On Monday, March 5, 2012 4:49:27 PM UTC-6, Leon wrote:
> On 3/5/2012 1:07 PM, Michael wrote:
> > On Monday, March 5, 2012 4:56:16 AM UTC-6, JayPique wrote:
> >> On Sunday, March 4, 2012 10:37:58 PM UTC-5, Michael wrote:
> >>> I need to re-glue a dado joint on a bench made of rock maple. It look=
s like it was originally glued with yellow wood glue. Even after scraping, =
I would guess that yellow wood glue is not my best option. Any suggestions?
> >>>
> >>> Thanks,
> >>>
> >>> Mike
> >>
> >> If by dado joint you mean you have a cross-grain groove cut into a boa=
rd into which another board sits with the same grain orientation (like a sh=
elf into a groove in the side of a bookcase) then you have basically zero l=
ong grain to long grain gluing surface to begin with. I'd try to figure ou=
t why the joint failed in the first place, but my suggestion is that you tr=
y to reinforce the joint with biscuits or dowels or even screws and use epo=
xy.
> >> JP
> >
> > It's end grain to long grain. Two four feet long (1 X 8s) are dadoed in=
to a single vertical flat piece that serves as the sides of the box and the=
legs. I really can't tell why the joint failed. All the others seem tight =
and well done.
> >
> > Mike
>=20
> Expansion and contraction made the joint fail. Glue one end of the=20
> joint, not the whole length, to allow for expansion and contraction.
What kind of glue would you recommend?
Thanks for your help.
Mike
On 3/5/2012 5:38 PM, Michael wrote:
> On Monday, March 5, 2012 4:49:27 PM UTC-6, Leon wrote:
>> On 3/5/2012 1:07 PM, Michael wrote:
>>> On Monday, March 5, 2012 4:56:16 AM UTC-6, JayPique wrote:
>>>> On Sunday, March 4, 2012 10:37:58 PM UTC-5, Michael wrote:
>>>>> I need to re-glue a dado joint on a bench made of rock maple. It looks like it was originally glued with yellow wood glue. Even after scraping, I would guess that yellow wood glue is not my best option. Any suggestions?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Mike
>>>>
>>>> If by dado joint you mean you have a cross-grain groove cut into a board into which another board sits with the same grain orientation (like a shelf into a groove in the side of a bookcase) then you have basically zero long grain to long grain gluing surface to begin with. I'd try to figure out why the joint failed in the first place, but my suggestion is that you try to reinforce the joint with biscuits or dowels or even screws and use epoxy.
>>>> JP
>>>
>>> It's end grain to long grain. Two four feet long (1 X 8s) are dadoed into a single vertical flat piece that serves as the sides of the box and the legs. I really can't tell why the joint failed. All the others seem tight and well done.
>>>
>>> Mike
>>
>> Expansion and contraction made the joint fail. Glue one end of the
>> joint, not the whole length, to allow for expansion and contraction.
>
> What kind of glue would you recommend?
>
> Thanks for your help.
>
> Mike
>
Epoxy if you want to just glue from where you are at now. Or more
yellow glue if you take the wood back to bare surfaces again, void of
glue residue.
And addendum to glueing one end, if wood movement is not critical and
you can also simply glue the middle section of the joint and let the to
outer edges move in and out. If you want a particular edge to remain in
registration with another, glue that location and let the opposite
edge/end do the moving.
On Mon, 5 Mar 2012 15:38:09 -0800 (PST), Michael
<[email protected]> wrote:
>On Monday, March 5, 2012 4:49:27 PM UTC-6, Leon wrote:
>> On 3/5/2012 1:07 PM, Michael wrote:
>> > On Monday, March 5, 2012 4:56:16 AM UTC-6, JayPique wrote:
>> >> On Sunday, March 4, 2012 10:37:58 PM UTC-5, Michael wrote:
>> >>> I need to re-glue a dado joint on a bench made of rock maple. It looks like it was originally glued with yellow wood glue. Even after scraping, I would guess that yellow wood glue is not my best option. Any suggestions?
>> >>>
>> >>> Thanks,
>> >>>
>> >>> Mike
>> >>
>> >> If by dado joint you mean you have a cross-grain groove cut into a board into which another board sits with the same grain orientation (like a shelf into a groove in the side of a bookcase) then you have basically zero long grain to long grain gluing surface to begin with. I'd try to figure out why the joint failed in the first place, but my suggestion is that you try to reinforce the joint with biscuits or dowels or even screws and use epoxy.
>> >> JP
>> >
>> > It's end grain to long grain. Two four feet long (1 X 8s) are dadoed into a single vertical flat piece that serves as the sides of the box and the legs. I really can't tell why the joint failed. All the others seem tight and well done.
