Square to round

right this is a short video just to explain how to create a squared around which is part of unit standard 2/5 704 I've drawn the plane and the elevation here the first thing that you probably want to do is to label them so I'll go a b c d and that means that this the elevation is a b and c d will want a number our points in our circle so if we start here and we'll call this one I've stopped divided the circle up into twelve equal parts using the compass using the radius now to step that out it should be something that you're familiar with so they're two three four five six seven eight nine ten eleven twelve so we've got a plan view you can see the true length of the rectangle and the true size of the diameter and off the elevation you can see the true length of the height but all these lines are sloping away then both these views so we can actually see a true length and either view of any of these lines now this is going to we're going to split this pattern here and we're going to say that it's not symmetrical so therefore the whole pattern will need to be developed and practice if you're folding something like this up you would make the pattern in two parts because you can't really fold it on the on the break Chris and achieve the false shape because it will grab the machine at some point so what we're going to do here is create a true length diagram the week we start down bottom here we need a horizontal and a vertical and two to create our pattern which is going to be over here we're going to start with this triangle first so if we set our compass I might use a larger compass for these lines if we see our compass to a 1 here and Mark a 1 on here label it a 1 and then I'm going to build this pattern as I go I'm not going to create the full the true length diagram initially I'm going to build it as part of the process so we'll set our compass to that length and before we can use that we need to create a base so our patterns going to start over here and the base is going to be 55 millimeters and take that straight off the off the plan view so there's our two points I'm going to start from and a one here we'll call that a and then B and throw an arc and we go b1 and this is almost symmetrical so but for the purposes of this we're going to say that it's not drawn here slightly different the one put a compass on here stand it there be one that's point one and we can draw that in that selfish triangle okay so the next one we're going to do is be two so we set our compass there 1 to 2 e 2 down on to the true length diagram put a compass on here sit to the right length b2 over here and while we're at it we'll create a 12 it's the same length in this case that the sizes could be all be different depending on the position of the around to the square scribe that in there now this is where it's handy to have two compasses so we'll set our small compass to this dimension here and then we go from one because we're going one two it's not quite accurate one to twelve you will never create a truly accurate squared around using a pencil like this there's a thickener and in particularly at the size because the thickness of the pencil is quite a big error okay we've now got two points two new points so we've got b2 so call it on two and a12 okay now I'll draw these ones in but that'll be the last time before we get to the end because I'm going to one so we'll just pull the lines in and I'm using the nice big fat pencil so you can see what's going on bro a sharp pencil will make things more accurate okay so we just continue the process and so now we go a11 the one there and b3 and once again use our compass to go from the end of this line to here before now you'll see that we're on another big triangle now so things are going to change a little bit for the next step of the process and will go a 10 the 10000 compass again on to these points so it's a 10 3 4 right so I'll call these lines in and then we'll use a slightly different process for the next triangle we now need to set our compass to this length because that's going to be the bottom of our next big triangle and these are both the same and then we are looking at these so that's we've got that line now we need to find that line so C 4 once again comes off the plan and read from here up to here and slowly for D 10 yes now we've got that link okay so now the next thing we need to do is find our next point here so that's going to be in this case d9 now I'll just make these up so we've got B C and a D and this is d9 so we'll pull that one in here and then on there point there so we've got this triangle here so I can put this one at the same time let's see five since six in order what denominate eh you can see here I'm almost going to lay out a paper so it's important where you place your start point for your transition although you said that as I mentioned before half pattern is often the case so you be 22 half pinned 1 2 3 4 so we've got time c7 need and d7 so what the feeling this is going to be near the same so we can use the same sit in there so you okay then just the finishing part well we need to run take this is a true length of here so we can take that no doesn't excuse me we've got d7 c7 now we need these two halves it is a true length to be honest it's our height so the two halves will create right angle to the transition and we'll measure down this length yeah and these two corners here should be a right angle and all we need to do is sketch in our Koo and then we have a squid around transitional rectangular rectangle around transition please

Channel: Martin Glaeser

Views: 229,565

Keywords: Technical Drawing, Open Polytechnic US25704

Id: RzaOTPOwZyU

Length: 17min 50sec (1070 seconds)

Published: Tue Apr 05 2016