wood expansion chart
Enter now for your chance to win more than $2,000 worth of woodworking equipment from Woodpeckers. Check out the woodshopwidget.com. Chris Schwarz has worked out of his tool chests for decades, and finds them to be the perfect combination of protection, access, and flexibility. startxref 0000001272 00000 n Clearance hole chart for inch bolts and screws according to ASME B18.2.8 Thermal Expansion Coefficient 3–21 Electrical Properties 3–21 Conductivity 3–21 Dielectric Constant 3–22 Dielectric Power Factor 3–22 ... wood, it is impossible to give detailed color descriptions of the various kinds of wood. Panel has expanded and broken the corner joint of door. Related Documents . Tabletops tend to be wide, and wood moves a lot across its width. Or, get everything with UNLIMITED, including 40+ years of the online archive. You can be sure I’ll be putting these simple techniques to use as I size door panels and drawer parts. I think your idea of expansion joints is really good, but no matter how well you pre-finish the material, it's still going to acclimate to the humidity in the house eventually. In addition to being hygroscopic (gaining or losing moisture from the surrounding air), wood is also anisotropic. Still the averages can be applied to most practical situations. Now to the science. Don't forget to add a "foo factor" for good m Notes: T = Tangential Movement - use for Flat Sawn Wood R = Radial Movement - use for Quartersawn Wood Initial Moisture Content: Enter the initial moisture content(MC). Should be even easier now than "way back when" the article was first published. I've been thinking of doing it since then but have not. I consulted Chris’ article titled Stop Guessing at Wood Movement from issue #187. UNLIMITED membership - Get access to it all. Related Topics . This was the first time that my efforts at “guesstimating” a panel size for seasonal changes resulted in a failure and I don’t want a repeat of the event. For instance, in a forced air heated house, winter humidity may be lower than during the summer when the furnace is shut down and the interior humidity is more akin to the exterior humidity. This autumn I’ll be constructing a rather large white oak built-in at my home. The values are expressed as a percentage of the green dimension for radial, tangential, and tangential to radial (T/R) shrinkage. Humidity varies from 5% in the dry season and 95+% in the monsoons? Sapwood of most species is light in … 0000006807 00000 n the finish will be oil and it will be outside with no shade If 10 is the variance, what about the 8? Oh, and someone asked about the "schmootz" on the clear plastic window of the meter's needle assembly. unfinished wood by door stiles. %%EOF Tool News: Wagner Meters Brings New Orion® Pinless Wood Moisture Meters to AWFS 2019, Shop Talk Live 36: Definitely a Dovetail Disaster, Complete Illustrated Guide to Woodworking USB, From the Editor: Publishing during a pandemic, Save 56% off the magazine newsstand price. Anyhow, I'm glad I decided to veer towards using a touch of science in my woodworking. If you get your timing wrong will you end up with too much play or too little? Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more ; Density - Density of different solid materials, liquids and gases. Methods for Dealing With Expansion and Shrinkage . Subtract the differences in original and oven dry weight and divide that amount by the oven dry weight. where did the 8 and 10 come from? With segmented turning, the size, design, and wood selection are limited only by your imagination, skill, and patience. A wood shrinkage and expansion calculator The Shrinkulator helps you estimate dimensional changes in wood, either shrinkage or expansion, based on changes in the wood’s moisture content. Do use tabletop fasteners. 0000004413 00000 n I'm now concerned about width vs length movement. Not sure if that helps you. Where you write, "IE: [.0037 x 8 x 10] = .296-in". I hope you and other readers find it useful. The next number we need to know is a worst-case scenario moisture content (who knows where my furniture might end up in the future!). LET TABLETOPS FLOAT. In the chart shown to the right the higher the number the more susceptible each species will be in relation to movement. 