February 27, 2025
Additional information
Instructions for the use of spiral drills
In principle, each material requires a different drill. However, in practical everyday use, it is not always possible to use or keep different drills for each material. Often, a compromise is sufficient, as approximately suitable drills are adequate in many cases. However, the twist and point angle should be chosen carefully, as the quality of the drill holes is significantly influenced by these two values. The cutting speed depends not only on the material to be drilled but also on the drill diameter. For clarity, only 4 drill diameters are specified; for intermediate sizes, corresponding cutting speeds should be chosen between the specified values.
Additional tips:
You do not need the included adapter when using STAR-M circular cutters. However, it is useful if you want to use other drilling tools.
Total length 95 mm
Shaft diameter 10 mm
Drill chuck 10 mm
Depth of drill chuck 44 mm
Total length 95 mm
Shaft diameter 10 mm
Drill chuck 10 mm
Depth of drill chuck 44 mm
Safety
Steel drills can also be used for tough-elastic plastics:
PE (Polyethylene)
PP (Polypropylene)
PS (Polystyrene)
Brass drills are suitable for brittle plastics:
PVC (Polyvinyl chloride)
PMMA (Polymethyl methacrylate)
Brass drills can also be used for bronze and magnesium alloys.
Before drilling, a small indentation should be made in the workpiece with a center punch to provide a starting point for the drill, which would otherwise wander on the surface. This is due to the cutting edge of the spiral drill. The punched indentation should be slightly wider than the cutting edge so that the main cutting edges can engage. For larger drills (from 8 mm), it is advisable to pre-drill with a smaller diameter.
Place or clamp thin sheets on a wooden base to prevent them from bending under pressure.
Reduce pressure before drilling through, with special caution when using hand-held drills, as they can bind and fly out of your hand.
PE (Polyethylene)
PP (Polypropylene)
PS (Polystyrene)
Brass drills are suitable for brittle plastics:
PVC (Polyvinyl chloride)
PMMA (Polymethyl methacrylate)
Brass drills can also be used for bronze and magnesium alloys.
Before drilling, a small indentation should be made in the workpiece with a center punch to provide a starting point for the drill, which would otherwise wander on the surface. This is due to the cutting edge of the spiral drill. The punched indentation should be slightly wider than the cutting edge so that the main cutting edges can engage. For larger drills (from 8 mm), it is advisable to pre-drill with a smaller diameter.
Place or clamp thin sheets on a wooden base to prevent them from bending under pressure.
Reduce pressure before drilling through, with special caution when using hand-held drills, as they can bind and fly out of your hand.