So now we can go ahead and find some fasteners to attach the battery holder to the top solar cell holder here. Again, we're going to go to McMaster is a really great place to go for fasteners. Let's go to the homepage, I click on screws and bolts. There's many different kinds of screws and bolts here but you should be able to just go by I you can even you know, take a guess you can't really make too many mistakes with choosing a fastener. Of course they all have different unique purposes, but each one will work for, you know, of course many things outside of its purpose for this fastener, we could go with a flathead screw something with a small profile that's not going to stick up too much. A Phillips flathead screw Again, we're gonna want corrosion resistance.

So stainless steel Philips flathead screw looks okay to me, and then we need to choose a size. Let's try some 630 twos. And for reference diameter and 632 is going to be something near around an eighth of an inch, so it's a small screw. And for a length we can, you know, taking gas again, half inch long, we can give that a try, go to product detail, choose Save, go back into fusion 360 and let's upload that screw. Here it is right here. Close that make sure that the assembly is activated.

And let's pull in the screw. Go ahead and just hit OK. let's right click it, break the link. So now we have our screw. And first of all let's just see if we are close. So I want to turn this 90 degrees First of all, let's right click move. Grab this arrow here and rotate it exactly 90 and hit OK. Up sorry.

We need to fly Looks at around 180. Now, grab the arrow, flip it one at a head, Okay, and let's try and drag this close to in place we can go ahead and hide the light cover, that'll help us a little bit. Push it up a little bit, something like that. That's pretty close. And now if I pull this cap down, that's actually going to work looks like it'll work fairly well for this. So you can see that we can still, we should still be able to screw you know, access this screw.

It needs to go through the thickness of the battery holder and that is going to have to go a certain distance into this cap into those tabs that we created. That distance looks fairly good. We don't need to get too technical on, you know, for example, the number of threads that it requires to hold something properly in place, you should be able to, you know, just give a general judgment, you don't want to just be hanging on the very end of the screw. But we have pretty good thread engagement, you know, you're using maybe five five eighths or you know, almost three quarters, probably three quarters length of this screw which is, which is fine. So the screws should work for us pretty well. So now let's position those and make sure that they're gonna work.

I'm gonna go ahead and let's see. Let's hide this piece. Because it's getting in the way a little bit if I just click on the piece at highlights in the tree, you can see the blue underscore here and I can click the light bulb to hide it. Now when I drag this screw into place here, you can see the outline of the tab that we created right here. I also need to clear the lip that we created, and I'm coming really close. So what I want to do is extend this tab a little bit further so that I can get my screw in there.

So we need to modify that. And this is a common process, you know, in your CAD model, you're going to create something, see if it works. And if it doesn't, we can always change it later, we can easily make changes which you know wasn't possible in the past, but we can make changes on the fly here. So we need to modify this piece. Let's go ahead and isolate it to make it the view of this Much more simple. So we don't have all these confusing parts conflicting with each other.

Just get it by itself. I want to extend these tabs in a little bit further. And we should be able to do that fairly easily. If I expand it in the tree here. I should be able to modify a sketch to be able to do that. I think it's this last sketch, edit sketch.

Looks like it is. Let's try and get this 90 degrees. Okay, okay, actually, we don't need it exactly at 90 degrees for this and what I need to do is just extend this first of all, let's just try Well, let's set sketch dimensions so that we are doing this properly. Let's click here and dimension it off of the center. Right now we're at 1.094. Let's see what happens if I make that a little bit smaller.

Let's just make it one. That change right there might do it. We hit stop sketch. Let's isolate and activate. Here is our screw and I can move it around and you can now see that we should be okay on a clearance now I need to clear the lip and I also need to have some room from the edge of our tap and I looks like I'm good now with the diameter of this screw. So that looks like it will work.

