from this tutorial we will start new training series for solidworks 2020. if you want to see more such type of videos then please subscribe to my channel and press the bell icon let's start when you start solidworks many of you may be seeing this welcome window you can start working in part environment by clicking on this part button here and if you don't have this welcome window then you will have to click here on new button it will show this window if you have selected advance and if you have selected this then it will show this window so in this window you can start part by clicking here and by clicking on ok and if you have this advanced window select this part and click on ok so it will start part environment now in this tutorial at first we will learn some basic sketch commands to switch to sketch environment click here on sketch and click here on this sketch button as we are only going to create some 2d sketches therefore you can select any plane suppose i will select this top plane now here i have selected this mmgs unit by clicking on this you can choose your desire unit so they have provided mks cgs ips and mmgs so i will be working with this mmgs units so this mmgs have millimeter gram and second click outside first command we will learn line here is the line command keyboard shortcut is l click on line then you will have to specify first point always ensure that when starting a new sketch always use this origin so that your sketch will be fully defined and properly constrained click first point here take your cursor away now here in this yellow box you can see that there is horizontal line this yellow box with some symbol is called as relations so it indicates horizontal relation that means the line you are going to create will be horizontal and here also you can see that angle indicated is 180 degree click to stop line command press escape so here this horizontal line is created and this horizontal relation has been applied to it to give dimension to this line click here on smart dimension click on this line take your cursor below and click specify length of line suppose i want line of 80 distance type there 80 and press enter and to stop dimension command press escape so here this line of 80 distance is created click on line take your cursor to this end point these two circle indicates it is catching endpoint click and take your cursor above so here now it is showing yellow box with vertical line that means your line is straight and is vertical click then by clicking points you can create your shape as per your requirement and as you take your cursor here you can see that it is automatically tracking from the origin click there and click once your shape got close line command automatically stopped there and it has filled with blue color the meaning of this filling is that this shape is perfectly close and is suitable for 3d creation and if you don't want to see this filling then you can turn it off by clicking on this shaded sketched contours so it will remove those filling but i will recommend you to keep this filling because it will be very useful when creating 3d objects to stop line command press escape here also you can observe there are two colors for line object one is in blue color and one is in black color the object which are with black color for which location is defined with respect to this origin and suppose if you want to convert this horizontal line into black color you will have to define location of that line the location of this line will be the length of this line so click on smart dimension click on this line take your cursor on this side and click then specify length and press enter so here you can see that this line is also converted to black color right now this sketch is under defined the meaning of under defined is you still will have to give parameters and dimensions to completely define this sketch suppose we will also give length of this line 25 enter then press escape then suppose i want this line collinear with this line so to add relations select this line press ctrl and select this line so here list of relations has been shown from here you can add this make collinear so they will become collinear and this symbol of collinear is added which shows that these two lines are collinear click outside and these two lines has become black because they are properly defined again smart dimension suppose i want to give length of this line as 25 enter then length of this line again as 25 enter click outside now if you see that complete sketch got black color and it has been said here that it is fully defined now if you try to give dimension then it will be over defined suppose if i try to give length of this line and click here it will give error that make dimension driven and your sketch got over defined because this dimension is not necessary as we have already specified this total length and we have defined these two lengths that means this length can be easily work out or there is no need to specify this length because this length is already included in this length so this problem can be solved in two ways you can make this dimension as a driven or you can leave this dimension as driving if you need this dimension as a reference dimension then you can make this dimension as a driven click on ok and click outside so here this driven dimension is shown in gray color and all the other dimension are shown in black color the meaning of this driven dimension is that if i change any dimension in this line this will get changed suppose if i change this dimension to change dimension you will have to double click on that dimension so here dialog box will appear here you will have to specify change dimension suppose i want it 20 enter so here you can see that it automatically got 35 and the black dimension remain as it is so that is the meaning of driven dimension so it will get changed automatically without giving any indication to you then press escape to stop dimension command then suppose i want to make this dimension as a driven dimension for that click on this dimension line of this dimension right click and here you will have to click on this driven and press escape so here you can see that this dimension has become driven and suppose i want to convert this dimension to driving dimension again click on this line right click and click on this driven so that it will make this dimension driving so if i now change this dimension to 20 enter so here you can see that now this dimension got changed so this is the concept of driven and driving dimension i don't want this dimension so just click and press delete button so that dimension is removed again click on smart dimension again select this line take your cursor above and click and if you click on this leave this dimension driving and click on ok then your sketch will become over defined so once your sketch got over defined then you have two options you can either delete one of the not required dimension or you can convert one dimension to driven dimension suppose i don't want this dimension so select it and delete it so here you can see that our sketch is fully defined then press escape to remove these objects press first mouse button and drag the mouse and release the mouse and then press delete button on keyboard then if you want to create some reference center lines for that click on this arrow near line and click on center line then suppose i want to create one center line from this point click there and click here then to stop center line here