cutting tenions with dado set - Woodworking Talk - Woodworkers Forum
 
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post #1 of 16 Old 01-10-2015, 07:36 PM Thread Starter
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cutting tenions with dado set

I am using knotty Alder 3/4" wood. My project calls for cutting several pieces with a grove 3/8 wide down both sides of each piece, in the middle of the edge which I have done without a problem. I am getting into trouble cutting a 3/8 tenion 1/4" long on the ends of each piece. The dado blade sometimes tears a chunck off the very edge of the wood as I finish the cut and this will show when I fit the piece into the grove of another piece. The finished product will be a frame with a panel in the middle.

I have tried a very slow cut but it doesn't prevent it. How can I prevent that tearout on the corner as I make the cut with a dado blade?

Hope my description makes sense.
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post #2 of 16 Old 01-10-2015, 07:38 PM
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That's a common issue

A simple solution is to use a "backer" when cutting the dado to prevent the tearout.

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #3 of 16 Old 01-10-2015, 08:28 PM
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Quote:
Originally Posted by woodnthings View Post
A simple solution is to use a "backer" when cutting the dado to prevent the tearout.
I agree.

Are you sure the dado is sharp. You could also make score cuts with the table saw blade but it adds lime and work to the process.

Al


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post #4 of 16 Old 01-10-2015, 09:09 PM
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It's tearing out the grain on the back side....easiest solution is a backer block. If the dado requires more than one pass to get the length of the tennon, you can start at the shoulder and then move to the end...this helps. But really just using a backer is a super cheap easy solution...

The tools don't make the craftsman....
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post #5 of 16 Old 01-10-2015, 09:47 PM
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I here a double echo.

Al


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post #6 of 16 Old 01-10-2015, 09:50 PM
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Quote:
Originally Posted by Al B Thayer View Post
I here a double echo.

Al

Oh? Where?

The tools don't make the craftsman....
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post #7 of 16 Old 01-10-2015, 10:45 PM
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Quote:
Originally Posted by woodnthings View Post
A simple solution is to use a "backer" when cutting the dado to prevent the tearout.
Quote:
Originally Posted by Al B Thayer View Post
I agree.

Al
Quote:
Originally Posted by ryan50hrl View Post
It's tearing out the grain on the back side....easiest solution is a backer block.
Quote:
Originally Posted by Al B Thayer View Post
I here a double echo.

Al

echo....echo....
I guess we all agree....for a change.

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #8 of 16 Old 01-10-2015, 10:45 PM
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Hell has frozen over.

The tools don't make the craftsman....
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post #9 of 16 Old 01-10-2015, 11:18 PM
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I haven't used a dado to make a tenon in forever. I always use a blade. Put the wood vertical against the fence (or tenon jig for large runs) and make two cuts, then lay the wood down and cut the shoulders. You always keep the same side of the wood against the fence and you can be assured that all your tenons will be the same thickness even if the wood is varying thickness.

Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Finishing is 3 parts chemistry and 1 part VooDoo http://lrgwood.com
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post #10 of 16 Old 01-10-2015, 11:27 PM
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Quote:
Originally Posted by Leo G View Post
I haven't used a dado to make a tenon in forever. I always use a blade. Put the wood vertical against the fence (or tenon jig for large runs) and make two cuts, then lay the wood down and cut the shoulders. You always keep the same side of the wood against the fence and you can be assured that all your tenons will be the same thickness even if the wood is varying thickness.
Meh, I skipped all that and went right to buying a tenoner.
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post #11 of 16 Old 01-10-2015, 11:42 PM
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I use the delta tennoning jig 90% of the time....and actually prefer doing it that way.

The tools don't make the craftsman....
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post #12 of 16 Old 01-10-2015, 11:57 PM
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A 1/4" tenon isn't very much. It's not much better than a butt joint.

As far as the tear out, I make tenons all the time with a dado blade using both a table saw and a radial arm saw. Something sounds very wrong with the set you have.
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post #13 of 16 Old 01-11-2015, 12:47 PM
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cutting tenions with dado set

If you have the right router lift you can cut both mortise and tenon on the router table. Super fast without tear out.

Al


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post #14 of 16 Old 01-11-2015, 12:48 PM
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cutting tenions with dado set

Quote:
Originally Posted by Steve Neul View Post
A 1/4" tenon isn't very much. It's not much better than a butt joint.

As far as the tear out, I make tenons all the time with a dado blade using both a table saw and a radial arm saw. Something sounds very wrong with the set you have.
.... deleted my post.

Al


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post #15 of 16 Old 01-12-2015, 11:17 AM Thread Starter
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The backer board worked well. Thank you, all, for your responses.
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post #16 of 16 Old 01-12-2015, 11:28 AM
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Good to hear...it's always nice when there's a 25 cent solution to a problem.

The tools don't make the craftsman....
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