CHAPTER 3 | PART DESIGN GUIDELINES Wall Thickness (mm) C o o li n g T im ( S c ) 40 35 30 25 20 15 10 0 1 2 3 4 ABS PC Nylon 6/6 Figure 2 - Designing for Wall Thickness Changes Bad Better Recommended Recommended Poor High Stress Ideal Figure 3 - Internal and External Radius Guidelines .5W Min Inside Rad + W Poor High Volume FIGURE 1 - Wall thickness vs. cooling time of various plastics FIGURE 2 - Designing for wall thickness changes FIGURE 3 - Internal and external radius guidelines Design Guide 9 RIB DESIGN GUIDELINES The minimum distance ribs should be spaced is three times the nominal wall thickness (3W). The graph in Figure 6 shows the maximum amount of displacement versus the height of the rib. Figure 6 shows how the rib creates a thick region within the part.

50400MSH RUSSELL PURPLE NYLON MESH 42000MSH DALLAS SCARLET NYLON MESH PP FR 8-6 LMS-1000

BLUE FR NYLON NYLON 6,6- BRASS PP FR 8-6 LMS-1000

88888MSH NYLON YELLOW 19888MSH MSH NYLON BLACK PP FR 8-6 LMS-1000

GUN METAL NYLON COYOTE TAN NYLON PP FR 8-6 LMS-1000

Plasticomp Nylon - V2 UV/AO Plasticomp Nylon - V1 UV/AO PP FR 8-6 LMS-1000

98888MSH NYLON FLUORESCENT YELLOW 68889MSH NYLON BLUE PP FR 8-6 LMS-1000

LT PURPLE GF NYLON MED PURPLE GF NYLON PP FR 8-6 LMS-1000

UV WHITE NYLON NYLON LT BLUE PP FR 8-6 LMS-1000

NYLON YELLOW RAL1021 NYLON YELLOW CONC. PP FR 8-6 LMS-1000