WEBVTT 00:00:00.000 --> 00:00:09.000 But what we're going to do is we're going to do a couple shots and we're going to get a couple different views of this area and the business end of the piston. 00:00:09.000 --> 00:00:12.000 Well, one of the business ends. All this is one business end. It's all business end. 00:00:12.000 --> 00:00:21.000 Anyway, here we go. So what we do is, because it's on single, it's going to close, it's going to do a shot and then it's going to open and then it's going to stop and wait for me to hit run again. 00:00:21.000 --> 00:00:25.000 That's why it's called a single shot. We just don't have it set up for multi-shot. 00:00:25.000 --> 00:00:30.000 We don't have an ejector plate. Yeah, we have a door open because the plastic is stanky. 00:00:30.000 --> 00:00:33.000 So we're just going to send it. 00:00:33.000 --> 00:00:35.000 Now it's going to go the other way. 00:00:47.000 --> 00:00:50.000 Now comes the fun part of having to fish it out. 00:00:50.000 --> 00:00:54.000 You guys got it? Oh, that actually wasn't that bad. 00:00:54.000 --> 00:00:57.000 Except it's supposed to stick to the other part. 00:00:57.000 --> 00:01:01.000 So this is what we say. We have to run a couple shots before it actually works properly. 00:01:01.000 --> 00:01:04.000 There you go. We made a thing. Hey! 00:01:04.000 --> 00:01:07.000 It's a little warm. Also like that air bubble though. 00:01:07.000 --> 00:01:10.000 So there's a little bit of a color difference between these two. 00:01:10.000 --> 00:01:16.000 I'm not sure if that'll come through or not. But that's essentially going to come down to the plastic itself. 00:01:16.000 --> 00:01:22.000 It has been heated up and cooled multiple times. It's a little bit, like, not denatured but overheated. 00:01:22.000 --> 00:01:25.000 So what happens is every single time you heat up a plastic, 00:01:25.000 --> 00:01:28.000 you basically burn more of the carbon, right? 00:01:28.000 --> 00:01:31.000 So when you burn carbon, like, it's charcoal basically. 00:01:31.000 --> 00:01:34.000 So it goes more dark as it goes more black. 00:01:34.000 --> 00:01:37.000 You basically want to heat it up, shoot it, and then be done, right? 00:01:37.000 --> 00:01:40.000 If you were to take that, re-grind it, use it again, it would come out darker. 00:01:40.000 --> 00:01:45.000 It's more noticeable on clear parts because, like, there's literally, 00:01:45.000 --> 00:01:49.000 like, you can just see there's a change in, like, transparency. 00:01:49.000 --> 00:01:52.000 So what did happen was it clamped. 00:01:52.000 --> 00:01:56.000 The gate opened, the piston, like, loaded it itself, 00:01:56.000 --> 00:02:01.000 and then released to actually shoot the shot. And then it waited for a bit for the plastic to cool, 00:02:01.000 --> 00:02:05.000 and then it pulled the mold away, which is what it's doing now. 00:02:05.000 --> 00:02:09.000 And the reason why it's sticking to the wrong side of the mold 00:02:09.000 --> 00:02:14.000 is we were a bit impatient, and we didn't really wait for the mold 00:02:14.000 --> 00:02:19.000 to get out to temperature, and we just kind of ran it. In theory, you can't run it unless this whole effect sensor's active, 00:02:19.000 --> 00:02:24.000 so until we close that, we can't run it again. You never want to stick your finger in between the plates, 00:02:24.000 --> 00:02:29.000 which is why we have tools. Trim removal tools for a car. 00:02:29.000 --> 00:02:33.000 That's what they sent us. It's still not lighter. 00:02:33.000 --> 00:02:38.000 It's still pretty dark, so that still means we have old plastic in there 00:02:38.000 --> 00:02:45.000 that hasn't been kind of pushed through. Let's do one from here, where you can actually see the piston being loaded up. 00:02:45.000 --> 00:02:48.000 Like I said, there's this big shock absorber-style spring, 00:02:48.000 --> 00:02:54.000 and this Chungus motor that drives it. Robert will talk you through what he just talked to me through, because I was... 00:02:54.000 --> 00:02:58.000 So, Robert, when I hit run, you're going to do your spiel. 