Larry Jaques wrote:
>
>>By that link to attach a 32" oak face frame to 3/4" ply partition the minimum
>>force needed is 4800 pounds. Roughly the weight of my truck. On one stile of a
>>face frame.
>
>
> That's seems higher, but it's just 200psi. Each clamp is capable
> of exerting many tons of pressure.
Just trying to create the visual of a 4wd teetering on a skinny slat and
partition while the glue set.
And that was the low side of the recommended pressure for hard wood.
> My crank pressure method is thumb and little finger.
Doesn't take much.
--
Mark
N.E. Ohio
Never argue with a fool, a bystander can't tell you apart. (S. Clemens, A.K.A.
Mark Twain)
When in doubt hit the throttle. It may not help but it sure ends the suspense.
(Gaz, r.moto)
In rec.woodworking
"Rich" <[email protected]> wrote:
>When gluing boards together is pressure necessary? In other words HOW much
>should I tighten my pipe clamps?
Yes it is. Each glue has a manufacturer recommended clamping pressure.
Usually is is around 175-250 psi for hardwoods. Read more here:
http://www.titebond.com/IntroPageTB.ASP?UserType=1&ProdSel=ProductCategoryTB.asp?prodcat=1
In rec.woodworking
[email protected] (Bruce) wrote:
>In rec.woodworking
>"Rich" <[email protected]> wrote:
>
>>When gluing boards together is pressure necessary? In other words HOW much
>>should I tighten my pipe clamps?
>
>Yes it is. Each glue has a manufacturer recommended clamping pressure.
>Usually is is around 175-250 psi for hardwoods. Read more here:
>
>http://www.titebond.com/IntroPageTB.ASP?UserType=1&ProdSel=ProductCategoryTB.asp?prodcat=1
I realized I didn't answer your question of "how much" I doubt many have
actually calculated their clamping pressures as that would be a real pain
in the ass to do. You'd have to calculate surface area of the clamped
area, divide by the number of clamps, torque each clamp to a known value
and perform the math to figure out how much linear force is applied by the
screw when twisted with a particular torque.
Hmmmm...
Clamping 2 boards, 1' square how many twist grip bar clamps?
144 square inches so to get 200 psi you need:
200 * 144 = 28,800lbs of total clamp pressure
28,800 / 1000 lbs** per clamp is 29 clamps!! What the hell? Is something
wrong with my math? I'd put about 4-6 clamps on that myself. I think you
better break out the C-Clamps.
**From the Bessey website, 1000 nominal clamping on their heavy bar clamps.
The way I see that, you can figure 1 clamp per 5 square inches.
A vacuum bag only puts out about 14 psi.
We glue with a leak (about 7psi) so as not to
starve the joint for glue.
"Bruce" <[email protected]> wrote in message
news:[email protected]...
> In rec.woodworking
> "Rich" <[email protected]> wrote:
>
> >When gluing boards together is pressure necessary? In other words HOW
much
> >should I tighten my pipe clamps?
>
> Yes it is. Each glue has a manufacturer recommended clamping pressure.
> Usually is is around 175-250 psi for hardwoods. Read more here:
>
>
http://www.titebond.com/IntroPageTB.ASP?UserType=1&ProdSel=ProductCategoryTB.asp?prodcat=1
>
>
>
>
>
>
On Wed, 18 Feb 2004 05:49:09 GMT, Mark <[email protected]>
brought forth from the murky depths:
>Bruce wrote:
>>>http://www.titebond.com/IntroPageTB.ASP?UserType=1&ProdSel=ProductCategoryTB.asp?prodcat=1
>> I realized I didn't answer your question of "how much" I doubt many have
>> actually calculated their clamping pressures as that would be a real pain
>> in the ass to do.
>
>By that link to attach a 32" oak face frame to 3/4" ply partition the minimum
>force needed is 4800 pounds. Roughly the weight of my truck. On one stile of a
>face frame.
That's seems higher, but it's just 200psi. Each clamp is capable
of exerting many tons of pressure. My crank pressure method is
thumb and little finger.
>Somehow I think many here have gotten away with less.
