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Forum topic by mIps posted 08-11-2014 07:49 PM 1040 views 0 times favorited 11 replies Add to Favorites Watch
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mIps

187 posts in 1521 days


08-11-2014 07:49 PM

Topic tags/keywords: question router

I need to make some dadoes in plywood for a shop project. The piece of wood is too large to safely handle on my own on the the table saw so I thought I’d try using a router. The trouble is I need a 3/4” wide dadoe and only have a 1/2 router bit.
My thought was to set one straightedge where I want one side of the dadoe to be and the other straightedge 1/4” from the other side of the router base so that I could follow the first one, then move over and follow the other back.
Is this a reasonable technique or should I try something different?

-- Be honest, honorable, kind, work hard, and generally be awesome.


11 replies so far

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bondogaposis

4036 posts in 1818 days


#1 posted 08-11-2014 07:55 PM

Yep, that is the way i do it. Get one guide rail set up and clamped then use the shelf stock for a spacer to set the other guide rail and the dado width will be just right.

-- Bondo Gaposis

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ajosephg

1878 posts in 3027 days


#2 posted 08-11-2014 07:55 PM

That will work. Just remember that 3/4” plywood isn’t 3/4”.

-- Joe

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pintodeluxe

4859 posts in 2280 days


#3 posted 08-11-2014 08:00 PM

You could try this type of exact width dado jig, inspired from Woodsmith Shop plus a few modifications.
http://lumberjocks.com/pintodeluxe/blog/34885

Otherwise you can clamp two straightedges parallel, however I would recommend using a spacer. Do test cuts with the router and different spacers until the dado width is correct. Test it on scrap and see if it is repeatable.

Third option is to buy an undersized plywood 3/4” plywood bit, or full 3/4” bit and cut the dado in a single pass.

Fourth option, make a 1/2” dado. Then rabbet the mating piece to a 1/2” tongue.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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timbertailor

1592 posts in 891 days


#4 posted 08-11-2014 09:38 PM

That is what I would do. Everyone should have two low profile contractor’s clamps! Versatile and save you the trouble of making a jig.

-- Brad, Texas, https://www.youtube.com/user/tonkatoytruck/feed

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TheWoodenOyster

1275 posts in 1401 days


#5 posted 08-11-2014 11:14 PM

Bondo has it right.


That will work. Just remember that 3/4” plywood isn t 3/4”.

- ajosephg

^ Don’t ignore this

-- The Wood Is Your Oyster

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MT_Stringer

2854 posts in 2697 days


#6 posted 08-11-2014 11:49 PM

Check out The Wood Whisperer on You Tube. He has an exact width dado jig. Iy works as advertised.

-- Handcrafted by Mike Henderson - Channelview, Texas

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txn

135 posts in 926 days


#7 posted 08-12-2014 01:03 AM

Rockler has a plywood router bit set that has the actual size of all the plywoods

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HerbC

1592 posts in 2326 days


#8 posted 08-12-2014 01:42 AM



Rockler has a plywood router bit set that has the actual size of all the plywoods

- txn

Unfortunately there’s no real “standard” actual size for any of the plywood thicknesses you’ll get in most stores.

Herb

-- Herb, Florida - Here's why I close most messages with "Be Careful!" http://lumberjocks.com/HerbC/blog/17090

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Paul

721 posts in 1031 days


#9 posted 08-12-2014 03:01 AM



Rockler has a plywood router bit set that has the actual size of all the plywoods

- txn

This is false. Take a caliper to any piece of plywood and you will find deviations of thickness. If you buy from the big box store it’s a much larger deviation than if you buy from a reputable lumber yard.

Paul

View John's profile

John

166 posts in 1048 days


#10 posted 08-12-2014 03:07 AM

+1 for the wood whisperer exact width dado jig. Works great. Its all I use because I don’t have a dado blade for the table saw.

http://www.thewoodwhisperer.com/videos/exact-width-dado-jig/

Take the time to build the jig, you’ll be surprised how often you use it. IMO

-- I measured once, cut twice, and its still too short...

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mIps

187 posts in 1521 days


#11 posted 08-14-2014 02:19 AM

I tried building one of those exact fit things and it didn’t work worth a darn. Probably the fault of the builder, but still.

-- Be honest, honorable, kind, work hard, and generally be awesome.

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