>> >
>> > Mike
>>
>> Expansion and contraction made the joint fail. Glue one end of the
>> joint, not the whole length, to allow for expansion and contraction.
>
>What kind of glue would you recommend?
>
>Thanks for your help.
1) Saw/plane/joint the two edges to remove -all- of the old glue.
(It won't work otherwise, and you can ask anyone who has ever tried to
reglue chair legs for that statistic) 2) Throw a bisquit or three in
the edges for strength, then glue with Titebond I or II if inside,
Titebond III if used outside. (Then pray. ;)
--
It is characteristic of all deep human problems that they are
not to be approached without some humor and some bewilderment.
-- Freeman Dyson
On Monday, March 5, 2012 4:56:16 AM UTC-6, JayPique wrote:
> On Sunday, March 4, 2012 10:37:58 PM UTC-5, Michael wrote:
> > I need to re-glue a dado joint on a bench made of rock maple. It looks =
like it was originally glued with yellow wood glue. Even after scraping, I =
would guess that yellow wood glue is not my best option. Any suggestions?
> >=20
> > Thanks,
> >=20
> > Mike
>=20
> If by dado joint you mean you have a cross-grain groove cut into a board =
into which another board sits with the same grain orientation (like a shelf=
into a groove in the side of a bookcase) then you have basically zero long=
grain to long grain gluing surface to begin with. I'd try to figure out w=
hy the joint failed in the first place, but my suggestion is that you try t=
o reinforce the joint with biscuits or dowels or even screws and use epoxy.
> JP
It's end grain to long grain. Two four feet long (1 X 8s) are dadoed into a=
single vertical flat piece that serves as the sides of the box and the leg=
s. I really can't tell why the joint failed. All the others seem tight and =
well done.
Mike
On Sunday, March 4, 2012 10:37:58 PM UTC-5, Michael wrote:
> I need to re-glue a dado joint on a bench made of rock maple. It looks li=
ke it was originally glued with yellow wood glue. Even after scraping, I wo=
uld guess that yellow wood glue is not my best option. Any suggestions?
>=20
> Thanks,
>=20
> Mike
If by dado joint you mean you have a cross-grain groove cut into a board in=
to which another board sits with the same grain orientation (like a shelf i=
nto a groove in the side of a bookcase) then you have basically zero long g=
rain to long grain gluing surface to begin with. I'd try to figure out why=
the joint failed in the first place, but my suggestion is that you try to =
reinforce the joint with biscuits or dowels or even screws and use epoxy.
JP
On Tuesday, March 6, 2012 1:32:57 PM UTC-6, Father Haskell wrote:
> On Mar 5, 2:07=A0pm, Michael <[email protected]> wrote:
> > On Monday, March 5, 2012 4:56:16 AM UTC-6, JayPique wrote:
> > > On Sunday, March 4, 2012 10:37:58 PM UTC-5, Michael wrote:
> > > > I need to re-glue a dado joint on a bench made of rock maple. It lo=
oks like it was originally glued with yellow wood glue. Even after scraping=
, I would guess that yellow wood glue is not my best option. Any suggestion=
s?
> >
> > > > Thanks,
> >
> > > > Mike
> >
> > > If by dado joint you mean you have a cross-grain groove cut into a bo=
ard into which another board sits with the same grain orientation (like a s=
helf into a groove in the side of a bookcase) then you have basically zero =
long grain to long grain gluing surface to begin with. =A0I'd try to figure=
out why the joint failed in the first place, but my suggestion is that you=
try to reinforce the joint with biscuits or dowels or even screws and use =
epoxy.
> > > JP
> >
> > It's end grain to long grain. Two four feet long (1 X 8s) are dadoed in=
to a single vertical flat piece that serves as the sides of the box and the=
legs. I really can't tell why the joint failed. All the others seem tight =
and well done.
> >
> > Mike
>=20
> Racking stress. Reinforce with a cleat.
I think that's probably the case. I'm going to use epoxy since I don't want=
to cut back on the tight-fitting dado. Thanks everyone for the good inform=
ation.
Mike
On 3/4/2012 9:37 PM, Michael wrote:
> I need to re-glue a dado joint on a bench made of rock maple. It looks like it was originally glued with yellow wood glue. Even after scraping, I would guess that yellow wood glue is not my best option. Any suggestions?
>
> Thanks,
>
> Mike
The type of glue was probably not so much the problem as is the way it
was applied.
If you are gluing lo9ng grain across the grain the natural expansion and
contraction of the wood will cause a glue joint to fail if the wood does
not expand at the same rate on both sides of the joint.
