Hot glue for magnet to 20mm conduit clip

[burto51]

Hi, Have tried unsuccessfully to hot glue a rectangular magnet to the conduit clip, without much success. At first was using bosses craft glue gun and the glue she had, but no success.

In fact, the 4 magnets/clips evenly spaced along a 1200mm piece of conduit fixed to the bottom of a clean gutter would not hold, at first OK then one of the clips would slowly peel away from the magnet and the lot comes down. Leaving 3 magnets attached to the gutter and the clips on the conduit on terra ferma.

So bought a De Walt hot glue gun and some new glue sticks (Stanley 12mm) and repeated the process. still failure.

Any suggestions have tried roughing the magnet with a bastard file, heating the magnet before glueing; these magnets are from the big chinese superstore so maybe thats the problem.

Burto

 

[Katekate]

get magnets with screw holes

 

[Mark_M]

Some sort of contact adhesive work? Or two part epoxy?

heating the magnet before glueing;

Heating magnets degrade their strength. Up to 50*c from outdoors is fine, but not burning hot with a heat gun.

 

[LagoonLights]

Have a look at the rare earth-threaded magnets: I use them for many things around the house.

Similar to what they sell here.

Threaded

These magnets feature a tapped thread in the centre, allowing you to easily attach the magnet to your design (or vice versa).

aussiemagnets.com.au

 

[Katekate]

I get the ones with holes in the center. either you put a screw through them, or you can ooze hotglue or epoxy through the hole for a better mechanical hold.

 

[Freman]

Sikkaflex is how I stuck magnets to my carport batton lights when epoxy let go on me due to the heat.

 

[burto51]

Thanks all, will look at threading the ones I have, 19x10x5 should be ok and not a great distance to thread. Then look at further possibilities.
We do not have a problem but an opportunity for a solution

Burto

 

[Clegg]

Last year's experiments with magnets drove me nuts, but I found a combination that worked for two use cases.

For the 20mm conduit which worked around the bottom half of my garage with zip-tied LED strip, I used the 20mm Conduit Mounting Clips (https://www.bunnings.com.au/deta-20mm-conduit-mounting-clip-2-pack_p4330822). Last year, Bunnings sold 'tins' of Arlec 16mm and 25mm magnets - worked out really good value, they don't stock them this year so you have to buy them separately now.

For my vertically run conduit. These were 16mm Arlec Magnets with the hook removed (https://www.bunnings.com.au/arlec-16mm-black-magnetic-gutter-hooks-10-pack_p0079001), and M4 Screws I was using for my power supplies (https://www.thefastenerfactory.com.au/stainless-steel-pan-phil-machine-screw-m4-x-10mm-100pc). I purchased oversized washers (possibly these - I eyeballed these - https://www.bunnings.com.au/zenith-3-8-zinc-plated-mudguard-washer-10-pack_p2420299) and hot-glued them to the brick (they held up during December, and have been easy to remove with a scraper and heat gun afterwards.

For my horizontal run across the garage door, I have a metal beam there. I'm pretty sure I used the 25mm magnets for that one (I can't find where I've put them - https://www.bunnings.com.au/arlec-25mm-black-magnetic-gutter-hooks-5-pack_p0079002). Those used M5 screws, so I'm sure I just picked up some M5 10mm bolts. I remember it being a super snug fit though as the ones I bought the heads were perhaps 1mm too wide. Nothing a bit of force didn't fix so they'd sit flush enough.

We were still in 'lockdown' last year when I was trying to work out how to mount my gutter LED strips so I was fairly limited into what I could purchase. I had ordered the IP68 LED strips from Ray Wu (silicon tube), and needed to seat them in something. After a bit of a hunt - and wanting a thinner profile, I thought I'd order some cable channel from 4cabling (https://www.4cabling.com.au/cable-ducting-16mm-w-x-16mm-h-x-2m-white.html - was a bit cheaper last year though - from memory about $5 - but there was free shipping after a threshold that worked out significantly cheaper than Bunnings). Anyway, when I started installing the LED strip, it was a bit 'eh'... until I thought - why not just use the lids. Sure enough, the covers themselves turned out to be perfect. The silicon tubing wedged perfectly in the lid, and the 2m length didn't bother me as I'd need to install magnets. Attempts to hot-glue some magnets I had bought off eBay failed spectacularly - but after success with the magnetic hooks, I figured I'd 3D print some holders for the 16mm magnets at various sizes to hold them in place. It absolutely worked and things stayed in place for the couple of months. These were 16mm magnets, so the same M4 screws in the back held them in place. In hindsight, I could have probably painted the 3D prints to blend in more, but yeah - they looked fantastic.

Bottom line, I found hot glue eventually worked well for the washers to brick, rather than trying to hot glue magnets directly to anything.

Edit: I incorrectly mentioned M5 100mm bolts when I meant 10mm ones.

 

[David_AVD]

Hot melt glue is never going to work, especially in our heat.

