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Help with Screw Up on Breadboard Extended Tenon

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Forum topic by Scottlj posted 10-26-2016 02:00 AM 642 views 0 times favorited 11 replies Add to Favorites Watch
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Scottlj

84 posts in 1556 days


10-26-2016 02:00 AM

Topic tags/keywords: stub tenon cut off tenon breadboard draw bored

So. Rushing with power tools is never a good idea. Pressed for time to go pick up kid from daycare, I mistakenly cut off one of the extended tenons on a table top intended to slip into a breadboard. (You can see this on the closest table top, far right. You know, the part that looks like something is conspicuously missing as compared to the others.) The goal is to have the stub tenon run the width of the table top and then to drawbored the extended tenons into the breadboard, from the bottom only so you won’t even see the plug. The rest of the tenons came out ok. This, of course, was the last one I was cutting.


This is – for me – somewhat expensive 5/4 Red Oak. The last thing I can do is re-do this whole top and I sure don’t want to shorten the whole thing. Any ideas on solutions to fix this? I could maybe get away with just skipping that side. Probably be ok. Or I could use a shorter tenon and just screw it on to the stub tenon.

The stub part of the tenon is 3/4” and the extended tenons are an additional 1 1/2” The width of the tenons is 3/8” and the thickness of the 5/4 overall is just a bit over 1”

Any ideas on how to save this?

Thanks for any ideas!


11 replies so far

View Aj2's profile

Aj2

1177 posts in 1636 days


#1 posted 10-26-2016 02:14 AM

Scott it’s fixable,Since its long grain you just have to route out a mortise and glue a tenon in there.
Part of woodworking is fixing slips like that.
Take all the time you need to make the part so you feel good about it.
Woodworkers need to know they can fix most mistakes.Thats how we build our confidence.
I know someone is going to suggest dowels.That would be taking the easy way out.

Good luck

Aj

-- Aj

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Scottlj

84 posts in 1556 days


#2 posted 10-26-2016 03:36 AM

Ah. I think I see what you’re saying. I can just cut off that end’s stub tenon and treat that section’s intended tenon as if it were loose tenon joinery. Relatively simple. A bit more time consuming than getting it right, but that’s the payment for being careless.

Thanks Aj. I’ve been annoyed with myself all day over this. At least I’ve got an out now!

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Aj2

1177 posts in 1636 days


#3 posted 10-26-2016 03:53 AM

I like the black streaks in your top.I often look for boards with that.
Good luck with the fix.

Aj

-- Aj

View jerryminer's profile

jerryminer

805 posts in 1279 days


#4 posted 10-26-2016 06:05 AM

I agree with Aj2—replace the missing tenon with a new tenon.

Since the underside of the table won’t (usually) be seen, you can rout out a “Dutchman” on the bottom to create the new tenon—easier than mortising into the end grain:

-- Jerry, making sawdust professionally since 1976

View Tabletop's profile

Tabletop

127 posts in 585 days


#5 posted 10-26-2016 07:12 AM

I agree with AJ and Jerry. I would probably put a mortise in the end and glue a new tenon in it. Although haven’t really thought about Jerry’s idea. Looks good and no one would ever know it is there, except you and of course AJ, Jerry and I. Lol! Have fun and be safe.

View rwe2156's profile

rwe2156

2714 posts in 1319 days


#6 posted 10-26-2016 12:34 PM

You got the fix.

I would add when doing draw bores the pins need to go all the way through if you want to do it right.

There is nothing wrong with pins showing.

-- Everything is a prototype thats why its one of a kind!!

View bondogaposis's profile (online now)

bondogaposis

4478 posts in 2189 days


#7 posted 10-26-2016 01:03 PM

Okay, you got a fix. Remember in woodworking, “go slow, it’s faster”.

-- Bondo Gaposis

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Scottlj

84 posts in 1556 days


#8 posted 10-26-2016 01:20 PM

Hah… yes. Slower is much faster in this case.

I think I will send all the pins through. They’ll look fine. Might be a trip to store today to get some matching oak wood dowels. I suppose I could use darker pins for affect. I’m assuming expansion on something like a 3/4” dowel itself is so small as to be irrelevant, but maybe better to match everything?

The next tricky part will be attaching the extension slides. Those I bought. I’m planning on using threaded inserts in the top to attach them so I can break it down and get it into my house. I’ve got some threaded rod I can cut to custom length. This is by far one of the more complicated things I’ve attempted so far.

Here’s what the pieces look like starting to come together. (Pre-breadboard routing on the top.) I’m hoping after I get the breadboards dialed in I can bring the whole tops and the leaves to a shop and use a large sander to flatten them out. The glue up is actually not too bad, but a big machine would make things perfect rather than hours trying to plane or sand.

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Scottlj

84 posts in 1556 days


#9 posted 10-30-2016 12:39 AM

Alright… fixed!

This is the first time I’ve been really working with mortise / tenons. I’ve done some pieces with pocket hole joinery, then loose tenon joinery with a Beadlock ‘loose’ tenon system, (they’re not really loose at all of course), and some biscuit joinery. Also some dovetails for drawers. But this… this is first time doing something like this.

Today I started the mortises for the longer tenons into the breadboards. Time consuming, but working out. Here’s the fix based on Aj’s original suggestion. Jerry’s idea looks good if for some reason you maybe blow out a portion and need to recover. But since I had room in the 5/4 top, it wasn’t a big deal to drill out 3/8” mortise right into the top. First I just took some scrap and routed a large tenon to the 3/8” thickness of the others. Then glued it into the mortise. It’s a little sloppy, but no one will ever see it.

Thanks to all who commented. I knew there’d be a fix on here.

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Scottlj

84 posts in 1556 days


#10 posted 12-15-2016 03:45 AM

FYI… finished project here… http://lumberjocks.com/projects/284402

Thanks again for the help.

View jerryminer's profile

jerryminer

805 posts in 1279 days


#11 posted 12-15-2016 08:20 AM

Good for you, Scott! Looks terrific. Glad it all worked out.

Beautiful table! Thanks for sharing

-- Jerry, making sawdust professionally since 1976

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