Cutting dados for plywood thicknesses

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Forum topic by jstewart posted 08-26-2007 12:37 AM 2020 views 1 time favorited 8 replies Add to Favorites Watch
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141 posts in 5588 days

08-26-2007 12:37 AM

Topic tags/keywords: dado blade plywood

I’m in the market for an 8” dado set. I’ve noticed that some blades tout their ability to cut plywood thicknesses (such as 23/32” for 3/4” plywood). For example, the Freud SD 508 has a 3/32” chipper that allows for this use. However, the Freud SD 208 is adjustable by 1/16” increments. Does that mean I won’t be able to get tight dados for working with 3/4” plywood?

-- Joshua, Olathe, Kansas

8 replies so far

View Bill's profile


2579 posts in 5658 days

#1 posted 08-26-2007 01:05 AM

Well not all 3/4” plywood is actually 3/4. Sometimes it is a bit smaller. Also, if you look some of the other types of plywood are like 23/32, etc. A slight difference, but it could make your dado not fit well if you cut it for 3/4”.

With all the adjustments in there, I would think you should be able to match up your plywood with the dado.

-- Bill, Turlock California,

View jstewart's profile


141 posts in 5588 days

#2 posted 08-26-2007 01:11 AM

Right. That’s why I was asking. What I should have asked… Do the shims in a dado set allow for enough adjustment to be able to make a 23/32” cut? Or do I need to buy a dado set that has allows for 1/32” adjustments?

-- Joshua, Olathe, Kansas

View Karson's profile


35301 posts in 5897 days

#3 posted 08-26-2007 03:05 AM


How’s the baby doing.

The dado sets should be able to do nominal sizes. 3/4” would be normal lumber sizes.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Appomattox Virginia [email protected]

View jstewart's profile


141 posts in 5588 days

#4 posted 08-26-2007 03:49 AM

The baby is great. She’s slowing down my progress on all sorts of household tasks, including my woodworking.

-- Joshua, Olathe, Kansas

View mot's profile


4928 posts in 5533 days

#5 posted 08-26-2007 07:31 AM

In my experience with dado sets, you can never have too many sizes of shims. I typically take a digital caliper, measure the plywood, then measure the stack, add shims, remeasure the stack, make a test cut and adjust from there. The process takes a few minutes. You can make a router jig to do the same thing and have it take marginally less time to use the stack and shims. I have the 508 and use some Lee Valley Shims with it just because I’m more intimate with their actual sizes….and, “What karson said.”

-- You can discover more about a person in an hour of play than in a year of conversation. (Plato)

View WayneC's profile


14359 posts in 5594 days

#6 posted 08-26-2007 08:40 PM

I also have the SD508. Here is a link to the shims tom is referring too. Figured I would add them to the post since I went and looked them. Think I will be buying a set. They are $7.75 US.,41080,41165

-- We must guard our enthusiasm as we would our life - James Krenov

View Dick, & Barb Cain's profile

Dick, & Barb Cain

8693 posts in 5796 days

#7 posted 08-26-2007 11:23 PM

You can go the cheap way, & cut some out of paper, or cardboard.

This comes from being a depression baby! LOL

-- -** You are never to old to set another goal or to dream a new dream ****************** Dick, & Barb Cain, Hibbing, MN.

View Sawdust2's profile


1466 posts in 5584 days

#8 posted 08-27-2007 03:52 AM

If dollar bill is 1/128th of an inch it would take a few bucks to make 1/32nd.
Oh, yes. Paper, not dollar bills.
Buy the shims.

-- No piece is cut too short. It was meant for a smaller project.

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