Question

A prototype of a part is to be fabricated using stereolithography. The base of the part is shaped like a right triangle with dimensions 36 mm by 48 mm. In application, the part will stand on this base. The height of the part is 30 mm. In the stereolithography process, the layer thickness = 0.15 mm. Diameter of the laser beam spot = 0.40 mm, and the beam is moved across the surface of the photopolymer at a velocity of 2200 mm/s. Compute the minimum possible time required to build the part, if 25 s are lost each layer to lower the height of the platform that holds the part. Neglect the time for setup and post-processing.

Answer 1

Given that the part should be osiented on its side in the stereolith graphy, thus the layer area Al is the same for all layers ni = 0.5% (bh) = 0.5X ( 36X48) - sou may Time to Complete one layer Ty is same for all layers. et lost time Spot size x velo corty Soy + 25 0.4 x 2200 = 25.985 - t I Number Oy number of layeS = Menyeso - thickness 30 0.15 200 .: Minimums possible time required will be - Te = n TE = 200 X 25.98 = 5196 sec / 5To = 104.43 br The minimum possible time required to build the part will be l.uusbrs