Dumping research links… write up coming…
Designs and Builds
- Instructables: Make A Good, Cheap, Upgradeable Sheet Plastic Vacuum Former - great write up on the “one hole” method
- RCGroups: hole sizing and spacing- 1/16" diameter on 1/2" spacing, but later comments recommend the “one hole” approach. Also to put buck on blocks- so vacuum can get under the buck.
Emissivity numbers are often an “average” across a (wide?) range of temperatures. Can be quite a range. Look for specific emissivity for target temperature.
Conductivity is also influenced by temperature? (Note- I don’t mean the temperature differential, need to look up if conductivity is average temperature dependant.)
Material Tips and Tricks
- Can you Vacu-form PET-G with the protection covering? – No
- put buck on (small) blocks
- consider adding holes through buck so vacuum can get “through”, especially in low areas
- break off piece of steel from aluminium sheet
- paint it black, both sides
- try: mounting air oven in top box, with aluminium sheet “sealing” it. Idea is that black paint will make it absorb and emit better than bare Al, and the sheet will spread the heat out to be even. See if it get’s hot enough…