Basic question about vac-forming?

[Birdie]

Does the plastic being formed need to be considerably bigger than item being replicated?

For example if I have a 16x10 vacuum table, can I vac-form a 15.5x9.5 model?

Total newb to this, so any advice appreciated

 

[swgeek]

It depends on a few factors, Male/female mold, plastic thickness and amount of draw (how deep or tall the part is). But in general it is best to have an inch or two surrounding the part.

 

[exoray]

Does the plastic being formed need to be considerably bigger than item being replicated?

For example if I have a 16x10 vacuum table, can I vac-form a 15.5x9.5 model?

Total newb to this, so any advice appreciated

The answer really depends on the depth of the pull, for a very thin part like a sign possibly, for a helmet or something probably not...