Welcome back we’re going to do the question on page 145, which is a button. In this question we’re going to use a thing called ‘extruded cut’. Now we could have used this in the hashtag previous one that we did to cut out the center part of it but in this case we’re just going to cut out four little holes in the middle of the button. First of all we’re going to start off with a new document. So we’re going to go to ‘new part’ so double click on that will open it. Then we’re going to sketch on the front plane so we go to ‘sketch’ and we’re going to draw with a circle this time. So we’ll click on our ‘circle’ tool. I’m going to put the centre of the circle right on the origin just to make life easier for me. So I can draw that out there and then we’re going to smart dimension it. With circles you smart dimension the outside. So if you click the outside of the circle it’ll start to put in this dimension here and that’s going to be your diameter symbol. So you can keep it in the inside of the circle. I usually move it out to the side so that it doesn’t get in the way. And then I’m going to put this size 30 mm so it has resized that to what I want. So after I’ve done that I’m going to get out of this sketch because we’re now going to use our extrude boss/base to make the actual button first. So if I go to my ‘features’: ‘extrude boss/base’ I’m going to extrude this 3 mm so that we have a button with a surface, so now that has a thickness. Once you have surfaces – so a flat area or a curved area, but in this case we’re just going to deal with the flat area on the front – if you click on the surface, it brings up this little box, This is a menu that has lots of different options but one of the options is similar to what we’ve done before. So this one is ‘sketch’ here so we can click ‘sketch’. Now, it’s not going to turn the object towards us so that we can sketch on it, so the easiest way to do this is if we press space bar and there’s a handy little tool so this one here is called ‘normal to’. It means that it will rotate whatever the object is so that the surface that we’ve selected – in this case the blue one – is going to be perpendicular to us. So if I click that it’s moved it around so that I can see what I’m doing and then if you click anywhere it’s going to get rid of the blue surface, if you want to do that. So now that we’re going to sketch on this surface, what I’m going to do is I’m going to set up a few centre lines. So if I click on the ‘centre line’ tool I’m going to draw roughly a box that’s going to be made up of horizontal and vertical lines. And what I want to do is I want to make all of these lines same length, so if I hold down the control button and click all four lines and I click equal, in terms of the relations, that now has made them all equal. What we are going to do is we’re going to draw four circles one on each one of the corners here and then we’re going to make, we’re gonna cut those out of this button. So if I just click ‘smart dimension’ and click on one of the sides now – and I’m going to make it 8 mm – and you’ll find that this has now moved a box off-centre. You’ll also see as well that the square is all in blue because it can move around at the moment, it can be anywhere that you want to put it on this. So in order to get rid of that what we can do is we can draw another line going from the centre, or from this corner to this corner and we can find where the centre of that line is very simply by hovering over it and you’ll see this yellow point comes up, so if i zoom in on that you’ll see this yellow point comes up if I hover over the line like that. I want to select that point and select my origin and then in the relations over here I want to make them coincident. So that’s going to move the whole box down below so that it’s on that point. And you’ll see that all of the lines now have gone black. This line that’s here also is only going to be for construction so I can click on that and just click ‘construction’. Next what we’re going to do is we are going to draw four circles, so one on each one of the corners, and each of these circles are going to be equal to each other. So if I just press ‘escape’ to get rid of the drawing tool over here and then I can hit ‘control’, hold down control, and I can click all four of these circles and I want to make them equal and then I can smart dimension one of them – so in this case it’s going to be diameter 2 – and that has made them all the same size and I can click OK. Now what we’re going to do is we’re going to save this sketch by hitting the blue button up here. Now what you have is you have a sketch that’s on this surface. It’s in blue, but it hasn’t been, nothing has been taken out of it yet. So what I want to do is when it’s in blue it means it’s been selected. If somehow you click on something and it disappears – so at the moment it’s in grey – you can go over to the design tree and select the sketch, again, from over here, and what we want to do is instead of using extruded boss/base we want to use extruded cut this time. So we’re going to look at extruded cut. And then there’s a few different options. So here what we can say is we can say ‘blind’, so if we wanted to go a certain distance – so let’s say we didn’t want it to go the full way through our piece, I could change this so that it only goes 1 mm into my piece. I could also say that I want to say ‘through all’ – that means that it’s gonna go through everything. And then there’s a few more options that we’ll deal with later on. In this case I want to go ‘through all’ and then I’m going to ‘accept’ that. So that has cut those four holes out of that button.