PALSUN Technical Guide

PALSUNTechnical ManualE. Finishing Recommendations for Well Done Sawing and Cutting:Unintended saw marks, rough or jagged corners, or uneven, drawn edges created by imperfect shearing mayresult in crazing and cracking, that can develop further to failure under load.We recommend finishing the edges of cut PALSUN sheets (or all types of plastics) by finishing the edges to asmooth appearance.This will ensure that no cracks will develop from the irregularities at the edges.Smoothing techniques are discussed in Section VII (page 23).F. Drilling:1. General Indications:Drill bits: Regular, new high-speed steel twist drills, or new carbide-tipped drills are suitable for drilling holesin PALSUN sheets of various thicknesses, as long as they are sharpened well. They areused mainly for bores up to 12 mm(1/2 “) diameter.Figure 14a: Regular drill bitFigure 14b: Flat chisel edged drill bladeγ οα οα ο β οLarger holes may be drilled by flat, chisel edged drill blades with a triangular cutting tip, similar to those usedin woodworking, kept always very sharp.Rake angle should be about 5° to avoid side friction. They are usedmainly for bores from 12 to 20mm (1/2 “ to 13/16 “).Commercially available cutting cups or circle cutters of several types can be used for performing large roundapertures.Speed: Decrease the drill’s speed as hole diameter and / or sheet thickness gets larger. Drilling speed may varydue to actual conditions.Feed rate: May vary due to actual conditions.Table 15: Drilling Speed and Feed Rate Change in Accordance with Bore Diameter.Hole Diameter Drill Speed Feed Ratein. mm in. rpm mm/rev in./rev1/81/413/3219/3225/32361015200.120.240.40.60.81500 - 1800800 – 1500500 – 1000350 – 700250 - 3500.03 – 0.070.03 – 0.070.01 – 0.070.070.070.012-0.0280.012-0.0280.004-0.0280.0280.02821