3nero wrote:Looking Good so far. I was thinking of a similar design before i built mine. Maybe my next build... (nearly finished one and already thinking about my next one)
We do a lot of acrylic bending in work, it's not too hard to do but it does take practice to get it right. First off make sure you are using cast acrylic and not extruded. The cast is usually more expensive. The best way to tell the difference is to cut a scrap piece with some kind of power saw. The cast stuff will have a nice smooth cut, the extruded will be all fuzzy and may even re-weld itself back together before the cut is done.
You can use a blowtorch or a heat gun to heat the plastic , either way you must not spend too much time in one spot or the plastic will bubble and burn. we're talking seconds, 2 seconds with a torch will burn and about 4 with a gun. Just keep moving back and forth until the plastic starts to get shiny and warp, then lose the heat and push the bend by hand. Also make sure you have your hand wrapped in about 4 layers of towel or oven gloves ( but only if you are fond of having skin). hold the shape until the plastic has cooled back down.
You need to have some kind of former made to lay the plastic on so it takes the shape you want. Wood is best but it needs to be sanded smooth or the plastic will pick up any imperfections. also don't press to hard with the cloth or the plastic will pick up the thread pattern from it.
The thicker the sheet you are using the longer you need to heat it. but heat it to long and it will bubble up. Also it's better to use an oversized piece because the edges where it bends usually warp a bit so you cut them off afterwards. Just practice with some scraps first until you figure out how much time you can spend on it with the heat and you should be fine. But once the piece is bent its bent, re-heating a second time will cause bubbles and burning.
One last thing, Make sure the sheet is spotlessly clean before you heat it, any dirt or grease will burn into the plastic.
It's really not that hard to do but it does take a little bit of practice to get to know the how the plastic handles when heated.
Here's a pic of one of our models with lots of bent acrylic going on...
22 years bending plastic and it still take me 2 or 3 tries to get it right
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