Create a triangle with triangle shaped hole inside of it
You did not specify how you want the inside triangle aligned to the outside one as there are many possibilities. The video may give you some ideas. As I mentioned in the video, once the polygon is placed, you cannot edit the number of sides only the size. I have completed the model with two extrusions, it is attached.
John Hackney, Retired
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Hi,
I would strongly recommend that you do the embedded tutorials in the Fusion Documentation and also some of the
Self-Paced Learning to help you to learn fusion faster and better. They can be found here:
It is also much easier for the forum to help you if you attach your file AND a screenshot of what you want to achieve
and what the problem is. You can create a file to export like this:
Time spent on the tutorials and self paced learning will not be wasted. Also check out the three RULES that are
pinned to the forum for further guidance.
Start a new Sketch on one of the planes, Red Green is XY but any will do. Select the
Line tool and draw any triangle. I would suggest that your fist point is on the Origin.
Notice that the inside of the triangle is blue - this means that it is a Closed Shape.
Any Closed Shape will be blue and can be Extruded.
Also notice that the Lines of your triangle are blue and in the Browser tree on the
left hand side where it says Sketch there is a little Pencil icon. This means that your
sketch is NOT Fully Defined and Constrained.
To start Constraining your sketch, select the Dimension tool.
Highlight the bottom line of the triangle by hovering the mouse over it and it goes
Dark Blue, click andpull the mouse down a bit. This will set up a smaller line from
each end of that side of the triangle with a number in it. Make sure that this line is
Parrallel to the side of the triangle you are dimensioning. Click when it is where
you can see it and hit enter, or enter an exact value then hit enter.
You have now set the length of the bottom line of the triangle. You can change this
by clicking on it at any time. Everything is still blue but that is ok for now.
Still with the Dimension tool, highlight and select the line to the Right and click
to make the dimension, but this time instead of entering a value, click on the
value of the first line and it will change to d1, then hit enter. We have just created
a Parameter with the value of d1. It will be whatever the value of d1 is, so if we edit
d1 then both sides will change to that value.
One side left to do.
fx: 100.00 means that the length of side 2 is a parameter and is 100 long.
Now lets use a different parameter to finish defining our triangle. With the Dimension
tool, click on the bottom line and move the mouse to click on the 2nd line and then
move the mouse towards the third side. You should see an Angle dimension pop up.
Click it where you want it and set it to 60 degrees.
We now have an equilateral triangle floating in space, we now need to lock that down
and become fully defined. We are going to use a Construction Line to help us. Hit Esc
to get out of the Dimensioning tool and select the Line tool again. Click on the Origin
and draw a line more or less horizontal under the triangle about 150 mm long.
Click on the line so it goes dark blue and press the 'x' key and it will change to a
dotted line. This is a Construction line. We have already made it 150mm long so now
we need to Constrain it so it is useful. For some reason, fusion insists on construction
lines being fully constrained.
Hit Esc again and it will go Brown. Now we will constrain it. Select the Horizontal/Vertical
Constraint tool and click on our dotted line. It should turn Black and snap to the X axis.
Now lets define the angle between the base of our triangle and the x axis. Fire
up the Dimensioning tool and select the triangle base and our construction line
and set it to 15 degrees.
Notice that when we do this, ALL of our lines change to Black and the little icon
on the sketch in the Browser tree is now a little Lock. This means our sketch is now
Fully Constrained. This is a VERY important fundamental of fusion. Blue lines in
sketches should keep you awake at night.
Right. Finish our sketch. In the top right corner of the screen is a little View Cube.
Click on the little Home icon so we can see a different view of our sketch.
Now we are going to Extrude our shape into a solid. Choose the Extrude tool and click
inside the blue triangle we just made.
Extrude our triangle 5mm UP and make sure that the Extrude Panel says New Body.
We now have a triangular solid shape, 5mm thick and a new Body in our Browser
Tree. When you read the documentation you will find out the difference between
a Body and a Component, but for now this is fine.
Right, now we are going to cut a triangular hole into this shape. Create a new Sketch,
but this time select the upper face of the triangle solid you just extruded. Sketches
can be placed on Planes OR Faces - very handy to know.
The first thing we are going to do in our sketch is create some helpful data. We are
going to Project the shape of our triangular shape into our new sketch. We do this
by selecting the Project tool.
On the Projection Panel, click Bodies and then click onto out triangle shape.
Close the Projection Panel. Turn the little Eye icon on the Browser tree for our Body
to Off, and what you should have left is the outline of the triangle. Notice also that
our Sketch is Fully Constrained with a Lock.
Ok, fire up the sketch line tool and draw any old triangle you want INSIDE the big triangle.
Fire up the Parralel Constraint tool and click on the two bottom edges of the triangle
you have just drawn and the Projected triangle.
Hit Esc and fire up the Line tool and draw a Construction line from the top of the
projected triangle to the Mid-point of the bottom side. You can find the middle of the
bottom side by hovering your mouse over the bottom line, in about the middle until
the mid-point icon pops up. If it doesn't, hold down the Shift key while you do this
and the icon will pop up. Highlight the new black line and hit x to make it a Construction
line.
Now we are going to lock down our smaller triangle. Select the Co-incident Constraint
tool and click on the apex of the smaller triangle and the construction line. This will
make that apex snap to that line. Do the same with the mid-point of the bottom
of the smaller triangle too.
Right, almost done. Fire up the dimension tool and select the point of the apex of
each triangle and enter a value of 20. Make sure that you are parrallel to the
construction line and not on some angle. Dimension the base of the smaller triangle
to 20mm. Dimension the base of the two triangles.
Now the second sketch should turn fully black and the Lock icon appears next to
our sketch. Finish the sketch.
Hit Home on the View Cube.
Now lets cut the smaller triangle out of the bigger one.
Turn the visibility of the triangle shape back ON in the browser tree.
The sketch is on the top face. Now Extrude the small triangle, but this time we will
extrude DOWN and it will go RED because we are making a CUT in the Extrude Panel.
Hit Ok and now you have an extruded triangle shape with a smaller triangle cut from
the middle of it.
Now all you need to do is start reading the documentation, do all of the embedded
tutorials and do the Self Paced Learning and you will be on your way. Time spent
doing this is NEVER wasted.
Cheers
Andrew
