Glue du jour

[Bob Unitt 1Participant @bobunitt1]

asking about glue for steel

[Bob Unitt 1Participant @bobunitt1]

I have to stick a 1/4 silver steel pin into a 1/4 reamed hole in mild steel, what's the best glue for that these days ?

[Mick B1Participant @mickb1]

Size to size is an interference fit. The best adhesive would be an anaerobic – maybe Loctite 271?

Depending on the force(s) the joint has to withstand, it might help to knurl up the silver steel a bit for a more severe graunch fit, then force assembly with a vice or suchlike. Or perhaps silver solder if the pin's not hardened.

Edited By Mick B1 on 21/01/2020 17:24:29

[EmgeeParticipant @emgee]

Bob

As the pin is likely to be undersize and the reamed hole oversize if you don't knurl the pin as suggested you will have to provide means to keep the pin square with the plate while the Loctite or glue you use cures.
If using a tapered nose hand reamer you could leave part of the hole slightly undersize to give the pin support.

Emgee

[Bob Unitt 1Participant @bobunitt1]

Thanks folks. I've already reamed the holes, and the pins are from 1/4" stock. The parts aren't heavily stressed anyway, they're just the locating pins on the Worden's Woodworker's Grinding Attachment. I'll see if I can find the Loctite locally (I'm a bit out in the sticks here, so I expect it will be mail-order in the end). I probably have some old Loctite knocking around here, but it would have been bought in the 20th century…

[Jeff DaymanParticipant @jeffdayman43397]

one old trick that works to retain pins in holes is to gently peen over the edge of the hole (a little) on one side to start. Peen only on the opposite end you want to install the pin in. The peened area will give a little friction to hold the pin but still allow disassembly if needed.

[Mick B1Participant @mickb1]

Posted by Bob Unitt 1 on 21/01/2020 18:55:36:

Thanks folks. I've already reamed the holes, and the pins are from 1/4" stock. The parts aren't heavily stressed anyway, they're just the locating pins on the Worden's Woodworker's Grinding Attachment. I'll see if I can find the Loctite locally (I'm a bit out in the sticks here, so I expect it will be mail-order in the end). I probably have some old Loctite knocking around here, but it would have been bought in the 20th century…

I only suggested 271 'cos I used it to fix the crankpin in my Stuart 10V back in about '95, plus a few other things and they were all very sound. So mine's from last century too. There may be other grades as good or better.

If the pin's silver steel it's likely to be accurate to size within a tenth or so. If the reamer's an H7 fit it could be potentially max about 5 tenths undersize, though any eccentricity of hold – or almost any other variable – will tend to open it up. That's why I was basing on a size and size fit, but that could obviously be at variance with your particular facts.

[John OlsenParticipant @johnolsen79199]

My understanding is that if Loctite is still runny, it is still good. So if you can still get it out of the bottle it should be OK. (Maybe not if you are working on life critical stuff! )

It can go off in the bottle, especially if you do things like clearing the nozzle with a metal pin. Metal ions will catalyze the reaction.

John

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