Domino Crib Sheet - How do you glue? and other crib sheet topics

[PaulMarcel]

The video was interesting and informative.  I understand your rationale for not putting glue on only the Domino.  However, this is the approach that I most frequently use.  It was demonstrated at the Festool training in Lebanon.  Brian's approach was to squirt glue onto a scrap piece and then smear the domino in the glue and insert into the slot.  The next domino was used to scrape away excess glue and then go into the glue itself.  To your point, this does require some squeeze-out clean up.  However, it is a faster approach overall (in my opinion).  I've not seen any degredation of strength - I suspect this is because of the glue in the domino grooves.  This is just throwing out another consideration, not questioning the results you demonstrated.  The great difference in strength certainly warrants consideration for gluing both.  Thanks.

Based on some comments from a non-FOGger who watched from my channel, I may repeat the experiment with a couple other ways to glue up the Domino.  Since it seems the failure in my experiment was due to the Domino going in dry and smearing away the glue, the thought is to put a little on the bottom third of the Domino (plus everywhere in the mortise) and see if the squeeze-out can be limited or eliminated while getting a good glue-up.  I may do a Domino with your method, too!

 

[PaulMarcel]

I posted the last of the 'crib sheet' series last night.  The idea for the series was to cover fringy topics that are useful to know.  Here's a list of what they cover:

- Screw holding in man-made materials using the Domino

- Preferring the Quick-Height Adjustment and Drawboring Dominos

- Grain and Angles - 4 topics
  topics are:

• grain orientations in traditional mortise & tenon joinery vs Domino joinery
• mortising miters
• best way to accurately set the fence bevel angle
• alternate way to Domino a mitered box corner without setting a bevel on the fence

- Mid-Panel Joinery, Cut-To-Length Stock, Pinning Joints

 

[barnowl]

Paul, I enjoyed watching your videos......but get rid of that durned T-shirt.

Somewhere, some time, I found that Tightbond glue (which I use), stated that the glue thickness needed, need only be ONE MOLECULE thick.

Google it, you'll find it.

The whole secret, is to get that molecule (or more) in place.

 

[Steve R]

Paul, I enjoyed watching your videos......but get rid of that durned T-shirt.

[eek] Does Festool allow topless reviews?!? [scared] Please Paul keep the shirt on!!!! [poke]

Cheers,
Steve

 

[tiralie]

Wish I had a chance to eat at ElBulli before it closed last year. 

Same here. Although I hear Alinea in Chicago is a good substitute and I still would like to eat at any of Keller's restuarants - The French Laundry in Sonoma at the top of my list.

Wish the tomb on his methods wasn't the cost of a Rotex or I'd have had that long ago! But then I'd need room for a liquid nitrogen freezer for pea purée, balloons for aromatic desserts, and a funky Tesla-coil like thing to make string sugar.  It's no wonder the restaurant was open 6 months of the year with the other 6 busy doing R&D!

Like you I was tempted to buy his book, but I am not sure those techniques, and technologies are really practical for a home kitchen. I am good with Sous Vide (cooking vacuum sealed food in a low temperature water bath) but that's as far as I am going in my kitchen.
I make a big enough mess of the kitchen as it is.
Tim

 

[jacko9]

Paul,  Thanks for another excellent video as all of them have been very helpful.  I used your ideas to expand the width of the domino mortise using the cursor marking for a through m&t joint with excellent results.

I do have one question about your testing technique, how many joints are put in pure shear loading like that and is that relevant to overall m&t joint strength in say a rail to leg joint?  I know that the comparison in the test is conclusive but, what does that tell us about furniture joint strength?

Not criticizing, just looking to stimulate thoughts since I use the glue mortise only technique a lot.

PS, my wife says lose the shirt [wink]

 

[PaulMarcel]

Thanks, Jack... I think the glue experiment mostly shows relative strengths of the different methods.  If the glue-in-mortise-only method results in a joint strong enough for your project, then there's no compelling reason to wipe squeeze-out.

In this experiment, the glue was under tension.  I can't think of a joint off hand where it would be purely in tension like that.

I think a second test might be merited with parts glued to a 90º joint much like you'd have in a face frame.  Once glued, lever down the arm and see how the joint holds.  I don't have a way to measure the force applied at the tip unless I go find some luggage scale that remembers a max.  It might be therefore based on "I pulled harder on this one".  In the case of levering down an arm, the glue joint is in sheer.  I'll have to think of ways to make it more scientific and more directly related to real-life joints.

At least in tension, though, world of difference between the joints!

 

[fritter63]

Paul, I think that would be a better method.

And I don't think you'd need to measure force. The reason being is that in all other joint tests,it seems that the surrounding wood always fails first. In which case, the experiment is tainted by the fact that no two pieces of wood are identical. All that would make sense is to run each joint type 30 times (there's that central limit theorem again) and take an average.

However, I'd bet that in this situation, both approaches would still yield a joint that fails in the surrounding wood. Which might mean that it simply doesn't matter.

 

[RONWEN]

Paul,  Thanks for another excellent video as all of them have been very helpful.  I used your ideas to expand the width of the domino mortise using the cursor marking for a through m&t joint with excellent results.

I do have one question about your testing technique, how many joints are put in pure shear loading like that and is that relevant to overall m&t joint strength in say a rail to leg joint?  I know that the comparison in the test is conclusive but, what does that tell us about furniture joint strength?

Not criticizing, just looking to stimulate thoughts since I use the glue mortise only technique a lot.

PS, my wife says lose the shirt [wink]

Else, Add them to your store so your fan club can buy them & look just like Paul Marcel...  [scared]