Woodworker's Journal 2008-32-2, страница 18
QUESTIONS A \ V fV THIS ISSUE'S EXPERTS SI recently had the good fortune of obtaining a nice supply of various hardwood cutoffs and am puzzled by the colors painted on the board ends, such as red, blue, green, black and orange. I am sure they are a code to identify the wood species. Is there a source of information that explains the code, as I sometimes have a bit of a problem distinguishing red from white oak, birch from maple, etc.? It would be a great help in determining how to work with each type of wood. Tony Leto Springdale, Arkansas Does it make a difference on strength I cut a long thin strip of plywood with the grain or cross grain? I know it makes a difference on hardwood. Amy Nielsen Maple Valley, Washington 3 when I've read numerous reports on spraying and evaluations of sprayers, Chromatically Corporate Lumber Richard Jones is the owner of a 100-year-old, family-run hardwood dealership. Chris Marshall is the author of several books on woodworking, table saws and router use. He is also Woodworker's Journal's field editor. Michael Dresdner is a nationally known finishing expert and author o/The New Wood Finishing Book from Taunton Press. Contact us by writing to "Q&A," Woodworker's Journal, 4385 Willow Drive, Medina, MN 55340, faxjng us at (763) 473-8396 or by e-mailing us at: QandA@woodworkersjournal.com Please include your home address, phone number and e-mail address (i! you have one) with your question. This helps a mill identify its production once it goes out into the marketplace. A one-color choice is also more efficient than the multiple colors needed if each specie had its own color. Imported wood from countries other than the U.S. is slightly different. While South American woods will also have mill-specific colored end coating, the material may be further spot painted or stripped over the original end coating to indicate port of shipment. One way to upgrade your abilities in wood identification is to purchase the Woods of The World CD-Rom, which is available at rockler.com. — Richard 0. Jones II This is a good question Si, and one that I have not heard before. It would be nice if our industry was coordinated enough to color code by species; unfortunately, this is not the case. The end coating used on lumber was originally used to seal the ends of fresh cut lumber before being put on sticks for air drying prior to kiln drying. This reduced the chance for splits during the air drying process due to lumber drying at a faster rate on end cuts than on the surface. Today, with pre-dryers, this is less of a reason for end coating, although it is still done. Usually a mill or vendor chooses a corporate color and endcoats all the species it produces with that color. si You probably already 1,1 know that ply layers in a sheet of plywood alternate. The crisscross pattern lends good strength both along and across the sheet, so cutting a thin strip lengthwise or widthwise shouldn't really matter much. Of course, the longer and narrower the strip, the weaker it will be either way. When the sheet has an odd number of plys, I find that there's slightly more strength cutting the strip along the dimension of the sheet that has the greater number of plys facing the same way. — Chris Marshall Continued on page 20 ... A recall is in effect involving model number 90206 Performax and model number 34570 Wilton 10" sliding miter saws with date code/serial numbers ranging from W062505 to W070405. The saw's handle switch can fail, causing the saw to smoke, spark and trip circuit breakers, and disable the safety brake. The saw can also keep operating unless the unit is unplugged, posing a laceration hazard. For more information, visit www.wmhtoolgroup.com or call 800-689-9928. 18 April 2008 Woodworker's Journal |
