Videos - The Coin Bot

Jump to This Time	Transcription Text
00:00:00	this piece this piece here this is the heart and soul of my coin sorting robot and frankly it has been a pain in my in this video we're going to be redesigning this particular piece that I've been calling the coin slider there's just a
00:00:17	few problems with it that we'll go over first but then we're going to completely redesign the heart of my machine and then we're going to do a complete heart transplant on my robot design so that we get a much more robust part the problems
00:00:30	that we have with this particular design are that it's just not very robust you can see that this outer loop here is almost transparent it means it's very very thin and I really don't think that that part is going to hold up in a high
00:00:46	production environment we're really trying to create a robot that's capable of running thousands of coins at a time and I don't think a part that's this thin is really going to be able to stand up to that kind of wear and tear and in
00:01:01	fact one of my earlier prototypes of this um it's already broken and I haven't even installed it in the robot yet so so that's one of the major flaws here is that this part is just too fragile it's not going to hold up if
00:01:15	you've been following along you'll know that I've been trying to design a robot that's capable of recognizing valuable coins for my own coin collection and this particular piece I've been calling the coin slider this slides coins into
00:01:29	position between two cameras so that they can be photographed and then we can use an image recognition algorithm to recognize the coins and then sort them by their value the other issue that we see here is that in my original design
00:01:43	here we have these two gear tracks so that of course means that in order to hold this uh parallel during each motion you're going to have to uh include two gears here so one of the goals here in redesigning this part of the the robot
00:02:00	is to reduce the part count as much as possible so I'm going to take you through my process including the part that I design on paper and also when I translate that into a 3D model that can be 3D printed um I'm going to take you
00:02:15	through that entire process so that you can see what I've been doing over the last few videos in my rapid prototyping series here hey everyone it's future me again I just wanted to take a moment to say that I've been doing some work on
00:02:27	our website at the coinb.in there you can find the latest blog articles about coin collecting the latest developments in machine learning and get early access to my YouTube videos I hope you'll get a chance to
00:02:39	check it out and let me know what you think down in the comments when I first thought this up this coin slider was really just an idea to to rotate back and forth and I've shown that animation several times through several videos but
00:02:54	really what we have here is just we wanted a coin stack here to set down a coin onto the slider and then it would get pushed forward and then as we push the next coin into position that coin would slide
00:03:14	off the front of this slider and then be sorted but I really don't like this linear back and forth motion I think we can do better than that we know that there are three different areas of the robot that are important for sorting
00:03:29	them so we need to have some sort of que of coins so I'm thinking of some sort of stack of coins that will be waiting in Q and then so that's position one and then we want to move one of those coins that's in the queue into position
00:03:46	between two cameras so that we can photograph both sides of the coin at the same time so that's position two the photo studio and then the third position would be a coin sorter that actually takes the coin and moves it to an area
00:04:02	either based on its value either a high value coin or a low value coin if we have three areas on the finished machine we know that we will need three positions for the coins to move through and if we put these three coins in a
00:04:17	triangle like this we can start to see what I have in mind I'm thinking now instead of this linear motion that we had before we can create a rotary coin slider that moves all these coins into position so let's draw that out I'm
00:04:36	going to end up drawing circles around each one of these pennies and then I'm going to draw a larger circle around the outside of them and we'll get an idea of what I have in mind okay now you can start to see how I
00:04:50	have these coins laid out we have a circle drawn around the three coins and we know that the center of this larger Circle will be about here that could be our Pivot Point as we rotate these coins through each of the three positions on
00:05:05	the finished robot but we also can see that we can extrude this into 3D space so if we move these pennies off to the side now we can see a better design for the
00:05:19	coin slider when we bring that into freead and extrude that into 3D space it'll look something like this [Music]
00:05:35	and then we've added a gear to the center here so that we can turn this we can rotate that around the Z axis and then we'll have a pinion here that also serves to hold the the entire unit in place and the only other thing that I've
00:05:51	really done here is on the back side of this I've drilled a hole into the center so that we can again put a pin down down through here and actually control the position of the coin slider in the entire finished robot now that we
00:06:05	have that drawn up in 3D we can actually print that on the printer and come up with the finished design here I think it's so neat to be able to have a physical part you know just a few minutes after you've drawn it up even
00:06:18	though this is a huge improvement over the original coin slider uh it's thicker and we have the ability to rotate that with this Center gear here this is a much better design but there are still some issues with this in my
00:06:34	original design I want this part of the machine to hold on to a penny and rotate it into position but as you can see there's really nothing holding that Penny into place it just kind of falls through so
00:06:51	if we were to put a penny in one of these positions there's nothing holding on to it so that's really going to be our next step as we want to find some way to positively hold on to these pennies as they're rotating into each
00:07:05	position but for now maybe we should just have a little opportunity to play around with this but this is basically how it's going to work you're going to have three pennies in each of these
00:07:18	positions and it's going to rotate them through the three parts of the the three important parts of the machine that we talked about first in the next video we're going to be working on that coin grabbing mechanism to make sure that we
00:07:32	have positive control of the coins at all times for now that's my two cents thanks for joining me today and don't forget to like subscribe and hit the notification Bell to never miss another adventure on this channel stay awesome
00:07:37	and I'll see you in the next video take care everyone