CAMT Machine Calibration & Process Parameters Flashcards
6 cards from real CAMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CAMT Machine Calibration & Process Parameters flashcards as text
What is the purpose of annealing FDM-printed parts made from semi-crystalline polymers such as PEEK after the build is complete?
Answer: To relieve residual thermal stresses and increase crystallinity, improving mechanical properties
Post-build annealing of semi-crystalline FDM polymers like PEEK relieves residual thermal stresses from rapid layer cooling and promotes crystallization, significantly improving tensile strength and dimensional stability.
In directed energy deposition (DED) additive manufacturing, what does 'standoff distance' refer to and why is it controlled?
Answer: The distance between the deposition head and the workpiece surface, controlling melt pool geometry
Standoff distance in DED is the controlled gap between the deposition nozzle or laser head and the substrate surface, which directly affects melt pool size, deposition bead geometry, and heat input.
Why does the cooling rate during laser powder bed fusion solidification significantly affect the mechanical properties of metal parts?
Answer: Rapid cooling rates produce finer microstructures and may create metastable phases with different properties than wrought equivalents
The rapid solidification rates in LPBF produce fine grain structures and can create metastable phases in certain alloys, resulting in mechanical properties that differ substantially from cast or wrought versions of the same material.
How does oxygen content in the build chamber affect metal additive manufacturing processes such as LPBF and DED?
Answer: Even trace oxygen causes oxidation of the molten metal, creating inclusions and porosity that degrade part properties
Metal AM processes require inert atmospheres (argon or nitrogen) because even trace oxygen reacts with reactive molten metals to form oxide inclusions and surface films that create porosity and reduce mechanical properties.
What is the purpose of using separate 'contour' scan parameters from 'fill/hatch' scan parameters in laser powder bed fusion?
Answer: Contour scanning uses optimized lower-power parameters at part edges to improve surface finish and dimensional accuracy
Contour scanning uses specifically optimized lower power and slower speeds to precisely define part boundaries, producing better surface finish and dimensional accuracy at edges compared to the higher-power fill scan used for the interior.
How does layer thickness selection in powder bed fusion directly affect the 'staircase effect' on angled and curved surfaces?
Answer: Thinner layers reduce the magnitude of the staircase effect, producing surfaces with better dimensional fidelity
The staircase effect on curved and angled surfaces is directly proportional to layer thickness; thinner layers produce smaller steps and smoother apparent curvature, but significantly increase total build time.