I use this method to make cones of a specific size, I mostly use it to make templates for metal or fabric.
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Step 1: Draw a Profile of the Cone You Want to Make
Draw a profile of the cone you want to make. I usually use card stock as it is a bit more durable, but use whatever you have around.
Step 2: Extend Cone, If Needed
If you drew a full cone please disregard
Step 3: Label Your Cone
Label the base A and B and the apex D. Or not is up to you
Step 4: Set a Compass
Set a compass to DB
Step 5: Draw an Arc
Using D as your center, draw an arc from B, make it longer than you might think
Step 6: Measure AB
Measure AB, mine was 1 3/4
Step 7: Multiply AB Times Pi
for me this was 1.75x3.14=5.495, I just rounded to 5.5
Step 8: Measure Arc
You want your arc to be the sum of ABxPi. In my case 5.5 inches, so I use a piece of string to measure it.
Step 9: Lay String on Arc
Lay string on arc and mark 5.5 inches
Step 10: Draw Line From Mark to D
For my cone it was from 5.5 along the arc to D
Step 11: If You Did Not Have a Full Cone
Set compass from D to top of cone
Step 12: Draw Top Arc
Connect the arc to the line
Step 13: Cut Out
I used scissors, but use what ever method works for you
Step 14: Full Cone
here is what a full cone would look like
Step 15: Truncated Cone
here is the truncated version
Step 16: Work the Paper
you might have to roll it around a bit to get it into shape. I mostly use for templates for fabric or metal so I dont worry too much at this point
Step 17: Ta Da
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