Superglue for holding workpieces

[pgk pgkParticipant @pgkpgk17461]

Posted by Ian S C on 19/05/2018 12:35:00:

In my wood turning days I would attach a wooden disc to a face plate, put some PVA glue on that, then a piece of paper(I used pages from an old phone book), then more glue, then the piece of wood I was going to make a bowl from. Next day it was ready to turn. When finished, a tap on a chisel at the joint and the paper split in two. Metal would need a different glue.

Ian S C

I'd watched videos of that when i went through a sawdust creation phase and decided to try it. My first attempt ended up with a lucky escape as a large spinnig chunk of timber flew past my ear.. I don't know what went wrong but it put me off trying again.

pgk

[Ian S CParticipant @iansc]

pgk, you must have been unlucky with that one, or to put it another way lucky it didn't clobber you. One thing I did do was put a small tack in the centre of the block on the face plate, then a little hole in the work piece to line them up, then clamp them over night. Use good quality PVA.

Ian S C

[Neil LickfoldParticipant @neillickfold44316]

Posted by Eric Cox on 19/05/2018 10:00:58:

Having watched the video, all the super glue does is bond two pieces of tape together. The adhesive strength of the tape is what holds the Aluminium.Surely a large piece of double sided tape will do the job without the need for super glue.

I was thinking the same Eric. But after looking more closely, I noticed that the the tape does wrap around the sides for both the fixed block and the work piece. The function of wrapping around the corner does give it a lot holding power over just the double sided tape. Did a small test just using the Blue paint tape. Maybe the double sided tape was not as grunty as it could have been but the tape and super glue did hold a lot better. The other thing was, I used a scotchbrite pad to clean the surfaces of the fixed block and the workpiece, then the IPA . This made a really big difference in the ability of the tape to stick to the Ali test pieces. This cleaning also helped with the double sided tape. Maybe if i had a bigger test piece, the results of the double sided tape may have been better.

Does anyone know of any low melting plastics that could be used to cast around a part to create support and can be removed or softened in boiling water?

Neil

[I.M. OUTAHEREParticipant @i-m-outahere]

Polymorph pellets , do a search on the net and you will see what they are .

[Neil LickfoldParticipant @neillickfold44316]

Thanks for that .

[John HaineParticipant @johnhaine32865]

Coming back to my question, does anyone know the correct type number or other specified for the kind of tape that Neil mentioned please?

[Neil LickfoldParticipant @neillickfold44316]

Posted by John Haine on 20/05/2018 09:46:28:

Coming back to my question, does anyone know the correct type number or other specified for the kind of tape that Neil mentioned please?

Super Glue Fixturing for CNC Machining!

If you follow the link about 1/2 way down the page, he has a shopping list of the two types of tape that they recommend and the best super glues they have found. I can get the super glue he uses in the video as Loctite is sold here. For my test, I just used the Blue painters tape from 3M from the paint department from Bunnings, a home building supply company. Cleaning the surface with IPA  Isopropyl alcohol really made the tape stick quite well.

Neil

Edited By Neil Lickfold on 20/05/2018 10:41:08

[John HaineParticipant @johnhaine32865]

OK, thanks Neil. Being in B&Q (an equivalent to Homebase that Bunnings own over here) I found they had blue painter's tape so bought a reel, will give it a go.

I think the advantage of using the tape rather than just sticking metal plates with superglue is that actually you can get it apart more easily! I can imagine that a small metal part could get bent prising the glue apart.

Another thing you could try, from clockmaking, is shellac as I mentioned above. I've had mixed success as I don't have proper shellac flakes so have only been able to experiment with knotting, not so good. But I understand that that the proper way to do it is to melt shellac flakes on one part and spread them around, then apply the other part (hot) position them carefully and press together and allow to cool. Just heat to melt again and take apart.

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