Resin for baffles?
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Resin for baffles?
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Topic: Resin for baffles? (Read 704 times))
Loki_762
Head Hole Puncher at Wild Willy's Rat Ranch
Plinker
Posts: 268
Real Name: Chris
Resin for baffles?
«
on:
October 21, 2021, 10:31:10 PM »
I have an Anycubic Photon, and I have recently designed some baffles I would like to print out. Is there a "gold standard" for the best resin to use when printing baffles?
Thanks,
Chris
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Seattle, Wa
Never argue with an idiot. First they bring you to their level, then they beat you with experience.
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Re: Resin for baffles?
«
Reply #1 on:
October 24, 2021, 04:07:22 PM »
Chris,
https://www.anycubic.com/collections/anycubic-photon-3d-printers
These printers look nifty. Especially at the price.
Your question about resin choice could be refined with a bit of background. Without that info, generally, material that is not brittle is good for baffles. How stiff and strong the parts will be depends on their size and shape. In the case of round baffles, the larger the diameter, the more floppy the baffle will be at a given thickness; unless you make them cone shaped. Or add ribs. If the baffles are flat, they need to be much thicker to achieve the same stiffness and structural integrity.
The other thing with part shape; I would design it so that it needs no, or minimum support structures. Also, so that any supports you have to use are not trapped in an enclosed structure. So, my recommendation is a cone angle that the printer can manage without support structures.
The load path through the structure matters. For instance; a single moncore baffle or baffle stack can be made lighter, if their is a close fitting metal or carbon fiber tube around it. Without a strong casing, the baffles need to resist air pressure more directly; especially at the start near the airgun muzzle.
So, to finally get to the
first question on most people's mind
; what airgun is this for? And at what power level? That, and few other factors result in a certain muzzle pressure. It is the latter than drives the strength requirements. You can make the first baffle thicker because it will see the highest air pressure. Or you can keep it simple, and make all baffles the same.
Here is Anycubic's resin guide:
https://all3dp.com/2/2019-anycubic-resin-guide/
Taking a quick look, I do not see any mention about "flexible" or "brittle". So, you may have other criteria, but I think the gray cures the quickest and is cheapest.
Perhaps youtube can offer some useful videos. Here is one that seems to be on topic:
The
second worst
thing to happen if your baffles fail is that you need to redesign and reprint them. The
worst
thing is if a projectile is deflected in such a manner that it escapes your backstop and goes on to do harm. So, before you have proven your baffles robust, shoot only at a backstop that can tolerate shots that deviate several degrees from their intended path. It might make sense to try out your device at less than 5 yards so as to guard against errant projectiles. They are not likely to fly off at more than 45 degrees without warning. If they do, they probably have less energy, but are more likely to visit the house next door...
If your airgun starts scattering shots it probably means that it is shedding material into the projectile path. If you keep shooting it, the damage and deviation from aim point will become rapidly worse. If you are dealing with enough power, the escaping projectile may have significant potential for harm.
So, stop shooting when the sound of the shot changes, or the groups on target start to open up, or drift. Take a look at the device to see if it has simply come loose, before condemning it.
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Re: Resin for baffles?
«
Reply #2 on:
October 24, 2021, 05:50:21 PM »
From the above video:
Anycubic Users Group Resin Spreadsheet:
https://docs.google.com/spreadsheets/u/1/d/1crvzMnt_8NJXAsABinoIhcOjE8l3h7s0L82Zlh1vkL8/edit#gid=0
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Resin for baffles?