Videos - The Coin Bot

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00:00:00	so join me on our journey into the third dimension hello everyone and welcome back to the channel in the last video we came up with a pretty good two-dimensional design for our coin Grabber and I'd really like to fine-tune
00:00:13	that in three dimensions in this video the problem with that is I think it's really going to test the limits of my 3D printer and also my brain but before we begin let's just review what we did in the last video and
00:00:28	this is what I ended up with I ended up printing everything in a single color again just because that makes it easier and the print resolution seems to work out a little bit better if the the print nozzle stays warm the entire time it's
00:00:41	not switching between colors for each layer but this is what I ended up with um I think there's some tweaks that I can still do here uh but it seems to work pretty well this lever is much thicker now and it rotates in and out of
00:00:58	position so that we can actually grab onto the coin the size of that pivot is a little bit larger now and that worked out very nicely um it printed pretty well and the pieces interlock together very well now too and we're getting a
00:01:13	good action for capturing and releasing the penny so I'm pretty happy with that this rocks back and forth like that and that almost closes so in the next iteration I'll have to close up that Gap a little bit make that Gap a little
00:01:28	tighter um but we're getting closer I'm pretty happy with the way this works so you can see that when there's a follower that comes along this path here it will push down on this and release the coin and I can kind of show you that in
00:01:44	action too if we're pushing down on this side of the bar and that'll be controlled by a rubber band that that spans this Gap here um when we use that follower along the outside edge here that'll push down on that and release
00:02:00	the penny so that actually works very well hey everyone it's future me I just wanted to take a moment to say that I've been doing some work on our website at the coinb.in related merch and get early
00:02:12	access to my YouTube videos I hope you'll get a chance to check it out and let me know what you think down in the comments the problem with this design is that there's nothing holding this vertically in the coin slider and this
00:02:23	part can actually fall out so I think we need to be thinking about this piece also in three dimensions to this point we've been thinking about this only in two Dimensions we draw a two-dimensional version of this and then
00:02:36	we extrude it into the 3D space but this still has some thickness to it we can prevent that from moving in this direction if we were to use half of the layers to control that direction and then the other half to control the
00:02:51	grabbing mechanism that we were talking about before and if we could figure out a way on top of that to use a rubber band or some other mechanism to actually pull this into Position will be in much
00:03:06	better shape because we'll have a positive stop and a positive control of the penny as it's being rotated over the coin studio in our next iteration I want to uh use some of the thickness of this to
00:03:21	control the the Z AIS here because we can see that these pieces will actually snap apart if we're not careful when they're actually in the machine so I want to make sure that that doesn't happen we can use about half the
00:03:34	thickness of this to control that movement um and there's a couple of other things I like I said I want to tighten up this Gap a little bit it doesn't need to be quite so wide it doesn't have to move quite that much in
00:03:47	order to capture the penny and let's see I want to and I also want to create an area that the rubber band can attach to I think I'm going to do that underneath and I'm going to try to do that with just half the thickness of the part but
00:04:01	we'll see how that goes I'm going to play around and freak out a little bit but so far I'm pretty happy with the two-dimensional aspects of this we're going to take this and uh use half the thickness to control that that sway here
00:04:15	though now since this part was so thin and there were so many little details that I had to think about I found it really difficult to do all of that in my head so what I found was that it was really helpful to actually draw on some
00:04:27	of my prior 3D printed versions with a Sharpie marker so that I could kind of indicate to myself which pieces needed to come out of the z-axis and which could stay on the same plane it also helped to sketch this out on paper so
00:04:41	that I could see at a glance which pieces needed to be on which layers as this thing printed out so that was very helpful well once I was done with that we could start the actual 3D design work in freecad and we could see how all the
00:04:54	pieces fit together so moving between 2D and 3D for me is usually pretty easy I can normally wrap my head around things like this pretty easily I have a good mind for that but I don't know if it's because this part is so thin and because
00:05:08	there are so many little details that I need to add in order to get this all to work together that I was really having a hard time wrapping my head around the three-dimensional aspects of this particular
00:05:19	piece and in freecat I was really having a hard time because I would have to keep switching between shaded and wireframe versions of the part so that made it really difficult to maintain my perspective both literally and
00:05:36	figuratively now designing with the full coin slider in mind meant that I could bring that entire part over to the bamboo slicer and from there I could also cut out pieces of it so that I could reduce the amount of filament that
00:05:48	I was wasting on each of these iterations but of course breaking that part up in the slicer itself meant that I had a slight learning curve again and I had to learn how to do that in this new software package so that took a
00:06:01	little bit of a learning curve but I eventually got that figured out and in this time lapse you can see that I actually ended up printing way too far from the camera and I will try to remember to make sure that my prints
00:06:14	are closer to the camera from now on so that you can actually see what's going on sorry about that [Music] oops I consider this really a good parsal draft um there still some issues
00:06:31	I need to widen this area a little bit more um the pivot seems to work okay the handle is fine I need to shorten this length I had to actually physically cut that so that it work a little bit better and I need to figure out some other way
00:06:46	to handle this rubber band issue um I think I might just cut through holes there but we're on the right track so I feel pretty good about this we did solve the problem of the vertical alignment here
00:06:59	so I think with these and this is a little bit stiffer now with this support material in here so that's good I'm going to maybe do one more uh version of this during this video and I know that there's got to be an easier way to build
00:07:15	this or to design it in the software so I might start over from scratch there the other thing that I noticed is that um because I was only working with a little partial Circle um the part ended up being flipped over and I'll need to
00:07:30	deal with that in the finished product I need to figure out how to make this still printable when I'm all done so so a few challenges to figure out but I'm actually pretty happy with the way everything lines up as I talked about
00:07:41	really briefly in the last little segment too because I had been working on only just a little Half Moon shaped portion of the coin slider I actually got that mixed up when I when I moved into the 3D World I realized that I had
00:07:57	actually created the holes on the the wrong side of the coin slider and it was no longer printable the way I had done it so you actually have to think about the orientation of the finished part because you need to be able to print it
00:08:11	on the 3D printer and that requires you to be able to lay things down in layers and the way that I had done it there would have been extremely wide overhangs which are not 3D [Music]
00:08:25	printable I kind of like this time lapse because of the camera angle you can see the three dimensions that I'm trying to work with here and how thin the parts are so you can see how difficult this was for me to kind of wrap my head
00:08:37	[Music] around but overall I think it's really starting to look pretty cool I think I'm pretty close with this version but there's still some tweaks I need to make when I finish this design you can see
00:08:54	that the bar here still bends too easily and I think I can fix that if I actually had that bar wrap around the pivot completely and the other thing I'd like to improve is that I think there needs to be a little bit more room here for
00:09:08	this swing mechanism to happen so I want to make sure that there's enough room on both sides for this bar to swing widely on both sides so that we can be sure that we are either grabbing onto the coin and holding it firmly or releasing
00:09:23	the coin we want to make sure that those two actions are uh binary that's either on or off I don't want it to be stuck in some sort of weird limbo but I think that's enough for today in the next video I'm going to try to find tune the
00:09:35	design and add those couple of changes that we were just talking about but for now that's my two cents thanks for watching everyone stay tuned and stay awesome