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Holding screws in place

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Forum topic by BJODay posted 07-08-2017 12:35 AM 439 views 0 times favorited 13 replies Add to Favorites Watch
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BJODay

526 posts in 1779 days


07-08-2017 12:35 AM

Hi,
I’m repairing some dining room chairs for a friend. They have worked loose because the screws used to hold the seat in place fell out. This allowed more flex and eventually the doweled joints began to fail. I repaired one by cleaning up the joints, re-gluing the dowels and placing larger screws in the seat.

I replaced the #8 screws with #10s. The old #10s with #12s. The length could not be changed because longer screws would pop up through the seat and make in kinda uncomfortable.

I’m wondering if wood glue would help hold the screws in place? I know the glue wouldn’t adhere well to metal, but would it keep the hole tighter around the screws?

Thanks for any advice.
BJ


13 replies so far

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Loren

9624 posts in 3484 days


#1 posted 07-08-2017 12:43 AM

No, wood glue won’t hold screws. But you can
fill the holes with matchsticks. There are also
metal things that go in stripped screw holes
but I’ve never used them. Holes can be drilled
out and filled with a glued dowel too.

Probably the best solution is to knock out the
corner blocks and fully fill the holes in the
chair frame with a filler that holds screws,
re-glue the corner blocks and re-drill the
screw holes in the frame.

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BJODay

526 posts in 1779 days


#2 posted 07-08-2017 01:15 AM

Thanks Loren,
The larger diameter screw seem to hold well. I was just wondering if glue would make the repair last longer.
BJ

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Rick_M

10619 posts in 2216 days


#3 posted 07-08-2017 03:04 AM

I don’t know why wood glue wouldn’t hold a screw. I’ve made bases out of solid Elmer’s white glue and it’s pretty hard stuff. Wood glue joints are stronger than wood. I believe it will hold fine but I would drill out and fill the hole with wood plug or use a matchstick plus glue.

-- http://thewoodknack.blogspot.com/

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jonah

1455 posts in 3135 days


#4 posted 07-08-2017 03:48 AM

Wood glue does not stick to metal, pure and simple.

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MrUnix

5991 posts in 2035 days


#5 posted 07-08-2017 04:08 AM

I’ve used regular PVA glue on screws holding cabinet door hinges on, and it worked well. It may not stick to the metal very well, but it appears to provide greater friction between the two materials. You could also try CA or Epoxy, both of which claim to be able to adhere to metal.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Rick_M

10619 posts in 2216 days


#6 posted 07-08-2017 07:23 AM



Wood glue does not stick to metal, pure and simple.

- jonah


Neither does wood. That isn’t how screws work. He asked if glue will hold a screw, not if you could glue a screw. It’s not something I can quantify as I haven’t done any real testing, only speculate based on related information. I’ve put dabs of wood glue in screw holes when I didn’t want the screw to work loose over time and none of those did but I’ve also had screws without wood glue not come loose. But I’ve had screws that weren’t glued come loose. All I can go on is this, yellow wood glue is really a type of plastic that forms strong mechanical bonds in wood fibers. It should strengthen the fibers inside a screw hole and help the screw hold as the wood moves over the years. People sometimes use cyanoacrylate glue to reinforce tapped wood threads for the same reason. Like I said above, I agree with Loren that plugging the holes is the best solution but I would probably put a drop of glue on the threads if these screws have a history of working themselves loose. Even if it doesn’t help, I’m sure it won’t hurt.

-- http://thewoodknack.blogspot.com/

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jonah

1455 posts in 3135 days


#7 posted 07-08-2017 10:47 AM

It would be more precise to say that wood glue may help to reinforce the threads in a screw hole then, not that it helps to hold the screw in the hole. To me, the second one means that the glue sticks the screw to the wood, when that’s actually not what’s happening at all.

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Redoak49

2894 posts in 1825 days


#8 posted 07-08-2017 12:11 PM

Wood glue is not designed to hold screws.

The best solution is to use a matchstick, toothpick or similar. One needs to be careful not to use to much or too large a screw as you could split the wood.

I think epoxy would be a better choice than wood glue.

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johnstoneb

2640 posts in 2009 days


#9 posted 07-08-2017 01:32 PM

#1 The screws holding the seat on do just that. They do not add much if any to the structural integrity of the chair. To repair the chair correctly you must do as you did disassemble clean up and reglue the joint making sure they are tight before gluing. Glue will hold the screw into the seat but you will not be able to remove them with out destroying the hole. You can glue something like a match stick or toothpicks into the existing hole to tighten it up.

I have in screw holes soaked some CA into the hole then driven the screw in. The CA reinforces the wood fibers and the wood will hold the screw better. this only work in holes that are still in fairly good condition


-- Bruce, Boise, ID

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BJODay

526 posts in 1779 days


#10 posted 07-08-2017 01:56 PM

Thanks for the advice and comments.
BJ

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PaulHWood

411 posts in 2089 days


#11 posted 07-08-2017 03:06 PM

forstner bit, and glue a dowel in

-- -Paul, South Carolina Structural Engineer by trade, Crappy Woodworker by choice

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rodneywt1180b

154 posts in 222 days


#12 posted 07-08-2017 04:12 PM

Epoxy is structural and will hold threads. You can fill the holes with epoxy then redrill the holes and put the screws back in.
Drilling and filling the hole with a dowel is a time tested method that works too.
Both methods have the advantage of being able to use the original screws. Modern screws generally don’t match the old hardware.

-- Rodney, Centralia, WA, USA www.etsy.com/shop/ASturdyStick

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Rick_M

10619 posts in 2216 days


#13 posted 07-08-2017 05:03 PM



It would be more precise to say that wood glue may help to reinforce the threads in a screw hole then,

- jonah


Which is exactly what I said.

-- http://thewoodknack.blogspot.com/

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