LumberJocks

Simple newbee question on joint vs wood movement

  • Advertise with us

« back to Woodworking Skill Share forum

Forum topic by TEK73 posted 11-08-2020 12:40 PM 530 views 0 times favorited 7 replies Add to Favorites Watch
View TEK73's profile

TEK73

330 posts in 723 days


11-08-2020 12:40 PM

Topic tags/keywords: question beech joining modern

Hi

I’m experienced enough to know that wood movement is something to consider when building something.
But to inexperienced to know the practice implications.

I’m building a monitor stand for my daughter, and have joined the plate itself (will be rounded edges and stained black).
It will be two supports under it. Those will be in 90 degrees to the wood grain in the top itself.
My initial idea is to just glue dem on and be done with it.
I am however concerned that the wood movement will cause something to break if I do so.
Or am I just over cautious?

The top is 90cm long, 30cm deep, 16mm thick and made out of beech.

How would you suggest I mount the supports (or legs if you like)?

-- It’s good to have an end to journey toward; but it is the journey that matters, in the end. - Ursula K. LeGuin


7 replies so far

View Fred Hargis's profile

Fred Hargis

6850 posts in 3509 days


#1 posted 11-08-2020 01:43 PM

There’s several ways to do this. Honestly, I’m not sure there would be a problem if you glued the whole thing corss grain, but it’s best not to take chances. You could just apply glue to the middle 5” (13 cm) or so. Or you could screw it on with some screws in the center if you don’t mind the exposed screw heads.

-- Our village hasn't lost it's idiot, he was elected to congress.

View bondogaposis's profile

bondogaposis

5953 posts in 3367 days


#2 posted 11-08-2020 02:10 PM

I think you are right to be concerned. Eventually that glue bond is going to break or the top could split. If it was mine I would build a traditional leg and apron type base and either use figure 8 fasteners or z clips to attach the top.

-- Bondo Gaposis

View Axis39's profile

Axis39

438 posts in 612 days


#3 posted 11-08-2020 02:27 PM

Dowels, biscuits, short mortise and tenon… Heck, even some screws might help (but, of course, they’ll show, unless you put in some plugs)

The biggest problem is you are gluing a relatively small section of crossgrain. A little mechanical assistance may not be a bad idea.

The only other issue I see is the possibility of sagging… But, that’s not what you asked about.

-- John F. SoCal transplant, chewer uppper of good wood

View TEK73's profile

TEK73

330 posts in 723 days


#4 posted 11-08-2020 02:33 PM

Thanks for your input!
I think I’ll go for better safe than sorry.
Do not want any visible screw heads from the top, bit Indo have some M6 inserts I’ll try to use.

Having some problems fastening them in hardwood, I’ll recommend this technique to anyone seeing this.

-- It’s good to have an end to journey toward; but it is the journey that matters, in the end. - Ursula K. LeGuin

View TEK73's profile

TEK73

330 posts in 723 days


#5 posted 11-08-2020 08:32 PM

Regarding the earlier comment on sag.
The span between the legs are 48cm (almost 19”).
The top is made out of hardwood (beech) that is 15mm thick.
There ill be two monitors, each probably located quite close to each leg.
It feels quite sturdy, but should I be worried about sag?
I may make a track and mount a steel bar as support if you belive it will be nessesary…

-- It’s good to have an end to journey toward; but it is the journey that matters, in the end. - Ursula K. LeGuin

View LesB's profile

LesB

2882 posts in 4458 days


#6 posted 11-09-2020 01:10 AM


Thanks for your input!
I think I’ll go for better safe than sorry.
Do not want any visible screw heads from the top, bit Indo have some M6 inserts I’ll try to use.

Having some problems fastening them in hardwood, I’ll recommend this technique to anyone seeing this.

I have used my drill press to apply pressure while I turn it my hand. That way I can make sure the insert goes in straight. Also a little paraffin or bees wax on the threads helps…that works for screws in hard wood too.

- TEK73


-- Les B, Oregon

View Robert's profile

Robert

4456 posts in 2496 days


#7 posted 11-09-2020 02:31 PM

To be totally “correct” you’ll need to slot one of the holes to allow for movement.

That said, if totally acclimated to the environment, you’re not going to get much movement in a 12” wide board. I’ve been taught to always figure 1/8” per foot and I’ve always followed that when designing and building.

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

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com