How to use a hot glue gun
So.. You just bought a hot glue gun, and you think it is just a piece of cake using it?
Well, it is actually an artform :)
Seriously; Step one, before you start ruining your hard to get robot-parts, is to take your hot-glue gun, some sticks and a cutter, and then practice what I call "Mounting i free air":
Hold something where you want it.. And then you just cut wood, and glue it on below as support, until .. let's say the motor you wanted to be placed there, in free air - has something to be supported on / glued on to. And then you glue it on :)
You can be really creative with a glue gun and sticks, anything can be placed anywhere in 3D!
What I spend most time on, is holding the parts up in free air.. Sometimes even take pictures of it, and evaluate. When I know where I want something, I just "mount it in free air" :)
It takes a while for the glue to cool down, but this is your friend.
Anything can be glued, apart from alloy!
Practice these 7 technics as the first thing (do not skip this part, you will regret it):
- Dropping a drop of glue down where you cannot reach, between 2 sticks. Practice dropping it at the side, so it runs down in place.
- After adding glue, and it is not by dropping, always press out the amount you want.. and then by a fast pull / jerk with your arm (make sure no kids in the background) - you pull the gun away. The faster, the thinner the inevitable string of glue from what you where gluing to the gun. Leave the string there till the glue is cooled down, do not start "pulling it", it never stops, and you make a mess.
- Water on your finger prevents glue from sticking, and if it is not too hot, also prevents you from burning your finger. You want to try this; Mount something in an angle. Drop some glue down, let it run down the side, and end up in the angle / corner. Dip your finger in water, and when the glue is cooled enough off, round the corner / shape the glue.
- Get the feeling of this: Fresh, warm glue sticks, is fluid enough to run into little holes. Shortly after this, it makes a crap gluing if you press it down holes, it will look as if it is gluing parts together, but after some time they fall apart. Only really hot glue works.
- Wait way longer than you think; The stuff is VERY warm when it comes out, and the bigger your "drop" is, the longer it takes for it to really harden. So make sure you do hold on to what you are gluing, till the glue is so cold that you do not see a slow collapse that you will have to save. Sometimes you will have to wait 3-5 minutes, just holdin, while it cools down.
- Many plastics melt almost at the same heat as the melted glue can come out with. Be aware that if you add a large drop of glue on a piece of plastic, there is a great chance for it to deform! A case to hold a motor with gears inside is not a nice thing to deform, even the smallest bit will ruin it.
- Mount with VERY fresh / hot glue (Straight from the pistol), but do it in several rounds if you need large drops. A tiny small, long strip along the edges of to parts will dry fast, and hold things in place. Then - when it is cooled down - add a similar tiny stri and so forth. Tis is also the way ahead if you are afraid of melting plastic, and it makes it much easier to mount difficult parts, as the first little drop is all you need to hold it in place.. And then you can completely encapsulate the parts by adding multiple layers.