5 Sep
2009
5 Sep
'09
9:04 a.m.
At 08:36 AM 9/5/2009 -0500, you wrote:
On Sat, Sep 5, 2009 at 12:25 AM, Chuck Guzis<cclist
at sydex.com> wrote:
I have several router bits and dado heads that are sold as being for
half-inch plywood, but they cut a smaller slot, so that the plywood fits
properly in the slot.
Wikipedia:
For convenience, we refer to lumber by its nominal dimensions, which are
larger than its actual fractional size (see above table). This difference
occurs because nominal dimensions traditionally referred to rough lumber,
whose size was reduced in drying and planing. In addition, the standard
finished dimensions of lumber have decreased through time?the typical 13/16
inches for a 1-inch board in the 1910s was reduced by 4% in 1929 and by
another 4% in 1956, resulting in the current standard of 3/4 inch.[2] The
move to set national standards for lumber in the United States began with
publication of the American Lumber Standard in 1924, which set
specifications for lumber dimensions, grade, and moisture content; it also
developed inspection and accreditation programs. These standards have
changed over the years to meet the changing needs of consumers,
manufacturers, and distributors, so that lumber would remain competitive
with alternative construction products. Current standards are set by the
American Lumber Standard Committee, appointed by the Secretary of Commerce.[3]
That's been the rage for a few years with
consumer upright vacs,
particularly with the Dysons. The problem of course is that the
final filter is usually fairly expensive and slowly clogs during
operation. I've had a couple of the cyclonic ones and went back to a
double-layer disposable bag. I figure it runs about the same amount
of money for the same performance and I get like-new performance
every time I dump the bag.
Dysons are all we use. The problem for us is that we have 9 kids who
> And a 1x2 isn't 1" x 2". It's been that way forever. The
plywood
> I've purchased over the last 3 decades have all called out the actual
> finished sanded thickness. Is unsanded CDX the actual "nominal"
> thickness? I think so. 2-by is different. That nominal dimension is what the
2x4 was before
planing (or so the theory goes), so after it's been planed and
smoothed, a separate service, it's slightly smaller.
I'm not sure about CDX, although I would assume that it's too thin
also. But 3/4" birch or oak plywood that you could use in a nice
furniture project is definitely not 3/4" anymore. It's the nominal
thing.
I agree. The veneers are practically paper. I've sort of sworn off
plywood for furniture projects, except as maybe an interior second
wood. It splinters and chips out when you machine it. And you have
to hide the edge. Then there's voids. And you can't even count on it
staying flat these days. Gluing up panels from real wood is the way
to go.
Especially if you have unlimited funds :-)
-----
681. [Confession] A man's very highest moment is, I have no doubt at all, when
he kneels in the dust, and beats his breast, and tells all the sins of his
life. --Oscar Wilde
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