I don't recommend using Loctite its not really for that usage as Bruce said better to use industrial Super Glue or Double Sided Tape, if its heavy machining I would prefer soft solder if possible, I have had glue when warm let go.

Stan

I am in the process of fitting a key to the base of my big machine vice for quick location in the table slots. I milled a 1/2" slot in the vice base to give a close fit on a bit of 1/2" BMS square, then used Loctite high temp fixing stuff to lock the bar into the slot to drill matching holes. Worked a treat, after drilling the bar could be knocked out with a drift quite easily. Of course in this application the sides of the slot constrained the bar sideways so the Loctite wouldn't need to work that hard.

I have found previously that if I Loctite something in a through hole and place the whole item on a flat surface to cure and some of the stuff leaks through the hole, it does fix quite firmly to the surface but the bond can easily be broken. I'd say give it a whirl – maybe on a test piece first.

Problem with superglue is that it does fix fast, only way to break the bond can be to apply heat, the whole assembly may need to be got quite hot, and the fumes are very nasty.

If the surfaces are nice and flat, another option I've been trying recently with some clock parts is shellac, in the form of carpenter's knotting. You need to apply quite a lot to fill between the items, then leave it somewhere to dry, preferably a hot surface like a storage heater. This can hold well once set and cold, to release get it quite hot again, around 80 – 100 C, when the shellac softens. In one case I boiled the items! Knotting comes in quite large bottles, is cheap, lasts for ever, and safer than superglue. Get it off with meths.

They do a large range of super glues. I'm fond of the thixotropic grades. Also grades for gluing specific substances together. As they seem to me to often work a lot more effectively than some that are about and come in fair sized bottles I'm not sure they are that expensive really.

John

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John,

I almost wrote your words last night, but then realised that the original post does mention 641. So I decided to just 'observe'.

That said … the thread has drifted into the usual ambiguity, and yours is a very timely 'wake-up'

MichaelG

Edited By Michael Gilligan on 02/03/2016 16:33:12

I would imagine most double sided tapes wouldn't have enough "tack" to withstand the twisting effect of drilling without more support.

Michael W

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I recently tacked some parts together so that I could machine them as pairs. – The material was aluminium and I found super glue was a good bond with this.

I also used super glue for bonding a steam chest, it's lid and the cylinder together for drilling before I had a DRO on my mill to be assured of all 3 matching.

Double sided tape is I know used when turning thin material on a lathe faceplate. As far as I am aware the strength of the bond while machining is not the problem. Getting the bond to break and get the thin part off without bending it may however be so.

Nick