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hello friends welcome to freeCAD tutorial and in this tutorial we will
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learn how to model this null knob in freeCAD and I will show you from the
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scratch how you can do the same in freeCAD and in this tutorial we will
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learn the boolean operations additive pipe features of a freeCAD we will use
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these features and we will model this null knob in freeCAD so let's start I
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will close it and I will show you from the scratch so I will switch to the part
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design workbench and I will create a new file and I will create a body and then I
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will create a sketch and I will select this XY plane and I will draw a circle
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of 20 and I will give it a diameter of 20 and I will close it and I will give the pad
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height of 10 mm and I will close it I will select this edge and go to the fillet and
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I will give fillet of R2 and then from the bottom side I will select this face
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and I will create a sketch and I will draw a circle and give it a diameter of 14
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then I will close my sketch and I will cut it to the 9mm and I will say ok
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and then I will select this inner face of my part and I will create a sketch
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and I will draw a two circle here and I will give it a dimension I will give it
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a diameter of 8 and inside one I will give diameter 6.1
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and I will close it and then I will give it a pad height so before the pad height I will again edit
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my sketch and I will cut it I will line here and I will make it vertical I will
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also make it vertical and then give a dimension of 1 mm I will select this and
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and this and give dimension of 1 mm and from this to this I will give 0 and then I will go for the trim options and I will trim this arc
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Now our sketch is fully constrained so I will close it And then I will give you the pad
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Pad of 8mm and I will say ok so this is the overall shape of our part and now we will start
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knurling it and we will see how we can nerve this now we will switch to the part workbench and in part workbench go to the
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this create primitives option here this one
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and here increment use select helix view pitch 100 mm height 10 radius 10
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and say create so you will see that uh helix has been created here now we will switch to the isometric
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view now we will again switch to the part design and we will create a body
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and we will select create a sketch and on this plane xy we will draw a triangle
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so for that we will hide this body and we will draw a triangle like this this
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and I will join this too from center I will give dimension 9 mm
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9 and this will be 10.5 and I will make these two points symmetric from here and
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I will select these two line and you angular constraint of 90 so you will see
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that our sketch is fully constrained now I will close it and I will on my body by
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pressing the spacebar now I will select this additive pipe feature here
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and I will select the object this helix so you will see that we are seeing in the
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preview but we will have to select some orientation mode I will select as a
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free net and transformation mode here I will go for the multi and I will say ok and I will select make dependent copy so you will see that this
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solid helix has been created now we will do polar pattern around our part so for
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that we will switch to the draft workbench and I will hide this grid
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and in draft workbench we will select our additive pipes and go for
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modifications and here we will go for polar array array tools polar array and
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number of elements I want 20 and I will say reset point and I will say ok so you
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will see that it has been polared beautifully now we will again switch to
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the part workbench and now first we will select our body and press the control
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key and select the array now here in the boolean operation here select this one
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this boolean operation so our additive pipes polar pattern which we have did it subtracted from the body so this
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time we have did from the right hand side and again we will go to the part primitives
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and again we select the helix and pitch we will give hundred ten and ten and we will say create
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but this time we do not want in this direction we want in opposite directions
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so we will change just to the left hand okay now we will hide our body and hide
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this helix and we will again switch to the part design workbench and create a
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body create a sketch and we will go to the isometric and we will select this
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plane and create our sketch so we will draw the same profile as we did for the
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first one so this dimension will be 9 mm 9 and this one would be 10.5 and now we will
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select these two points and make it symmetric and I will select these two
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lines and give angular dimension of 90 so our sketch is fully constrained we
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will close it we will go to the our model and we will hide unhide this body
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now we will again select this additive pipe features in object I will select this helix from orientation mode I will select for the fraynet and transformation
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mode will be the multi sections so you can see that preview of our additive pipe
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now I will say ok and I will say make dependent copy and I will now we will
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again switch to the draft workbench and we will select our edit to pipe feature
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and we will go for modifications, array tools and polar array and number of
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element I want 20 and I will say reset point and I will say ok so it has been
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pattern beautifully now I will say isometric now we will select our base
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body which is a cut and then we select array tool and we will switch to the
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part workbench we will again unselect it we will select our cut main body and
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this array so selections is very important the part which you want to
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subtract would be selected at last first you have to select your primary part so
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this is my primary part and I want to subtract on this but if you select this
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array one and then cut one then if then operation will not be performed so
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selections in a sequence is most important while performing the boolean operations so I will select this cut and this array and I will perform this cut
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boolean operation so it might take some time depends upon configuration of your system
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so you can see that operation has been performed and we have nerded our part with the help of
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boolean operations so this is how to nerd part in FreeCAD I will save my file
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so this is how to know the part in free CAD and if you like my method of teaching then
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you can support me on coffy.com its link is given in a video description and at the same
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time if you like my method of teaching then please like subscribe and share my video I
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I will come with more useful tutorial on FreeCAD and I will provide this model link in the
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video description so any beginner user can download the model and practice it and in
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the case of any doubt he can refer my model. So this is all about this tutorial
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Thank you for watching and thank you for your valuable time
