Gallery, Projects and General > Project Logs
New Curtains and Windows
PekkaNF:
Pretty sure you have considered rubber well nuts?
https://www.hansonrivet.com/threaded-inserts-2/rubber-nut-threaded-inserts/
Or the problem is the hole?
Attaching these is a challenge. Different thermal mass and thermal expansion coefficient makes mounting challenging. Dunno. What do they use in greenhouses and winter garden?
Any welding and grinding nearby? Some plastics break on ozone and UV. Some plastics is UV protected one side only, specially the greenhouse variant.
WeldingRod:
Um, is there any chance you are confusing acrylic with polycarb?
Acrylic pretty much requires special plastic drills or it shatters. Polycarb laughs even when your drill sucks it out of the vice. Speaking from experience :-0
I've never seen stress cracks in polycarb! Are you using some really nasty solvents in your coolant?
Sent from my SAMSUNG-SM-G891A using Tapatalk
awemawson:
Definitely Polycarbonate, yes it drills beautifully at the time, it's only later that the stress cracks appear.
No doubt that the soluble coolant and the tramp oil have contributed to the problem, though I do remember that when fitted the current Windows having used the original Perspex ones as drilling templates, some holes were a tight fit.
At the time I thought that it wasn't an issue as polycarbonate is tough stuff, now I know better :palm:
nrml:
Why not ditch the screws altogether and use a suitable version of 3M VHB tape to bond the polycarbonate to the metal panel. If it is good enough to bond windscreens on cars and exterior fascia panels onto skyscrapers, I can't see a machine window being a big problem.
You can pre-apply it to the window panels and peel and paste as you apply it to the metal. Holding it in place till the glue cures will not be an issue.
awemawson:
They are going in an enclosure that has been splashing oily coolant around for decades, getting it clean enough for a good bond might be very tricky.
I think I'll stick with screws (no pun intended!) - if it lasts another 6 years as the last lot did it's not too bad!
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