So, my first major glue up didn't go exactly how it should have. I
glued 7 boards of cherry together to make a 40" x 68" (x 3/4" actual)
table top. But half way through the glue up I realized I should have
used a slow acting glue. In my rush I must have tightened up the
clamps too tight (or made some mistakes with the jointer). Anyway,
now I have a slightly cupped table top. Any suggestions for
flattening out the table top?
Thanks!
> Will your table have an apron? Clamp it down to the apron and attach with
> screws in elongated slotted holes. Over clamping can cause the clamp bars
> to bend and especially on wider glue ups. You need only clamp tightly
> enough to squeeze out a trace of glue along the joints.
Can you elaborate on the elongated slotted holes? The table will have
a 4" apron with hepplewhite legs.
Oh, all the things you learn after you've spent all the money, and
energy. What fun being a new woodworker!
Thanks!
jeb
[email protected] (Jeb Sawyer) wrote in message news:<[email protected]>...
> So, my first major glue up didn't go exactly how it should have. I
> glued 7 boards of cherry together to make a 40" x 68" (x 3/4" actual)
> table top. But half way through the glue up I realized I should have
> used a slow acting glue. In my rush I must have tightened up the
> clamps too tight (or made some mistakes with the jointer). Anyway,
> now I have a slightly cupped table top. Any suggestions for
> flattening out the table top?
> Thanks!
I looked at the glue up again and there may be more cup than I
previously thought. I'm reluctant to cut it apart because of some
significant snipe problem with my jointer. I'm wondering If I
sandwich the tabletop between 2 4x8 panels of 3/4" MDF (with the arc
up) and rested my Ford Ranger on top of it for a couple of days, if
that would flatten it enough that i can use the elongated screws.
Anyone have any experience with vehicles for weight? Is this just
ridiculous? I thought of using cinderblocks, but don't think there
would be enough weight. Is there a chance of the glue-up breaking (I
did use biscuits).
Maybe my Corolla would be a better choice.
Good lord, why didn't somebody tell me _THIS_ about woodworking.
Thanks,
Jeb
"Mike Hide" <[email protected]> wrote in message news:<aWzVa.12291
> So why did you ask for suggestions ???
I asked for suggestions because I'm still trying to find a feasible
method of fixing the cupped table and I had previously underestimated
how large the cup is. So, I must first figure out how to get the cup
down to something feasible to use the suggestions for. I have really
appreciated all of the suggestions, but from my estimation they won't
work in the first phase because:
1) Ripping along the joints - would love to use this method but my
jointer has serious snipe problems which would decrease the overall
width of the table by about 5". Unfortunately, the place my wife is
planning on putting the desk needs to be at least 68".
2) Time Saver - Glue up is _too_ cupped to be effective
3) Planing - Once again, too cupped.
The elongated screw holes will probably used in the second phase of
fixing this disaster.
-jeb
There ia simple solution, put in he back of your pickup /suv/truck/station
wagon ,take it down to your local mill shop, one of those that has been
there forever and does whole house jobs .see the shop forman and ask him to
run it through a 48" timesaver [belt sander] . They know you are a
woodworker and no threat to them and most formen work with wood because they
like it . Might cost a sixpack or perhaps a few bucks and chalk it up to
experience.
Next time just do a couple of boards at a time and let them dry of edge ,ie
both side exposed to the same conditions . After gluing let it alone for a
couple of days ,then do a couple more using the same procedure .Doing it
this way correcting a couple of boards is doable . Then start gluing up the
pairs of preglued boards ,again making sure you have air to both sides .You
still might run into some problems, but probably nohing you cannot handle .
keep the top until you are ready to install with air to both sides and when
you finish it do the same to both sides, ie same finish and same number of
coats ....mjh
--
mike hide
http://members.tripod.com/mikehide2
"Jeb Sawyer" <[email protected]> wrote in message
news:[email protected]...
> So, my first major glue up didn't go exactly how it should have. I
> glued 7 boards of cherry together to make a 40" x 68" (x 3/4" actual)
> table top. But half way through the glue up I realized I should have
> used a slow acting glue. In my rush I must have tightened up the
> clamps too tight (or made some mistakes with the jointer). Anyway,
> now I have a slightly cupped table top. Any suggestions for
> flattening out the table top?
> Thanks!
In article <[email protected]>,
[email protected] says...
> Anyway,
> now I have a slightly cupped table top. Any suggestions for
> flattening out the table top?
>
>
Don't be afraid of actually ripping the top apart on the table saw along
the joint lines and doing it over. As long as you can spare the loss of
a little width, you'll be much happier.
Kim
So why did you ask for suggestions ???
--
mike hide
http://members.tripod.com/mikehide2
"Jeb Sawyer" <[email protected]> wrote in message
news:[email protected]...
> [email protected] (Jeb Sawyer) wrote in message
news:<[email protected]>...
> > So, my first major glue up didn't go exactly how it should have. I
> > glued 7 boards of cherry together to make a 40" x 68" (x 3/4" actual)
> > table top. But half way through the glue up I realized I should have
> > used a slow acting glue. In my rush I must have tightened up the
> > clamps too tight (or made some mistakes with the jointer). Anyway,
> > now I have a slightly cupped table top. Any suggestions for
> > flattening out the table top?
> > Thanks!
>
> I looked at the glue up again and there may be more cup than I
> previously thought. I'm reluctant to cut it apart because of some
> significant snipe problem with my jointer. I'm wondering If I
> sandwich the tabletop between 2 4x8 panels of 3/4" MDF (with the arc
> up) and rested my Ford Ranger on top of it for a couple of days, if
> that would flatten it enough that i can use the elongated screws.
>
> Anyone have any experience with vehicles for weight? Is this just
> ridiculous? I thought of using cinderblocks, but don't think there
> would be enough weight. Is there a chance of the glue-up breaking (I
> did use biscuits).
>
> Maybe my Corolla would be a better choice.
>
> Good lord, why didn't somebody tell me _THIS_ about woodworking.
>
> Thanks,
> Jeb
Jeb:
A number of good suggestions so far--here's one that's a bit tougher. If the
cup is small, say 1/8" or less, and you don't mind a little effort, and the
top can stand to be a bit thinner, you might hand plane it. Start with a
number 5 and move to a number 7 to smooth. Plane the center of the convex
side first, then the edges of the concave side. Plane across the grain
first, then along the grain to smooth. Scrape or sand as needed. Yeah, it's
work, but if a beginner like me can do it, so can you. I flattened a pine
table top nearly as large as yours to within a few thousands using this
method.
Bob Schmall
"Jeb Sawyer" <[email protected]> wrote in message
news:[email protected]...
> So, my first major glue up didn't go exactly how it should have. I
> glued 7 boards of cherry together to make a 40" x 68" (x 3/4" actual)
> table top. But half way through the glue up I realized I should have
> used a slow acting glue. In my rush I must have tightened up the
> clamps too tight (or made some mistakes with the jointer). Anyway,
> now I have a slightly cupped table top. Any suggestions for
> flattening out the table top?
> Thanks!