![]() I have used many Vac-froming machines my favorite material to form in is styrene as it is the most forgiving.ĪBS is a stronger plastic but it has a lot of moisture in it that you need to remove before forming as it will leave tiny craters on the surface as the water explodes out of the sheet. ![]() Perspex is a lot harder and more care is needed during the heating to prevent the plastic from burning. Typical sheets are 2400mm x 1200mm (8 x 4 feet), therefore making the rig work with 400mm x 400mm or 600mm x 600mm make more sense.įoam based plastics like ABS or HIPS are the easiest to form. ![]() What this usually results in is making a smaller platen to economize the plastic being used. Adding a rubber seal around the rim can help. I am also working on female tools, but that is another story.Īs mentioned, your plastic (and frames) should be larger than the platen itself so that the plastic can make full surface contact with the platen. Raw MDF is a common material to make a platen from, but I discovered it fails at just 6"HG where the air is sucked through the material so I will be fiber glassing mine. A vacuum cleaner will pull a max of 6"Hg. SEAL: One you create a seal, you should not be able to break it whilst the vacuum is on. And you need the entire surface at that temp for best results. ![]() HEAT: Your heater needs to be able to heat the surface of the plastic to at least 130 degrees C. The most common issues with vacuum forming fails are heat and suction.
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June 2023
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