to render my entire English-speaking audience catatonic.
What a beautiful piece and a calming video to watch while laid up with a bad back and, never having heard of PEG before, tonight is another night when I’ll go to bed less stupid 🌞
AsI told you before, that is one of the all time great maxims. It ought to be a rallying cry for all of humanity. Get better; your tools miss you.
Nice, as always. The Shopsmith makes me miss my father-in law.
watching a lathe at work is magical. I miss my old woodshop
The live edge would make it tough to drink your cereal milk or soup, but gosh dang it's beautiful.
Thanks.
40 years ago I saw a full sized wooden pig in fancy living room. The log must have been treated with PEG. There were no cracks like the cover of Hoadley's book UNDERSTANDING WOOD.
yoo this guy didn't just find the center, he found the center of mass
Thanks for noticing -- this is an important safety issue. Friend of mine once mounted a small log on his Shopsmith lathe, using the centers instead of the center of mass. When he turned it on, the whole tool began to bounce. He had to trip the circuit breaker to stop it; it would have been too dangerous to try to catch the switch.
End grain is a pain
Great video I always wondered how they do that. What kind of turning saw is that ? I would love to see you guys make one with your usual swist on things.
The "turning saw" or lathe is a Shopsmith, Specifically, and old "brownie" Shopsmith combination tool (saw, sander, drill press, boring machine, lathe) made in the 1960s, then recently updated with a digital DVR motor and a larger saw table.
@@WorkshopCompanion sorry not the shopsmith i was asking about the hand bow saw aka turning saw. It has a blade that can turn in the cut. Like a hand scroll saw.
@@blacknorce It's called a frame saw. Also known as a buck saw. Easy to make.
Nice work Nick. Really nice to see you turning on the Shopsmith I have never seen anyone turn on it. Thanks d
You're most welcome. Be sure to read my comment to The Buckeye Wood Shop. And if you'd like to see more turning on a Shopsmith, see ua-cam.com/video/9g_7-9LRNEE/v-deo.html
That’s all I use is our SS Mark V. I turn all kinds of things from large to small. 👍mm
I've never seen a lathe where the headstock moves like that; its usually the tailstock that drives into the workpiece. What's the finish added after turning, more PEG? I find I get a better cut when the tool rest is slightly lower than the center line, but maybe it's just the camera angle. Anyway, really enjoying your videos!
The lathe is a Shopsmith Mark V; the finish is polymerized tung oil (food-contact safe). Most oil-based wipe-on finishes will dry over PEG. Thanks for sharing.
I too have a ShopSmith and turn frequently, I usually turn pens, but a few bowls and bracelets.
We're getting ready to do some pens, John. Have a few interest designs.
I've got some PEG-3350, aka Miralax, in my medicine cabinet, but I don't think it's enough for a project like this :)
Beautiful work by the way!
Thank you. And no, that's not enough PEG -- you'll need about 10 pounds. And the stuff they use as a laxative has a molecular weight way too high for effective wood stabilization. I use this stuff: www.rockler.com/polyethylene-glycol-peg-green-wood-stabilizer?country=US&sid=V91040&promo=shopping&PL&gclid=CjwKCAjwp_GJBhBmEiwALWBQkwXS30IOoDnoCOoF1RSC949zPkmlWHVeUXffyZdbMcA7cS1gLnSllBoCbx0QAvD_BwE
Х... ня.
Sei un grande Maestro e da molto che ti seguo per le tue eccellenti realizzazioni, complimenti un grande saluto 😊👍
Ciao a te e grazie per le tue belle parole.
Nice bowl Orv!
Thanks, Chad.
@@WorkshopCompanion Those weren't any of my chisels in the video, were they?