Drilling into plastic without cracking the material
When drilling into plastic, it is important to take into account the unique properties of each material. We offer a range of different plastics, such as PE-HD, PE-1000, POM C and PA6G, and each of these requires its own drilling technique.
Drill bits and geometry
One of the most common challenges when drilling into plastic is avoiding cracks. This is because plastic can be brittle and break if subjected to excessive stress or mishandled. When selecting a drill bit for drilling into plastic, you must take the geometry into account. For example, the point angle, that is, the angle between the drill bit’s tip and its flank, is very important. A point angle that is too large can cause cracks, whilst a point angle that is too small can cause the drill bit to jam.
Another important factor is the rake angle, the angle between the drill bit’s cutting edge and its flank. A rake angle that is too large can cause the drill bit to ‘take’ too much material, resulting in an uneven surface.
Speed and material
When drilling into different plastics, you must adjust the speed according to the material’s properties. For example, PE-HD requires a relatively low speed, whilst POM C can be drilled at a higher speed. We have compiled a list of recommended speeds for different materials:
- PE-HD: 100 to 300 revolutions per minute
- PE-1000: 50 to 200 revolutions per minute
- POM C: 200 to 500 revolutions per minute
- PA6G: 300 to 600 revolutions per minute
Peck drilling for deep holes
When drilling deep holes in plastic, it can be difficult to avoid cracks or the drill bit becoming stuck. One solution to this problem is peck drilling. This involves making short, shallow drill holes at regular intervals to allow the material to ‘breathe’ and relax. Peck drilling can also help to improve surface quality and reduce the risk of cracks.
Cooling requirements
When drilling into plastic, it may be necessary to cool the material to prevent overheating and cracking. For example, a coolant, such as water or oil, can be used to keep the material cool during drilling.
Common mistakes
When drilling into plastic, it is easy to make mistakes that can cause the material to crack or the drill bit to jam. For example, you might use a drill bit that is too old or worn, or drill too quickly or with too much force. Another common pitfall is failing to take the material’s properties into account and adapt your drilling technique accordingly. For example, PMMA and PS are brittle materials that require special handling.
Would you like to know more about how you can improve your drilling technique and avoid common mistakes? Take a look at our website to find out more about our products and services.
Drilling in Plastic Without Cracking the Material