Thread: How well will CA prevent small screws from working loose in a scissor action piece?

How about just using brass rod from the K&S rack at a hobby shop as a full rivet? Just peen both ends into a countersink in the timber arms with a brass washer between the arms.


Screwing up in new ways every day

If you go down the screw in wood avenue, my Loctite Chart suggests "Super glue gel control". It can be used to fasten metal to wood so it should lock your screw in the wood.

While I really like the idea of using brass rod that way, it's not something I've ever tried before on this small a scale and by my calculations there'll be 42 of these pivot points...

...which in my shed means 42 possible 'implementation failures'

The Rose Mahogany I'm using is gleaned out of off-cuts from another project and I don't really have the option to source more in a hurry if I screw up trying to remove a failed attempt.

Perhaps I should spend a day or two practising on some pine trellis first?

I understand your reluctance, but give it a go on some scrap to develop your technique first. Trellis sounds exactly the right stuff for POC (proof of concept).
I find riveting easier than using screws because they don't rely on glue and they don't force the wood fibres apart (which can lead to splitting - DAMHIK). But to each his own.


Screwing up in new ways every day

How about using a short length of brass tube as the pivot pin and glue brass or copper rivets into each end of the tube to stop the wood from slipping off. You could also add washers, one behind each rivet head and a third one between the two pieces of timber. Brass tube is available from most model shops and rivets come up on flea-bay quite often.

I think screws and relying on glue will come back to annoy you one day.
Ive had a look at some originals, a rivet like they have in them could be done using a brass pin , which has a head , you could drill a hole in a block of steel , if you have a drill press, drop the pins in one at a time and peen out the head wider and flatter if you like .
For the other side you will need a washer with a hole the same size as the pin shaft .
This can be done with a brass sheet and a punch and a block of steel with a matching hole. punch the washers through the hole with the punch, you'd probably only need .5mm sheet brass , posted from George white in Clayton Vic . The tricky bit would be drilling the hole in the middle, One at a time on a drill press is all I can think of . A metal expert like a jeweler would be the guy to ask on the punching and drilling .
Nice little project BTW
Rob

So... the consensus is to persevere with looking for some form of rivet/double-sided fastener then?

We all seem to agree that screw'n'glue has inherent problems.

Originally Posted by woodPixel

What about some little bolts like these that lock at a distance.... maybe with a washer?

Attachment 388420

Binding screws, buy 100 for $15 in a dozen different widths and lengths. 100pcs/lot M5*10 Copper plating Photo album screw Books butt screw Account books screw book binding screw-in Screws from Home Improvement on Aliexpress.com | Alibaba Group

Attachment 388431

I used those on a Fibonacci Gauge (proportional divider-like tool) and also on a Figure-8 caliper. Materials similar to the OP arms. With proper length, they cinch tight but still permit rotation.

Cheers,
Joe

How about these Skew?
https://www.thewoodworks.com.au/shop...10-sets-detail

I've used those brass binding screws (Chicago screws) successfully. I put a bit of Loctite on the thread once they are all correctly positioned.

A fine example of 'Ask and you shall receive.'

The cutlers rivets were exactly what I was looking for, but with the price on those chicago screws... I have to give them a go.

Thanks fellas, you've made my day!

Two thoughts here.
1 ~ TiteBond-III on the threads of a wood screw. I've had Kreg screws snap when trying to remove them after the TB-III cured.
2 ~ A machine screw, 3 washers and a nut. Secure the nut with Loctite Red. Use a Dremel with a cutting wheel to trim the screw flush with the machine screw.