double click so it will stop creating that center line further ahead but your centerline command will be still running so i can create one more here and again double click i need one more here then double click and escape so here you can see that these two lines are black because they are attached to this origin but this line is blue because we have not given any dimension so to make it black we will have to place one dimension click on smart dimension select this line select this line take your cursor below suppose i want dimension of 100 enter press escape so here this line also got black then to pan this drawing you will have to press ctrl press middle mouse button and drag the mouse to zoom it rotate middle mouse button towards you then it will zoom it and if you rotate middle mouse button towards monitor then it will zoom minus suppose i will zoom it i will rotate middle mouse button towards me then suppose i want to create one circle here for that click here on circle take your cursor on this origin click center point here on origin take your cursor away and click then i want to create circle on the intersection of these two center lines so take your cursor there here it is showing intersection object snap click there and click press escape for dimension click on smart dimension select this circle take your cursor outside and click specify diameter of 60 enter we will just pan it below press ctrl press middle mouse button and drag the mouse then click on the circle take your cursor outside and click specify diameter of 40 enter press escape and suppose i want to create one tangent line so click on this line take your cursor here and click take your cursor on this side once it shows the tangent symbol click there and double click so here tangent line has been created and suppose if you want to create line away you can also create it away press escape to apply tangent object snap select the circle press ctrl select this line and from here you can apply tangent relation click click outside select the circle press ctrl and click on this line again click on make tangent so here this line got tangent properly then suppose if you want to remove these extra lines you will have to use trim entities click on trim entities easiest method is trim to closest in this method it will remove the object on which you clicks so here you can see that here is a extra line that also we can remove to see complete object you can directly click on this zoom to fit or you can also press f so here this has been trimmed properly then same way you can remove these internal objects also just click on it so those objects will be removed you can also use zoom to area to zoom a particular area click then press first mouse button drag the mouse and release the mouse press escape and click again zoom to fit now here you can see that still it is not shaded for 3d objects so there is one more problem here again zoom to area press first mouse button drag the mouse release the mouse press escape and click zoom to fit so here it got properly filled that means it is properly closed this power trim is also useful tool suppose i want to remove these outside center lines then click on this power trim to use power trim you will have to press first mouse button and drag the mouse so whichever object is crossed by this gray line those objects will be trimmed so that is power trim then corner for corner we can create some objects suppose i will create some lines so that it will be easy to explain corner double click click and escape then again trim entities then corner then suppose i want to remove this portion so in the case of corner you will have to click on the objects you want to keep so it will remove the objects ahead of that intersection point just click on the objects you want to keep suppose i want to keep object from this side so click on this line so in this way you can use corner so it will trim it and it will also extend suppose if i click on this line and this line so it will extend this line and it will create corner so in this way you can use corner tool then trim away inside press escape i will create some more lines zoom there pan it escape then click on trim entities trim away inside for this you will have to define boundary inside which you want to trim the object click on the object you want to trim so it will automatically trim object from inside this boundary and you can also use window selection press first mouse button and drag the mouse and release the mouse it will automatically select those objects and in this case it will remove internal objects press escape then for undo you can click here on undo and ctrl z is shortcut so i will just undo it again trim entities next is trim away outside click then select objects outside which you want to trim so i will select these two lines i will use this window selection click first mouse button drag the mouse and release the mouse so here objects from both the sides has been removed with reference to these two lines and we have already seen this trim to closest trim to closest can also be used for removing the objects zoom to fit then there are two more options keep trimmed entities as construction geometry so even though you trim it it will keep it as a reference line suppose i will just undo it so i will have those objects and i will click on trim entities then i will take here keep trim entities as construction geometry and suppose i will trim this line so here you can see that that line has been trimmed but it has been kept as a reference geometry or construction geometry so this geometry will be there for reference but it will not be the part of your sketch for 3d creation so in this way you can use this trim entities as construction geometry then there is ignore trimming of construction geometry now these are the construction geometries if you tick here and suppose if i use this power trim so when i will power trim it will only trim the entities it will not remove these construction objects so even though you take your cursor over it it will not remove it so this is a very useful feature because number of times we want to remove actually main objects and we don't want to remove center lines or reference lines press escape one more command we will see that is mirror entities we'll just pan it and we will create one entity here for mirror suppose i will create one sketch like this press escape for mirror you will have to create center line also to define as a mirror center line click on center line and i will create one horizontal center line double click and one vertical center line press escape i want to mirror this entity select this entity using windows selection click on mirror entities click here on mirror about and select the center line and click on ok so here this mirror has been created around this center line again mirror entities select these lines if you want you can remove the original object and keep the mirror image suppose i want this object below on the opposite side and i want to remove from here for that remove this copy option click here on mirror about and select this horizontal center line and click on ok so here it has removed the original object and it has kept mirror entity so in this way you can use mirror entities then sometimes if you rotate this object by mistake you can go back to original view by clicking here on previous view zoom to fit so that's all in the next tutorial we will solve some exercises based on this theory lecture so thanks for watching we will stop here