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Thread: HDPE joinery
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28th March 2021, 11:00 AM #1
HDPE joinery
What's the best way to secure 1/2" walls of HDPE together for a wood/resin mold? Drill and tap holes in the edges and use course thread screws?
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28th March 2021, 01:26 PM #2.
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Yes - you can even use wood screws if you don't want to tap a heap of threads.
To tap the threads I used a cordless screw driver with the clutch set on about 5 - drill the hole slightly smaller (0.1-0.1mm) than recommended
Do a practice run of course.
At work we often just used stainless wood screws - the kind that look like self tappers with thread all the way along the screw,
We used a lot of countersunk screws but if you don't want to risk the holes blowing out eventually use this kind of screw
Screen Shot 2021-03-28 at 10.20.31 am.png
If the mould is to be repeatedly used, the HDPE will creep over time (that's why CS screw holes also blow out over time) so some form of joinery dads etc will keep it better in shape.
A sketch of what you have in mind might enable further advice to be provided.
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29th March 2021, 10:07 AM #3
Thanks BobL. At first I was considering using metal inserts screwed into tapped holes but after thinking more I think the inserts might splay the form out some so I've settled on going with straight screws into tapped holes.
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29th March 2021, 01:03 PM #4
I use a bead of silicon and cheap wood screws
Neil____________________________________________Every day presents an opportunity to learn something new
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30th March 2021, 10:19 AM #5
Thanks dai sensai, yeah I'm always over thinking things. I was wondering about sealants with HDPE. So you say silicone sticks to it fairly well? Wouldn't imagine it would be too hard to pry off.
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30th March 2021, 09:10 PM #6
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31st March 2021, 09:19 AM #7.
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Very little will stick to HDPE but we also used (MANy) tubes of silicone to seal HDPE boxes/joints at work. A physically stronger seal can be obtained by welding the HDPE. but this requires some skill as its easy to overheating burn the plastic.
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31st March 2021, 11:12 AM #8Neil____________________________________________Every day presents an opportunity to learn something new
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1st April 2021, 12:52 PM #9
Good to know the HDPE is 'sealable' now. Do you use anything else to help hold your HDPE molds together, screws or clamps maybe?
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1st April 2021, 10:59 PM #10
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