Indubitably. Glue is great stuff.
---=====---
After all else fails, read the instructions.
---=====---
Website Design and Update http://www.diversify.com
"Rich" <[email protected]> wrote in message news:<[email protected]>...
> Great, I am one of the ones who go thought you had to go nuclear on the
> pressure.
If you do that, you practically guarantee a glue-starved joint.
You won't get a feel for it until you do a few glueups, but you want
to apply just enough pressure to get a uniform bead of squeezeout. If
you get the pressure right, once the glue has dried, the clamps will
be slightly loose.
If you have to crank down on the clamps to close the joint, you
need to re-do the joint.
Chuck Vance
I normally just tighten enough to not squeeze out all the glue, but enough
to squeeze out a bit. Don't tighten till the handle stops, but till it gives
good resistance. That's how I do it with Elmer's Yeller glue.
KY
--
http://users.adelphia.net/~kyhighland
"Bruce" <[email protected]> wrote in message
news:[email protected]...
> In rec.woodworking
> [email protected] (Bruce) wrote:
>
> >In rec.woodworking
> >"Rich" <[email protected]> wrote:
> >
> >>When gluing boards together is pressure necessary? In other words HOW
much
> >>should I tighten my pipe clamps?
> >
> >Yes it is. Each glue has a manufacturer recommended clamping pressure.
> >Usually is is around 175-250 psi for hardwoods. Read more here:
> >
>
>http://www.titebond.com/IntroPageTB.ASP?UserType=1&ProdSel=ProductCategoryT
B.asp?prodcat=1
>
> I realized I didn't answer your question of "how much" I doubt many have
> actually calculated their clamping pressures as that would be a real pain
> in the ass to do. You'd have to calculate surface area of the clamped
> area, divide by the number of clamps, torque each clamp to a known value
> and perform the math to figure out how much linear force is applied by the
> screw when twisted with a particular torque.
>
> Hmmmm...
>
> Clamping 2 boards, 1' square how many twist grip bar clamps?
>
> 144 square inches so to get 200 psi you need:
>
> 200 * 144 = 28,800lbs of total clamp pressure
>
> 28,800 / 1000 lbs** per clamp is 29 clamps!! What the hell? Is something
> wrong with my math? I'd put about 4-6 clamps on that myself. I think you
> better break out the C-Clamps.
>
> **From the Bessey website, 1000 nominal clamping on their heavy bar
clamps.
> The way I see that, you can figure 1 clamp per 5 square inches.
>
>
Bruce wrote:
>
>>http://www.titebond.com/IntroPageTB.ASP?UserType=1&ProdSel=ProductCategoryTB.asp?prodcat=1
>
>
> I realized I didn't answer your question of "how much" I doubt many have
> actually calculated their clamping pressures as that would be a real pain
> in the ass to do.
By that link to attach a 32" oak face frame to 3/4" ply partition the minimum
force needed is 4800 pounds. Roughly the weight of my truck. On one stile of a
face frame.
Somehow I think many here have gotten away with less.
--
Mark
N.E. Ohio
Never argue with a fool, a bystander can't tell you apart. (S. Clemens, A.K.A.
Mark Twain)
When in doubt hit the throttle. It may not help but it sure ends the suspense.
(Gaz, r.moto)
On Wed, 18 Feb 2004 04:01:15 GMT, "Rich" <[email protected]>
wrote:
>Great, I am one of the ones who go thought you had to go nuclear on the
>pressure.
>
>Again I applaud the fast responses
>Thanks again
>Rich
>
clamp the boards together with enough pressure for moderate glue
"squeeze-out"...no more. It's not advantagious to apply excessive
pressure during a glue up. The mathematician and his calcs. are OT in
this room.
The simple answer would be tight enough that the pieces do not slip apart
from each other while the glue dries. Snug but not real tight.
"Rich" <[email protected]> wrote in message
news:[email protected]...
> When gluing boards together is pressure necessary? In other words HOW much
> should I tighten my pipe clamps?
>
> Rich
> I know this question sounds dumb to you guys but hey I'm just learning
>
>
>