A common practice is to only glue one end of the joint and allow the
wood to slip in the joint with climate changes and natural expansion and
contraction.
Or use a mechanical fastener like a nut, bolt, and washer through over
sized holes to allow for the expansion.
I second that approach. That is solid advice.
On 3/5/2012 5:56 AM, JayPique wrote:
> On Sunday, March 4, 2012 10:37:58 PM UTC-5, Michael wrote:
>> I need to re-glue a dado joint on a bench made of rock maple. It looks like it was originally glued with yellow wood glue. Even after scraping, I would guess that yellow wood glue is not my best option. Any suggestions?
>>
>> Thanks,
>>
>> Mike
>
> If by dado joint you mean you have a cross-grain groove cut into a board into which another board sits with the same grain orientation (like a shelf into a groove in the side of a bookcase) then you have basically zero long grain to long grain gluing surface to begin with. I'd try to figure out why the joint failed in the first place, but my suggestion is that you try to reinforce the joint with biscuits or dowels or even screws and use epoxy.
> JP
On Mar 5, 2:07=A0pm, Michael <[email protected]> wrote:
> On Monday, March 5, 2012 4:56:16 AM UTC-6, JayPique wrote:
> > On Sunday, March 4, 2012 10:37:58 PM UTC-5, Michael wrote:
> > > I need to re-glue a dado joint on a bench made of rock maple. It look=
s like it was originally glued with yellow wood glue. Even after scraping, =
I would guess that yellow wood glue is not my best option. Any suggestions?
>
> > > Thanks,
>
> > > Mike
>
> > If by dado joint you mean you have a cross-grain groove cut into a boar=
d into which another board sits with the same grain orientation (like a she=
lf into a groove in the side of a bookcase) then you have basically zero lo=
ng grain to long grain gluing surface to begin with. =A0I'd try to figure o=
ut why the joint failed in the first place, but my suggestion is that you t=
ry to reinforce the joint with biscuits or dowels or even screws and use ep=
oxy.
> > JP
>
> It's end grain to long grain. Two four feet long (1 X 8s) are dadoed into=
a single vertical flat piece that serves as the sides of the box and the l=
egs. I really can't tell why the joint failed. All the others seem tight an=
d well done.
>
> Mike
Racking stress. Reinforce with a cleat.
On Mar 4, 10:37=A0pm, Michael <[email protected]> wrote:
> I need to re-glue a dado joint on a bench made of rock maple. It looks li=
ke it was originally glued with yellow wood glue. Even after scraping, I wo=
uld guess that yellow wood glue is not my best option. Any suggestions?
>
> Thanks,
>
> Mike
For a snug-fitting dado which houses the joint on three sides --
not a rabbet -- stress is in shear. Any glue will work fine.
On 3/5/2012 1:07 PM, Michael wrote:
> On Monday, March 5, 2012 4:56:16 AM UTC-6, JayPique wrote:
>> On Sunday, March 4, 2012 10:37:58 PM UTC-5, Michael wrote:
>>> I need to re-glue a dado joint on a bench made of rock maple. It looks like it was originally glued with yellow wood glue. Even after scraping, I would guess that yellow wood glue is not my best option. Any suggestions?
>>>
>>> Thanks,
>>>
>>> Mike
>>
>> If by dado joint you mean you have a cross-grain groove cut into a board into which another board sits with the same grain orientation (like a shelf into a groove in the side of a bookcase) then you have basically zero long grain to long grain gluing surface to begin with. I'd try to figure out why the joint failed in the first place, but my suggestion is that you try to reinforce the joint with biscuits or dowels or even screws and use epoxy.
>> JP
>
> It's end grain to long grain. Two four feet long (1 X 8s) are dadoed into a single vertical flat piece that serves as the sides of the box and the legs. I really can't tell why the joint failed. All the others seem tight and well done.
>
> Mike
Expansion and contraction made the joint fail. Glue one end of the
joint, not the whole length, to allow for expansion and contraction.
JayPique wrote:
> On Sunday, March 4, 2012 10:37:58 PM UTC-5, Michael wrote:
> > I need to re-glue a dado joint on a bench made of rock maple. It
> > looks like it was originally glued with yellow wood glue. Even
> > after scraping, I would guess that yellow wood glue is not my
> > best option. Any suggestions?
> >
> > Thanks,
> >
> > Mike
>
> If by dado joint you mean you have a cross-grain groove cut into a
> board into which another board sits with the same grain orientation
> (like a shelf into a groove in the side of a bookcase) then you
> have basically zero long grain to long grain gluing surface to
> begin with. I'd try to figure out why the joint failed in the
> first place, but my suggestion is that you try to reinforce the
> joint with biscuits or dowels or even screws and use epoxy. JP