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How to Make A Sewing Machine Cake Internal Structure
There are a lot of "how to make a sewing machine cake" articles out there, but I couldn't find one that showed the internal structure and wasn't made of rice krispies. I made a sewing machine cake recently and took photos beforehand of the structural parts of it.
The electronic machines today are different from older models, in that the better machines are pretty enclosed. The tops are smooth and the thread is all on the inside. The last two cakes that I've made were specific brands, so they don't have the thread spool on the top of the cake. If you wanted to change to one of the older models you could just add the spool on top, the basic internal supports would stay the same.
The basic structure is cake on the base, cake on the side, cake on the top, and styrofoam or something else for the needle housing part. Since that's the part that hangs down it would be structurally unstable to have that made from cake too. You can attach the non-cake part either by hot gluing it to the bottom of the board, or by wrapping it with tape, which is what I did.
So I'm going to give you the internal structure, and you can take it from there.
Start with two greaseproof support boards, both 13" long. One should be 6" wide and the other about 4 1/2" wide.
Cut three plastic dowels to 7" long. It's important that they're all exactly the same length and flat so that they stand up without wobbling.
The dowels will go between the two boards, with the narrower board on the top and the wider board on the bottom. If you're not going to be moving the cake from place to place you can use a wooden dowel for the single one, since that's the end that has the needle and the presser foot and should be narrower. The wider support will be more stable, though.
The part that hangs down from the upper board can be made from styrofoam or oasis. You could make it from rice krispie treats coated with melted chocolate, but why bother? It will be more stable with something that's more solid. The oasis gives you the advantage of being easy to carve into shape, but it also tends to be more difficult to stick the fondant to later in the process, so it's a trade-off. Attach that to the upper board by hot glue for styrofoam or using packing tape, which is what I did in this situation since hot glue doesn't stick to oasis very well.
Make a hole in the center of the oasis and insert one of the dowels all the way through it. If you're using styrofoam this could be a difficult step, so you might have to carve out the styrofoam a little before inserting the dowel to get it started.
This is how it's going to go together. See how the part that hangs down is now going to be the needle housing part?
Cut another board that's 6x5", and mark on it where the dowels in the back will go through. I was using the tape and extra oasis to make sure the board was going to fit through the dowels and the legs were going to be flat on the top and bottom boards.
When you stack the cake, dowel the righthand side of the bottom cake even though it's only one layer. Put the smaller board on top of that, then put the two dowels through the holes. Put two layers of cake on top by pushing them down over the dowels. you can trim off the sides to make sure that they're even later. At this point you just want to get the cake stacked high enough to make a level top section.
Get the layers stacked, then cut them off level with the plastic dowels. The top support will sit right on top of that and the front leg should support the board on the left and make a flat surface for the top cake. Put a couple of wooden dowels into the cake to provide support between the top board and the 5x6" board that supports the cake on the right side.
Stack two layers of cake on top and carve it down into the shape of the machine you're making. For this cake I used two 9x13 cakes and had just enough to piece the cake together. If you don't want to do as much piecing you could start with three 9x13 cakes.
So that's the internal structure, and you can take it from there, If you wanted to cover the styrofoam section with fondant or modeling chocolate BEFORE putting the upper cake on it it might be easier to handle in the long run, but you can do it either way.