On 1/16/2010 2:48 PM, Gordon Shumway wrote:
On Sat, 16 Jan 2010 14:34:13 -0600, wrote:

On 1/16/2010 2:14 PM, Gordon Shumway wrote:
On Sat, 16 Jan 2010 12:26:35 -0600, wrote:

Plywood is not 3/4" thick, and yes, there are bits that are sized for
the thickness of modern plywood, generally around 23/32 for 3/4" plywood.

Assuming the OP is not using cabinet grade plywood you are correct.
However, if the project does involve cabinet grade plywood then a 3/4"
piece of plywood is 3/4" thick.


Actually, there is no "grade" of plywood termed "cabinet grade".

Touché.

I buy a _lot_ of plywood.

As an example, the last 3/4" "hardwood plywood" I bought for a large
kitchen project was "A-1 grade" Red Oak and was just a tad over 23/32"
thick (.73) ... on a good day.

Since hardwood ply varies in thickness from lot to lot, even from the
same manufacturer, I try to buy plywood for a full sized kitchen all at
one time, and from the same stack, so that I can at least try to get an
even average thickness.

AAMOF, and Leon will verify this, I ALWAYS carry a "project dado guide"
in my truck for the projects that are currently in progress ... this is
nothing more than cutoff stile with the project dado size cut in it that
matched the thickness of the first lot of plywood bought for that
particular project:

http://www.e-woodshop.net/files/projectdado.jpg

That way, and because I make all the face frames first, I can insure
that any extra plywood that needs to be bought, from a different lot,
stack, or retailer, will actually fit the pre-cut dadoes in the face
frames already made up.

I do wish that this thickness variable wasn't in play, but it must be
taken into account when doing any production type fabrication.

--
www.e-woodshop.net
Last update: 10/22/08
KarlC@ (the obvious)