Out on the forming machine itself. Normal sheet temperatures are in the range of 170°C-225°C for mechanical and vacuum forming. Optimum forming conditions depend upon part design, draw ratio, sheet thickness and the forming technique employed. However, the following basic rules still apply:. Forming at low temperatures gives the best hot. The thinner the material, the smaller diameter the vacuum hole. Usually 1mm diameter holes for materials up to 2mm, and 1.5mm diameter for materials above 2mm in thickness. Materials below 1mm may require 0.75mm or less diam- eter holes, if you want to minimise any witness marks.
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