tried one of my expensive metal time locks last night.
ran into a design flaw, thought i would propose it to you to see if it is solvable.
basically, if the force is coming from any direction not ****perfectly**** straight out, the pin binds, therefore not releasing you. see if you can guess how i got free from the photo. when i figured out what was going on i was on hour 4 of 2.5.
it might be solvable with the casing shaped like the right side. of course you cannot expect it to come out if you are putting tension on it from a 45 degree angle away, but i think it should have a slightly better tollerance than like, 2 degrees binds.
Reliable, self-releasing ice lock
Re: Reliable, self-releasing ice lock
I recently came up with a newer, safer design. A rough sketch is attached.
Instead of daisy-chaining multiple devices, there's only one. But in this updated design, there's more than just the outer case and inner stem--there are one (or more) intermediate shells. The advantanges:
1) If any one shell gets stuck, other shells can still slip out when the ice melts.
(this one addresses your problem)
2) Multiple shells means that each layer offers several degrees of freedom. Each additional layer would add a few degrees. If you have 3-4 layers, you might have 8-10 degrees to work with.
Another point addressing your metal device. The stem is about 3x the width. My initial design was about 1.5x depth to width. A shallower depth allows the stem to come out easier.
Instead of daisy-chaining multiple devices, there's only one. But in this updated design, there's more than just the outer case and inner stem--there are one (or more) intermediate shells. The advantanges:
1) If any one shell gets stuck, other shells can still slip out when the ice melts.
(this one addresses your problem)
2) Multiple shells means that each layer offers several degrees of freedom. Each additional layer would add a few degrees. If you have 3-4 layers, you might have 8-10 degrees to work with.
Another point addressing your metal device. The stem is about 3x the width. My initial design was about 1.5x depth to width. A shallower depth allows the stem to come out easier.
Re: Reliable, self-releasing ice lock
Also an update to the 3d printed lock: Acetone vapor treatment.
This melts the surface of the lock and makes the individual layers bond together better. The resultant lock is much stronger, comparable to injected ABS.
And looks nice too.
This melts the surface of the lock and makes the individual layers bond together better. The resultant lock is much stronger, comparable to injected ABS.
And looks nice too.
Re: Reliable, self-releasing ice lock
Your printed Lock looks really good. And you are right, it doesnt have to be round to make it work and even be safe.
Have you checked how much weight is possible to hang on it, without destroing your device ?
Have you checked how much weight is possible to hang on it, without destroing your device ?
- blowmymind
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Re: Reliable, self-releasing ice lock
Hey, I just wanted to share a PERFECT design of an icelock that I have done YET. You take two pieces of chain and freeze them in a bottle that has a bottleneck. Can't go wrong... And a 150ml drug bottle (something like this http://jiachengeoe.en.ecplaza.net/2.jpg ) holds it for about an hour. It never stucks, because there is enough space for both chains to come out of it, and I've hung a 5 kilogram weight on it, nothing bad happened.. You can even use a 500ml plastic coke bottle for much longer times than 1 hour.