Using a Domino Slot to Hold a Domino-Shaped Nut

[Tim Brennan]

I have seen on a Trip Trap chair that a 6mm slot just like the one made by a domino is used to hold a domino shaped nut. This then allows the screws to make very strong joins with no wobbling.

https://imgur.com/a/uQZwIS4

I wanted to use these screws on some plywood furniture I am designing and found them online for £22 for 6.

https://www.stokke.com/en-my/spare-parts/107600.html?cgid=20439

So, looking for a more reasonably priced alternative, I googled for ages but wasn't able to find anything similar.

Anyone have any suggestions for alternative fixings that will provide that kind of high clamping force with the ability to disassemble and reassemble many times? (I am using 18mm ply)

 

[Paul_HKI]

Flat bar stock, a drill, thread tap and a hacksaw is what I'd be looking at.

Mark out centreline in suitable sized bar stock (my domino's aren't here to check), centre punch at suitable distances, drill and tap a row of holes, then cut into pieces.

 

[Cheese]

This is similar to what Paul was talking about.

Some 10mm x 20mm aluminum barstock, the countersinks are to key the "Domino" into the epoxy adhesive, a hole drilled & tapped on the other end for a fastener.

[attachimg=1]

[attachimg=2]

 

[guybo]

https://www.ratrig.com/openbuilds-tee-nut-1-unit.html maybe?

 

[Michael Kellough]

https://www.ratrig.com/openbuilds-tee-nut-1-unit.html maybe?

I was about to post this link to weld nuts, which are about the same thing and surely the lowest cost readymade fastener.

weld nuts at McMaster.com

 

[guybo]

I love this it's like one of theses never ending [big grin]

 

[Michael Kellough]

If you want use the Domino nut as a decorative element and a fastener as in the picture you provided then you need to add a nut to the Domino.

If you only need a small number you can add a T-nut to the Domino. It would take some careful work with a drill press (aka a pillar drill?) to counterbore the Domino so the T-nut is flush with the surface.

This one is stainless steel and needs only a small amount of grinding to fit into a 6mm Domino. It's for a 6mm screw so if a smaller screw works a smaller T-nut might be less work to fit.

 

[Michael Kellough]

I love this it's like one of theses never ending [big grin]

Where did that come from?!

That is my wife's interpretation of the old idea.

 

[Tim Brennan]

Some very interesting solutions here. Thanks everyone.

I just had an idea to 3D print a domino with a rectangular cavity to insert a square nut like these… https://www.amazon.co.uk/dp/B08DMNSJDW/ref=cm_sw_em_r_mt_dp_F0SZ2KFY2EZ2GN9Q364X

 

[Michael Kellough]

Can the plastic the printer uses withstand the pressure from tightening without getting loose?

 

[Tim Brennan]

Can the plastic the printer uses withstand the pressure from tightening without getting loose?

Thats a good point and it depends on the infill (the printer makes a shell of plastic and then fills internally with a latice structure. More infill makes the part stronger but takes longer to print.

To get around that I will make the nut flush with the top of the printed domino and then remember to have that side facing the screw head. That way the plastic will not be under any load.

I am just doing the CAD now. Happy to share if anyone wants it.

 

[rmwarren]

I may be missing something but isn't [member=21939]TBR[/member] just looking for barrel nuts with a flat head furniture screw?

Furniture Fasteners

Substitute a round hole for the Domino slot.

RMW