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Author Topic: Gluing Dominos - Standard Operating Procedure  (Read 681 times)

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Offline fshanno

  • Posts: 1053
Gluing Dominos - Standard Operating Procedure
« on: July 30, 2021, 02:22 AM »
Dear Festool,

What's the best/suggested/standard method for applying glue when using Domino tenons?  What's bad practice?  What's good practice?  What's terrible practice?  What are the best/recommended tools or devices for applying glue?  Do you offer any devices for applying glue?

Let's say for all the standard sizes for the DF 500.  After all, it's your product, if you don't know who would?

Thanx in advance!
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Offline Birdhunter

  • Posts: 3545
  • Woodworker, Sportsman, Retired
Re: Gluing Dominos - Standard Operating Procedure
« Reply #1 on: July 30, 2021, 03:23 PM »
Not Festool here, just a long time Domino user.

I use a solder brush that I trim short to apply a thin cost of TB III to the tenon. If I am joining oily woods, I swab out the mortise with alcohol before glueing. Also, swab both sides of the joint. I use alcohol with no oil in it. Some use naphtha.

I don’t like squeeze out glue contaminating the wood so I apply the glue sparingly. I’ve never had a joint fail due to too little glue.

Too much glue and you get gobs of glue outside the joint line. Messy.

Way too much glue and the tenon may either not go in all the way or may rupture the wood if use use too much hammer modulation.
Birdhunter

Offline Crazyraceguy

  • Posts: 685
Re: Gluing Dominos - Standard Operating Procedure
« Reply #2 on: August 02, 2021, 06:36 PM »
It depends upon the intended use of the Domino.
If you are just using them for alignment of the boards in a panel glue-up, then putting  glue on the Dominos is not necessary. The glue alone on a long grain to long grain joint is stronger than the wood itself, so gluing the dominos does not help and it may even make the joint harder to assemble.
Using Dominos on joints like joining table legs to aprons is a totally different thing. This is an end grain to long grain joint, which is not nearly as strong. End grain does not glue well. The mechanical joinery of the Dominos adds to the joint by adding long grain connection and glue surfaces. The glue is doing something in this case, so the Dominos need to be well slathered. You need them coated but not swimming in glue. Too much glue introduces hydraulic forces which can push the joint back apart or even rupture the wood. The glue is looking for a way out and it will find one and it is not good. You get squeeze-out or split something and it takes too much force to assemble.

If I need glue on the Domino, I put some down in the slot and smear it around with a brush or thin stick, on smaller sizes that is good enough. Then tap the Domino in and it will force the extra up from the bottom of the hole. This is the tight side. One the other side, you can apply a bit more glue, because the wider slot will give it a space to go into.
On the bigger sized Dominos, I may brush a bit more on the Domino after tapping it into the hole, but don't go crazy with that. Dominos fit the mortices very well, so a lot of glue on the sides of the Dominos just gets scraped off as it enters, so you are back to a bunch of squeeze out.
CSX
DF500 + assortment set
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OF1400
MFK700 (2)
TS55, FS1080, FS1400 holey, FS1900, FS3000
CT26E + Workshop cleaning set
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ETS EC 125
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Offline Lincoln

  • Posts: 152
Re: Gluing Dominos - Standard Operating Procedure
« Reply #3 on: August 03, 2021, 06:10 PM »
I really like the silicone glue brushes that Rockler, and others, sell. They have a flat paddle on one end that is the perfect size for the mortises.

Offline Crazyraceguy

  • Posts: 685
Re: Gluing Dominos - Standard Operating Procedure
« Reply #4 on: August 03, 2021, 06:42 PM »
I really like the silicone glue brushes that Rockler, and others, sell. They have a flat paddle on one end that is the perfect size for the mortises.

Yeah, me too. It works great except for the tiny 4mm ones.
CSX
DF500 + assortment set
PS420 + Base kit
OF1010
OF1400
MFK700 (2)
TS55, FS1080, FS1400 holey, FS1900, FS3000
CT26E + Workshop cleaning set
RO90
RO125
ETS EC 125
RAS115
ETS 125 (2)
TS75
Shaper Origin/Workstation