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All information and results from trials will be noted in the subpages.
Our Machine:
The machine we have in the bay is the Centroform EZFORM LV 1827 110V Tabletop Vacuum Forming Machine.
Features/Tips:
Uses a 110 -120 volt 1500 Watts (approximately 12.5 amps) heating element
A vacuum source is required - household vacuum/shop vac or a vacuum pump could work
The small brass outlet can be used for an electric pump to be for added suction
Both the suction sources can be used at the same time and the transition from one vacuum to the other will be automatic
If the brass outlet is not used be sure to cap it
The two handles on the sounds should be turned anti-clockwise to release and opposite to tighten
The mold should always be smaller then the platen by at least ½ to 2 inches from each side
The oven takes about 2-3 minutes to warm up
The plastic sheet should be placed into the frame
2-3 inches of sagging of the sheet is a good estimate of when it is ready
The plastic must be heated evenly, including all 4 corners, use a rounded stick or pencil on the corners to test
The mold should be either warm or at room temperature, keep it on the platen as the plastic heats for warmth
Turn on the suction sources and bring the frame down, the vacuum will force the plastic to be sucked over the mold
Wait for the plastic to be completely cold before pulling it off
If the mold and plastic are stuck together, compressed air can help (blow in between)
Beware that different plastics may heat differently, if a plastic starts to develop air bubbles, it has absorbed moisture and may need pre-drying before hand
Troubleshooting:
There a common problems that can happen:
Webbing ( plastic folds on itself):
Plastic might be too thin
Mold might be too detailed/awkward
Plastic might have stretched too much
Raise the mold by placing a wood cut out on the bottom
Too much vacuum could have been applied too fast - try to regulate the vacuum air or use only electric pump
Too many sharp corners/ shapes
Plastic not sucked over the mold:
Mold is too large or tall
Heat the plastic for longer or use a thicker plastic
Ensure adequate suction and no leaks
Not enough detail on the formed parts:
Drilling tiny (1/16 inch) holes in the mold in parts where the vacuum will have a hard time pulling can help
Make sure vacuum has no leak, check filter
Use thinner plastic or heat it longer