0000002161 00000 n If the 1/16-in. It's not that big of a piece, but it packs in a…, Chris Gochnour's sideboard combines usefulness, strength, and beauty in a contemporary case piece. In fact, I’ve taken it upon myself to dub this the Ultimate Solution for Wood Movement. It’s used for pallets, crates, upholstered furniture frames, paper (pulpwood), and plywood. Become an UNLIMITED member and get it all: searchable online archive of every issue, how-to videos, Complete Illustrated Guide to Woodworking digital series, print magazine, e-newsletter, and more. Definitions and convertion calculators. CLEARANCE HOLE CHART. Gaps were 1/16", and stayed that way regardless of the humidity changes, and I live in Massachusetts and don't have air conditioning. Sustainability: This wood species is not listed in the CITES Appendices or on the IUCN Red List of Threatened Species. The differences are 2% winter & 3% The math is as follows: 6 x 2 = 12 or ~12/64" or 3/16" shrinkage & 9 x 2 = 18" or ~18/64 or ~9/32" growth. This simple chart ought to be enough to get you started with regards to calculating movement for a variety of the most common wood species encountered by craftsmen here in North America. 0000003911 00000 n The formula and abbreviated chart are adapted from the Wood Handbook, published by the U.S. Department of Agriculture, Forest Products Laboratory. For far too long now, I’ve gone about building my furniture and using what amounts to voodoo science and guesswork to account for seasonal changes in humidity that cause captured panels (be they drawer bottoms, inset drawer fronts, or cabinet backs) to swell or shrink depending on the season. OK, all these suggestion and calculations are well and good but what if the furniture you are building is for the South West IE, Phoenix, Arizona. Family Handyman One of the most common errors that beginning woodworkers make is to securely fasten wood tabletops to the underlying frame. 4. So an item slated to go from Connecticut to Louisiana or sub-Saharan Africa will more than likely reside in an air conditioned space. 0 It just seems to me that this would yield a much more accurate reading. It is not possible to predict accurately the movement of a single piece of wood. Never again will I invest hours upon hours in a project, only to find it “busted into oblivion” by the time summer arrives! IE: [.0037 x 8 x 10] = .296-in., which is roughly 5/16-in. My basement has more moisture than the living spaces above. Now we multiply those three values together. To give solid wood pieces plenty of opportunity for wood expansion, here’s a list of things you should and shouldn’t do: Don’t glue a solid wood top to the rails in the base. 0000004894 00000 n In this case, width would be height of the bench, nothing to worry about. Known for efficiency in his work, Mike Pekovich has built a few iterations of his sled for making mitered boxes. One of those 10%'s needs to be 6%, but you know that. For a typical project, how much movement variation should I expect because my meter is inaccurate by 1%? Wood that expands and contracts due to changes in moisture content will do so along predictable lines. It really doesn't look offensive and the reasoning makes sense. Just imagine a gap of more than 1/8" top and bottom of the drawer.better to use realistic moisture differences, not worst case. Common Uses: Seldom used for its appearance, (except in the case of Rainbow Poplar), Poplar is a utility wood in nearly every sense. Moisture being released from or absorbed by the wood is what creates the movement. The success of a woodworking venture partly depends on upon whether or not allowance has been made for wood expansion and shrinkage. If the sheets had their grain all in the same direction, it would essentially be just one solid piece of wood, and expansion/contraction would be an issue again. Just how do I plan to incorporate a moisture meter into my woodworking? I use it a lot but I approximate starting and final moisture based on my city. If it is actually going to be in a very high humidity region that does not mean it will be absent any climate control. That said, those of you who worry about 1/8-in. 0000000972 00000 n It offers many advantages over the tube-dispensed gooey stuff that has been about the only option available for years. Allowing for Wood Expansion in Solid Board Paneling ... MC. 0000005841 00000 n I'll be measuring that moisture change from month-to-month throughout a 12 month cycle to see what my specific conditions are like here in New England. I think I need to find a moisture meter too. I'm really geeking out with this thing. It's some sort of glue that was used to, well, glue something to the window at some point--sort of "rubbery" in nature. 0000001688 00000 n In addition to Garage Woodworks, there's also an app for your iPhone/Android called Woodshop Widget and available here: http://woodshopwidget.com/. What this means is that wood has different properties depending on the direction or orientation of the grainits not the same in all directionsand one of the areas where this property is most clearly seen is in dimensional shrinkage.
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