Use some Gorilla glue like these:

Gorilla 59ml Glue Bottle - 59ml

Find Gorilla 59ml Glue Bottle - 59ml at Bunnings. Visit your local store for the widest range of products.

www.bunnings.com.au

Gorilla Glue 51ml Clear Bottle

Find Gorilla Glue 51ml Clear Bottle at Bunnings. Visit your local store for the widest range of products.

www.bunnings.com.au

 

[The Hobo]

Last year's experiments with magnets drove me nuts, but I found a combination that worked for two use cases.

For the 20mm conduit which worked around the bottom half of my garage with zip-tied LED strip, I used the 20mm Conduit Mounting Clips (https://www.bunnings.com.au/deta-20mm-conduit-mounting-clip-2-pack_p4330822). Last year, Bunnings sold 'tins' of Arlec 16mm and 25mm magnets - worked out really good value, they don't stock them this year so you have to buy them separately now.

For my vertically run conduit. These were 16mm Arlec Magnets with the hook removed (https://www.bunnings.com.au/arlec-16mm-black-magnetic-gutter-hooks-10-pack_p0079001), and M4 Screws I was using for my power supplies (https://www.thefastenerfactory.com.au/stainless-steel-pan-phil-machine-screw-m4-x-10mm-100pc). I purchased oversized washers (possibly these - I eyeballed these - https://www.bunnings.com.au/zenith-3-8-zinc-plated-mudguard-washer-10-pack_p2420299) and hot-glued them to the brick (they held up during December, and have been easy to remove with a scraper and heat gun afterwards.

For my horizontal run across the garage door, I have a metal beam there. I'm pretty sure I used the 25mm magnets for that one (I can't find where I've put them - https://www.bunnings.com.au/arlec-25mm-black-magnetic-gutter-hooks-5-pack_p0079002). Those used M5 screws, so I'm sure I just picked up some M5 100mm bolts. I remember it being a super snug fit though as the ones I bought the heads were perhaps 1mm too wide. Nothing a bit of force didn't fix so they'd sit flush enough.

We were still in 'lockdown' last year when I was trying to work out how to mount my gutter LED strips so I was fairly limited into what I could purchase. I had ordered the IP68 LED strips from Ray Wu (silicon tube), and needed to seat them in something. After a bit of a hunt - and wanting a thinner profile, I thought I'd order some cable channel from 4cabling (https://www.4cabling.com.au/cable-ducting-16mm-w-x-16mm-h-x-2m-white.html - was a bit cheaper last year though - from memory about $5 - but there was free shipping after a threshold that worked out significantly cheaper than Bunnings). Anyway, when I started installing the LED strip, it was a bit 'eh'... until I thought - why not just use the lids. Sure enough, the covers themselves turned out to be perfect. The silicon tubing wedged perfectly in the lid, and the 2m length didn't bother me as I'd need to install magnets. Attempts to hot-glue some magnets I had bought off eBay failed spectacularly - but after success with the magnetic hooks, I figured I'd 3D print some holders for the 16mm magnets at various sizes to hold them in place. It absolutely worked and things stayed in place for the couple of months. These were 16mm magnets, so the same M4 screws in the back held them in place. In hindsight, I could have probably painted the 3D prints to blend in more, but yeah - they looked fantastic.

Bottom line, I found hot glue eventually worked well for the washers to brick, rather than trying to hot glue magnets directly to anything.

This is great! Love the 3d printed holders - do you have the STL for them please?

I assume the magnets screw in to these holders, and you have used them in 2m intervals? Did you use anything to attach the ducting to the 3d print, or is it well held?

 

[Clegg]

This is great! Love the 3d printed holders - do you have the STL for them please?

I assume the magnets screw in to these holders, and you have used them in 2m intervals? Did you use anything to attach the ducting to the 3d print, or is it well held?

Certainly - I've attached the STL's used last year and the SketchUp Make 2017 file (the last free version of that software that I use with the STL Export plugin).

My printer is a Da Vinci Pro 1.0a and filament is ABS from 3DFillies (https://3dfillies.com/abs-filament-175mm-1kg/), printed on a 3mm glass bed and 3DLac for adhesion. As for the print settings themselves, I'm tweaking it all the time to be useful. As with most printers, there's some quirks that have been factored into my models to work for me (so the holes there I think are 16.5mm to cater for tolerances. I can't remember if I went 100%, 50% or 25% Gyroid infill. I printed all of them at once though over some 24 hours using a fair chunk of plastic. I guess I was factoring in a lot, as the timestamp on these files was 07/11/2021 - couldn't really afford any more 'mistakes' .

With some gloves, patience and a jar full of four letter words - they were friction fit and weren't going anywhere without breaking the plastic. I could have probably made them 0.2mm wider for an easier fit, but then they'd be a bit looser.

I used the small ones on the end, and a combination of the larger ones for the 6m run. I did not need the longer ones - the gutters took the 16mm magnets very well so even on the larger ones I'd only had 16mm magnets either end.