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Author Topic: Sloted C-Chanel for making table tops  (Read 1620 times)

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Offline bholmsten

  • Posts: 34
Sloted C-Chanel for making table tops
« on: February 14, 2023, 05:36 PM »
I am planning on building a kitchen table from old lumber that has sentimental value for my friend.
I've seen on YouTube where people router a slotted C-Chanel under the table top for support and expansion contraction issues.
If I use Domino-XL and wood glue for joining the boards lengthwise edge grain is the C-Chanel needed?
Thanks
« Last Edit: February 14, 2023, 05:51 PM by bholmsten »
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Offline nvalinski

  • Posts: 185
Re: Sloted C-Chanel for making table tops
« Reply #1 on: February 15, 2023, 09:21 AM »
I'd still recommend it. The dominoes would act similar to a spline joint/biscuits, which keeps the boards aligned with each other vertically so that the surfaces remain flush. But, with a wide table, the table as a whole is still able to cup/twist, even with the seams staying flush. The C channels act as a low profile reinforcement to keep the table flat, very similar to what the skirt of a more traditional table or piece of furniture will do.
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Offline bholmsten

  • Posts: 34
Re: Sloted C-Chanel for making table tops
« Reply #2 on: February 21, 2023, 03:15 PM »
Thanks for your response
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Offline Michael Kellough

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Re: Sloted C-Chanel for making table tops
« Reply #3 on: February 21, 2023, 05:08 PM »
I’m confused by the photo. I suppose you’re asking about the (apparently) embedded strips but I can’t get past the table legs in this picture which are likely to cause the table to split if/when it dries. If the construction is done in winter when humidity is very low maybe it’ll be okay as the wood expands in the warmer months.
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Offline Sparktrician

  • Posts: 4394
Re: Sloted C-Chanel for making table tops
« Reply #4 on: February 21, 2023, 05:54 PM »
Blacktail Studio has a video you might want to watch regarding the use of embedded C-channel in tabletops. 

« Last Edit: February 22, 2023, 08:53 AM by Sparktrician »
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- Willy -

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  The capacity for occasional blundering is inseparable from the capacity to bring things to pass."

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Offline Crazyraceguy

  • Posts: 2857
Re: Sloted C-Chanel for making table tops
« Reply #5 on: February 21, 2023, 06:53 PM »
Quote from: Michael Kellough on February 21, 2023, 05:08 PM
I’m confused by the photo. I suppose you’re asking about the (apparently) embedded strips but I can’t get past the table legs in this picture which are likely to cause the table to split if/when it dries. If the construction is done in winter when humidity is very low maybe it’ll be okay as the wood expands in the warmer months.

Yes, ^^^ slotting the C channels w/o doing the same on the legs is working against yourself.
That is a theme you have to carry through the whole job, including breadboard ends, if equipped.
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Offline Peter Halle

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Re: Sloted C-Chanel for making table tops
« Reply #6 on: February 21, 2023, 08:00 PM »
When the word "slotting" is being used here, I hope that includes making the mounting holes for both the legs and the c-channel larger then the mounting screws or slotting those to allow for movement across the board.

Peter
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Offline Sparktrician

  • Posts: 4394
Re: Sloted C-Chanel for making table tops
« Reply #7 on: February 22, 2023, 08:55 AM »
Quote from: Peter Halle on February 21, 2023, 08:00 PM
When the word "slotting" is being used here, I hope that includes making the mounting holes for both the legs and the c-channel larger then the mounting screws or slotting those to allow for movement across the board.

Peter

Peter, take a look at the way Cam Anderson does it in the video I referenced.  I really like the way he seems to have thought it out to allow for expansion and contraction while routing for the C-channel. 
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- Willy -

  "Show us a man who never makes a mistake and we will show a man who never makes anything. 
  The capacity for occasional blundering is inseparable from the capacity to bring things to pass."

 - Herman Lincoln Wayland (1830-1898)

Online Cheese

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Re: Sloted C-Chanel for making table tops
« Reply #8 on: February 22, 2023, 12:12 PM »
Quote from: Sparktrician on February 21, 2023, 05:54 PM
Blacktail Studio has a video you might want to watch regarding the use of embedded C-channel in tabletops. 

Thanks for that Sparky...that was well worth watching.  [big grin]

Love the screw inserts with the cup point set screws, great idea.

The Murakoshi style bolts was certainly interesting along with the Concept 13 c-channels.

Would like to know more about the N3 Nano coat, there's really no information on the web site.

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Offline Michael Kellough

  • Posts: 6217
Re: Sloted C-Chanel for making table tops
« Reply #9 on: February 23, 2023, 01:52 PM »
Yes, that video was very good! I’m going to check other videos of his.

I’m also going to borrow the adding a router template to the work with double stick tape technique.
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Offline luvmytoolz

  • Posts: 725
Re: Sloted C-Chanel for making table tops
« Reply #10 on: February 23, 2023, 03:28 PM »
Quote from: Michael Kellough on February 23, 2023, 01:52 PM
Yes, that video was very good! I’m going to check other videos of his.

I’m also going to borrow the adding a router template to the work with double stick tape technique.

I love his videos and actually signed up for his epoxy course which is brilliant, but that's the one thing I really don't understand with Cam, he uses c channels from one supplier in standard sizes, but doesn't have a one piece template for the sizes he uses, makes no sense to me. I do loads of template routing and find it's far easier and simple to make a single template in MDF big enough to just clamp down.

No tape needed, no possible movement or error.
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Offline Michael Kellough

  • Posts: 6217
Re: Sloted C-Chanel for making table tops
« Reply #11 on: February 23, 2023, 04:59 PM »
I agree. He could  easily make a pair of L shaped templates he could slide together to make slots of different lengths for the same channels. If I have to do the same operation more than three times I’ll make a real template or jig. If it’s more complicated than drilling holes.

But I do think that technique looks good for quickly one off templates.
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Offline Sparktrician

  • Posts: 4394
Re: Sloted C-Chanel for making table tops
« Reply #12 on: February 23, 2023, 06:41 PM »
This is a perfect application for the now-gone MFS.  Just sayin'...   [crying]
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- Willy -

  "Show us a man who never makes a mistake and we will show a man who never makes anything. 
  The capacity for occasional blundering is inseparable from the capacity to bring things to pass."

 - Herman Lincoln Wayland (1830-1898)

Offline rst

  • Posts: 2993
Re: Sloted C-Chanel for making table tops
« Reply #13 on: February 23, 2023, 06:42 PM »
Sparktrician...Word!
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