00:02:58.000 --> 00:03:02.000 So, here we go. I'm going to hit run. This is good, boys. 00:03:02.000 --> 00:03:08.000 Look at it light as it moves. As it starts to move, you can see how slow the motor's moving with that piston. 00:03:08.000 --> 00:03:12.000 That wouldn't be fast enough to inject the plastic just with the piston. 00:03:12.000 --> 00:03:18.000 So you can see now the spring is compressing. What's actually happening is we're compressing the spring to build the amount of injection pressure, 00:03:18.000 --> 00:03:22.000 and then in a minute you'll see that chain up top when that opens. 00:03:22.000 --> 00:03:25.000 Then the spring actually releases all that built-up pressure, 00:03:25.000 --> 00:03:31.000 and that's where you get the injection speed, because the motor doesn't move fast enough on its own to inject it just with the motor. 00:03:34.000 --> 00:03:41.000 That little bit of chunky chunk. That's it, holding the injection, the hold pressure for a long period of time. 00:03:41.000 --> 00:03:44.000 So it's kind of going a little bit forward, going a little bit back 00:03:44.000 --> 00:03:47.000 to tune the hold pressure to be just correct. 00:03:47.000 --> 00:03:51.000 And if you look on this side... Yeah, it came out on the right side. 00:03:51.000 --> 00:03:53.000 Almost perfect shot. 00:03:54.000 --> 00:03:56.000 Okay, someone take it out. 00:03:58.000 --> 00:04:02.000 The reason why Robert said the motor's not fast enough 00:04:02.000 --> 00:04:05.000 is because the plastic cools really quickly when it hits the mold. 00:04:05.000 --> 00:04:10.000 So you have a very limited time for it to flow around the whole cavity. 00:04:10.000 --> 00:04:16.000 So you need to go fast, but not too fast. 00:04:16.000 --> 00:04:19.000 There's a very defined time it needs to go in, 00:04:19.000 --> 00:04:24.000 and that's kind of why you build up the pressure. They just whack it all at once, then they're like slowly eking it in. 00:04:24.000 --> 00:04:28.000 Because imagine hot plastic touching a cold surface. 00:04:28.000 --> 00:04:33.000 It'll start hardening that surface, and then the actual flow will just stop. 00:04:33.000 --> 00:04:37.000 And then if it doesn't fill the whole mold, you'll get gaps. 00:04:37.000 --> 00:04:45.000 So imagine it not going all the way around. So on this part, you can imagine the plastic traveling through here, along here, 00:04:45.000 --> 00:04:48.000 and then splitting, and going all the way around and coming back here. 00:04:48.000 --> 00:04:55.000 If it was too slow, you would only get maybe that amount. 00:04:55.000 --> 00:05:00.000 So when it splits, it'll slowly solidify, solidify, solidify, then stop. 00:05:00.000 --> 00:05:05.000 And then it's like, oh well, you've just gone and fudged up because that's not what you wanted. 00:05:05.000 --> 00:05:11.000 So you have to shoot it fast enough so that by the time it actually meets up again, 00:05:11.000 --> 00:05:14.000 it is still molten. 00:05:14.000 --> 00:05:17.000 It's not exactly the right word because it's not technically molten. 00:05:17.000 --> 00:05:22.000 So right now, we're changing the mold out, so you probably want to get this on camera. 00:05:22.000 --> 00:05:25.000 So this thing, it's held on by some clamps on either side. 00:05:25.000 --> 00:05:29.000 But you just have to loosen off, and you kind of stop them. 00:05:29.000 --> 00:05:32.000 That might be warm. It's not too bad. Is it not too bad? 00:05:32.000 --> 00:05:38.000 It's not too bad. Don't touch this part. You can also remove the shroud. 00:05:38.000 --> 00:05:42.000 So you can see how this part was made. 00:05:42.000 --> 00:05:45.000 Oh my goodness. There's some shrinkage here. 00:05:45.000 --> 00:05:48.000 Yes. Plastic shrinks when it cools. 