Let's create some holes in these tabs here. So let's go back to the solar cell holder. Let's isolate it. And I want to create some holes on this face. Let's go to sketch create sketch, click on that face and I need to create a couple circles. Let's hit Escape to cancel that let's first of all create a, just a construction line straight across so I know where my center point is.

And right click and make that a construction line. Sketch circle in terms of the size of This is going to be according to the size of my screw. The screw that we brought in was a 632 thread size. If I go to my chart here 632 let's go ahead and make it 1100 or 110 thousands. Looks like it should be good. So I go to sketch sketch dimension 110 Let's set a sketch dimension from the center of the hole to this point Right here, for some reason that didn't work again.

Repeat sketch dimension from the center of the hole. There we go. Let's just go 1.25 and now let's just do the same thing on the other side sketch circle. Create a circle and a sketch dimension same diameter as the other side and the same distance To the center and we set that at 1.25. We stop sketch and let's create extrude and I just extrude this and looks like I have a center line in there again. Let's go into this sketch real quick and see if we can delete this center line if there is one here.

Not sure that there was one. Again, let's go to create extrude Looks like there is one but that is okay. And the distance that we want to cut extrude is going to be let's try negative point five. A length of our fastener was, I think point five. So let's just say negative point seven and hit OK. You can actually tap into a 3d printed part. And so when I 3d print this part, I can either I could either include the holes and 3d print this part with the holes in it, or I could just leave them off and I could simply just drill a hole myself into my 3d printed part and then tap it, you can actually you can buy a tap set for definitely less than $50.

It's very easy to do at home. So those are two different ways that you could get your holes in here. So let's isolate my solar cell holder and see what we have here. Let's try and put our let's try and form a joint. Let's first of all form a cylindrical joint on my screw here so let's go She's the center of the screw and the center of this whole. It's not popping up too easily for some reason.

Sometimes that happens. Let's try again here. Assemble joint. And let's choose cylindrical and maybe that will make it easier to grab it. Grab the center of that and the center of that This is a cylindrical giant, I believe that worked. To make this a little bit easier to see I could go into this little monitor display setting here object visibility, I can turn off sketches.

Now I can see a little bit easier. I can also right click items such as this, this is a rigid joint icon. I could right click Show hide. I should be able to turn off the joints as well. Objects visibility joints. Now it's a little bit easier to see.

See if I can pull my screw out. I think it's hidden in this hole. If I go on the tree here, and right click it and Hit move. See if I can pull it down and hit OK. And that looks good. So my screw is properly in that hole there. And with the size of the screw head it actually looks like I need to move my hole out even further because I'm not clearing that lip.

So let's move it out a little bit further. That's not too big of a deal. We can do that fairly quickly. If I go to once again, isolate the solar cell home They're here. And let's do this by editing this sketch. I need to make sure that the sketch is visible here.

And I shouldn't be able to change these dimensions from one point to five. What if we did 1.2 and 1.2 stop sketch. Let's on isolate and activate our assembly again. Show the top and show our screw click the bottom for right angle view It looks like we are still actually not clearing out. It looks like the screw didn't move along with that joint. So the screw is still attached to the old position.

So if I right click on the screw here, and I choose Select referencing joints and then I go up to the joints here you can see that the joint is highlighted. Let's go ahead and just delete that joint because it's not working properly and let's redo it now with our new screw position. And so I can go to assemble joint and it's going to be a cylindrical joint turn off sketches here. Let's try this one more time. Now it works. There we go.

Cylindrical joint hit okay. And now let's see if everything clears as we want it to right click on my screw, and let's move it down and hit OK. Now if I push my screw in that's right click move again and hit OK. Now we're clearing and that looks good. Let's make a copy of that screw. And we're going to right click it copy, click in the open space, hit paste. Let's just drag it out of the way there. And let's move this screw to the other hole, assemble joint.

Click on the hall and click on that looks great head okay. I have to move it out again, I think. Let's just pull it down. I'm hit OK. Let's actually take the other one. And pull it down a little bit and activate our assembly.