Well, I'm not an artisan, neither I do it for my profession, but my grandmother was going to celebrate her eightieth birthday and I wanted to make an unforgettable gift! So I searched here in Instructables and found this piece of gold at this link - https://www.instructables.com/id/Copper-Rose-Perfect-for-Valentines-Day/ - I reccomend for you to read Sanjay's instructable too, because it is very good!
I followed his steps but copper is pretty expensive here in Brazil and I wanted to learn more about aluminum. So, let's start!
Step 1: Get the Sheet and Cut It!
You'll need a scissor to cut the sheet metal. For each rose you will need 3 square pieces measuring 75 x 75mm and one rectangular piece of 37 x 75mm (just the half of a square piece).
You need to drill a 4.5mm hole in the center of the sheet. I didn't trace the center, because it is artistic and you don't need so much precision. Moreover, if you make the pieces slightly different from each other, your rose will have a "more natural" aspect.
Step 2: Cut the Petals!
For the four-petal squares:
-> Cut the four middle divisions
-> Chamfer the four external corners
-> Chamfer the eight internal corners.
For the two-petal rectangles:
-> Cut the two middle notches to allow bending
-> Chamfer the four external corners.
Step 3: Annealing the Petals
Annealing consists basically on heating the metal up to (literature says) 300-400ºC and letting it cool down to the air.
This step was hard for me, because I don't have a torch and I didn't want to have one, because I don't know very well how to operate it... So I figured out that the best heat source that we all have in our home is the stove!
Caution! I advise you (even though I didn't use) to wear leather gloves while handling hot parts and fire! Do as I say, not as I do!
To start, you will need nearby:
-> A stove (obviously!!)
-> Our base material
-> A place to leave the material cool down after heating
-> A pair of pliers
-> A can of water (to refrigerate the pliers)
-> A piece of cloth to dry the pliers
Take a piece of aluminum with your pliers and put it over the fire, slowly moving around to keep the heating homogeneous. Flip it once or twice for a good heat distribution. It takes one minute (or less, depending on your stove) to reach the temperature needed. If you make it too long, your sheet will become blurry and rough. The next step is dripping! So be careful, because you don't want it to drip on a gas exit hole of your stove...
Leave your part over a wood (or even better - stone) stand to cool down. In less than 15 minutes it will be very cool and you can go on! Put your pliers into the water can for a while to cool them, so you can restart the process for the other petals.
Step 4: Cutting the Stem
It doesn't matter what you use. You need a rod of 4mm diameter, because we are going to cut an M4 thread in the next step. The lenght you need to cut is something like 35cm.
I filed the tip to make an invitation for the die. Also, I had to file the perimeter to reduce from 4,75mm (original diameter) to 4mm.
Step 5: Cutting the Stem's Thread
-> a vise
-> an M4 die
-> Cutting oil
-> Two M4 nuts
-> Patience (hehe!)
We need something like 20mm of threaded rod. I think the pictures are pretty explanatory.
Step 6: Putting It All Together
Now comes the interesting part. The first petals to be bent are the rectangle ones. Be careful here! You have to bend them in order to occupy the least space in the base (after bent). This way, you will allow space for the next petals to be bent. Otherwise, your rose will look too much opened, because the last petals will form an angle greater than 180 degrees.
While bending the petals, do not forget to do the effect that creates the "artistic finishing" to the product: With a fine pair of pliers, take the edge and bend it outwards (to the opposite side that you bent the petal). This way, you will create a little "dent" on the edge. Repeat this procedure all over the entire edge of all the petals. Each time you bend a petal, do it. Takes time and work, but is pretty worth it!!
Step 7: Painting
Step 8: Enjoy!
I hope you liked it! If something is unclear please feel free to ask questions, I will try my best to help! Thank you very much!