00:05:48.000 --> 00:05:55.000 Okay. That part made that. Now you can imagine if you can visualize what this is going to make. 00:05:55.000 --> 00:05:58.000 So everywhere where there is a gap, there is going to be plastic. 00:05:58.000 --> 00:06:05.000 So you're going to have this same little, we call it a sprue. 00:06:05.000 --> 00:06:09.000 Basically, sprues go up and down, and then runners go side to side. 00:06:09.000 --> 00:06:13.000 So this is a sprue. That's a runner. And then this is the actual part. 00:06:13.000 --> 00:06:16.000 So what you would do is you would break this off eventually. 00:06:16.000 --> 00:06:20.000 And that would be your part. The full square one. 00:06:20.000 --> 00:06:23.000 Because I cut this one. 00:06:23.000 --> 00:06:30.000 But that would be your actual part. And you would actually just get rid of that or re-grind it and use it again. 00:06:30.000 --> 00:06:36.000 But we have the sprue coming down and we have the two runners that split into the four cavities. 00:06:36.000 --> 00:06:39.000 And all we care about is that ring part. 00:06:39.000 --> 00:06:42.000 So we'll end up cutting this off. 00:06:42.000 --> 00:06:48.000 I wonder if we should get some sort of chop chop boy to re-chop this up to make more re-grind for that. 00:06:48.000 --> 00:06:51.000 It's probably not worth it at the volume we have yet. 00:06:51.000 --> 00:06:54.000 I know. But when have we ever done something because it made sense? 00:06:55.000 --> 00:07:02.000 To insert this mold back in, you have to essentially more or less line up the pins. 00:07:02.000 --> 00:07:10.000 But because it's a very tight fit, the last little bit of the insertion you actually have to do with the clamp itself. 00:07:10.000 --> 00:07:13.000 I don't know if pasty is the right word. 00:07:13.000 --> 00:07:16.000 They literally suggested it. Oh, okay. 00:07:17.000 --> 00:07:18.000 Run it! 00:07:25.000 --> 00:07:26.000 Run it! 00:07:34.000 --> 00:07:39.000 Well, I mean, it's sort of like automatic ejection. Except it's attached to the wall of fame. 00:07:39.000 --> 00:07:45.000 In all fairness, despite the ejection, the actual part itself is getting better and better. 00:07:45.000 --> 00:07:50.000 Yeah, the rings look great. It's not sticking to the mold side, which means it's getting deformed. 00:07:50.000 --> 00:07:53.000 Yeah, that's what I was pretty much about to say. 00:07:54.000 --> 00:07:55.000 Hey! 00:07:57.000 --> 00:08:00.000 The new injection molding machine that we bought. Yes. 00:08:00.000 --> 00:08:09.000 Inside is a 3D printed mold that makes rings. So, Robert designed a mold that we stuck on the SLA machine in high temp resin. 00:08:09.000 --> 00:08:14.000 We milled out a pocket of a mold, and that's now sitting over there. 00:08:14.000 --> 00:08:17.000 And now we can inject as many plastic parts as we want. 00:08:17.000 --> 00:08:21.000 Except we're trying to figure out how it works properly because we're having issues. 00:08:21.000 --> 00:08:25.000 Pretty crap. We're having issues. Oh, that's crap plastic. 00:08:25.000 --> 00:08:28.000 That's polypropylene. So, it's like this plastic you can get. 00:08:28.000 --> 00:08:34.000 It's just the least toxic, right? If we were doing ABS in here, it would stink like pretty bad. 00:08:34.000 --> 00:08:40.000 Like with hotbox ourselves with VOC, you know what I'm saying? So, we kind of just dialed it back with like cheap plastic, but it is crap. 00:08:40.000 --> 00:08:46.000 Okay. Okay, so if we wanted to do like a special one-off handle in some weird plastic or something. 00:08:46.000 --> 00:08:49.000 Potentially. Yeah. Yeah. 00:08:52.000 --> 00:08:59.000 This is basically the $70,000 optical inspection machine that can measure down to like micro and micron level. 00:09:03.000 --> 00:09:05.000 Bye! Bye, 4.5. 00:09:07.000 --> 00:09:09.000 Bye, 4.5.