The FDM Process
Fused Deposition Modeling (FDM) is a rapid prototyping methodology which extrudes semi-liquid ABS plastic material to fill a cross section of the part. A temperature-controlled head extrudes thermoplastic material layer by layer. The designed object emerges as a solid three-dimensional part without the need for tooling.The process begins with the design of a conceptual geometric model on a CAD workstation. Cybernet take this model and mathematically slices the conceptual model into horizontal layers .01" thick. Support columns are added as necessary. After generating the toolpaths, the path data is then downloaded to the FDM system. The system operates in the X, Y and Z axes. In effect, it draws the model one layer at a time.
Thermoplastic modeling material, ABS, feeds into the temperature-controlled FDM extrusion head, where it is heated to a semi-liquid state. The head extrudes and deposits the material in ultra-thin layers onto a fixtureless base. The head directs the material into place with precision. The material solidifies, laminating to the preceding layer.
FDM parts can be used for functional testing as well as for form and fit testing. ABS prototypes have 85% of the strength of an actual molded part you can mark, sand, paint, tap, or drill them. You can even install and run them, for the best proof possible that a design really works.
The FDM machine can build parts up to 10 x 10 x 10 in (254 x 254 x 254 mm) with an accuracy of ±.005 in (±.127 mm).
The FDM 1650 Machine
FDM MODELING MATERIALS SPECIFICATIONS
| P400 ABS | |
| Tensile Strength (psi) | 5,000 |
| Tensile Modulus (psi) | 360,000 |
| Elongation (%) | >10.00 |
| Flexural Strength (psi) | 9,500 |
| Flexural Modulus (psi) | 380,000 |
| Notched Impact (ft*lb/in) | 2.00 |
| Unnotched Impact (ft*lb/in) | 24.00 |
| Hardness (Shore D) | 78 (D) |
| Softening -- Vicat or Point R&B (°F) | (V) 220 |
| Specific Gravity (gm/cm3) | 1.05 |