Est. 1998 — 27 years of woodworking knowledge
Gluin & Screwin...
Bri in Mtl
>If you want to reinforce a glued up joint with a screw(s)/dowels would you apply the screw during the glue up or after the glue has dried/cured?
I'm wondering if by applying a screw after a glueup one would be applying tension to the joint more than just simply reinforcing the joint.
Re: Gluin & Screwin...
Thomas Skaggs, Foothills of Mount Level
>I would install the screws after the glue is dried. I pre-drill and set the screw without torquing too much. That allows me to clamp the joint evenly and where I want it and not worry about screw or peg alignment problems or joint alignment issues caused by the mechanical actions of screws while being installed.
Tom
Re: Gluin & Screwin...
Jim Shaver Oakville, Ont.
>Hi Bri,
I apply the glue then screw while it's wet, the screw applies the clamping force in the joint, we know the glue will always be a stronger joint once the glue dries.
I also do this when I am glueing up a joint like a breadboard end, in this example I glued the centre section and used a screw, but my end glueless sections are mechanical and allow for movement from the anchored glue section. I also created a spring joint at the centre to allow the ends to snug up tight to the top.
Take care,
Jim
Re: Gluin & Screwin...
Steve Schoene
>Screws seldom "reinforce" joints, they mostly provide a mode of failure as they work against the wood when seasonal movement occurs. That's not to say screws have no place, but I believe it is where wood needs to be secured to another piece, but still have the opportunity to move--such as when attaching a table top to the rails, or holding the outer ends of breadboard ends. Or, of course when things need to be able to be disassembled in the future. But, none of these involve glue.
I'm not too fond of the kreg screw system either, but when you really don't need maximum or long-lived strength they may get the job done.
Re: Gluin & Screwin...
Lee Ohmart
>I have always either glued and screwed or glued and clamped and I alwys apply the glue first. Otherwise it's a real pain to get it into the joint.
Re: So that's my problem! LOL!!!
Jim Toews
>
Yeah but...
Bri in Mtl
>..when you chose glue and screw, did you screw the screw in while the glue was wet or when it was dry?
FWIW I mostly concerned with the screws that Sam Maloof uses to reforce is rocker leg to seat joints.
Re: Gluin & Screwin...
jmohnike
>I clamp and set everything in place, predrill and install screws, without tourqueing (sp) remove the screws and clamps then apply the glue reclamp and reset the screws. I have had problems in the past with the wood creeping during clamping with wet glue, the screws act as an alignment pin and prevents this from happening. This works good for me, but I am sure any of the other suggestions will work as well.
Joe
Re: Gluin & Screwin...
Lee Schierer, McKean, PA
>If I paln touse glue and screws to attach something. I use the screws to provide the clamping force while the glue dries. I usually dry fit the parts with just the screws, then add the glue at final assembly.
If you properly size your clearance hole and pilot hole you should apply minimal stress to the wood. In proper screw joint construction the piece being held should have a clearance hole the same size or slightly larger than the diameter of the screw shaft or maximum diameter of the largest part of the screw thread which ever is larger. This allows the screw to do its job and actually pull the pieces together.
In hardwoods you should always lubricate the screw threads with beeswax before the screw is driven in.
Lee
Bee's Wax
Jim Shaver Oakville, Ont.
>Hi Lee,
All my screws are dressed with the bee's wax you molded for me from your hives...a nice touch!
take care,
Jim
Re:Lee's Bee's Wax
George@Colonel's Workshop-Havertown PA
>Good Afternoon Jim,
Lee got me started using his little bee's wax ingots religiously. Notwithstanding, I still manage to "screw up" my work--while the glue dries, of course. I clamp a dry fit first, drill pilot holes, install the waxed screws, disassemble, apply glue, screw into position and then clamp.
George
Re: The way I see it
Glenn Madsen near San Francisco
>The screws are very specific clamps. They work best when the glue is fresh, and the joint needs pressure while the glue dries.
And Norm would use brads, of course. ;)
The screw also provides strength, of course, and in chairs, in our household, anything that can strengthen a joint is welcome.
Re: Gluin & Screwin...
Robin Corell in Atascadero, CA
>Another thing that can help is to drill a very slight counter sink on the bottom of the top piece of wood. This provides a place for the fibers that enevitably raise up around where a screw enters the second piece of wood and can prevent a tight joint.
Robin Corell