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Topic: 3d printing? the thing that should keep film alive?
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted October 09, 2017 07:58 PM
Conventional parts manufacture is usually performed by what is known as a subtractive process, where the part is formed by removing material from a larger piece of metal or plastic. 3D fabrication is an additive process, where the part is made by forming successive layers of the part. In between these two are castings and moldings which usually use the exact amount of injection material required for the part.
The quality of a 3D plastic part depends on the number of layers. A crude part will have just a few layers whereas a high quality part may have hundreds of layers. Plastic parts are much easier to fabricate in 3D than metal parts, because typically plastic parts are not required to carry high loads and therefore the molten plastic material used to form the layers is often close enough in physical properties to do the job. The same is not true for metal parts which often have to carry high loads, have high hardness, and have surface finishes measured in microinches. Examples of this are metal gears, cams, and linkages.
No doubt in time, 3D printing will be perfected even for these kind of parts, but as far as I know, it's not there yet. This is why Edwin has offered, so far, only replacements for existing plastic parts on film projectors.
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