Drilling in Plastic Without Cracking the Material
When working with drilling in plastic, consider the unique properties of each material. We offer a range of plastics, like HDPE, UHMWPE, POM-C, and PA6G, and each requires its own drilling technique.
Drill Bits and Geometry
One of the most common challenges when drilling in plastic involves avoiding cracks. This is because plastic can be brittle and break if subjected to excessive stress or improper handling. When choosing a drill bit for drilling in plastic, you must consider the geometry. For example, the point angle, that's the angle between the drill bit's tip and its side, matters a lot. A point angle that's too large can cause cracks, while one that's too small can cause the drill bit to get stuck.
Another important factor is the lip angle, the angle between the drill bit's edge and its side. A lip angle that's too large can cause the drill bit to \"grab\" too much material, leading to an uneven surface.
Speed and Material
When drilling in various plastics, adjust the speed to the material's properties. For example, HDPE requires a relatively low speed, while POM-C can handle a higher speed. We've compiled a list of recommended speeds for various materials:
- HDPE: 100-300 rpm
- UHMWPE: 50-200 rpm
- POM-C: 200-500 rpm
- PA6G: 300-600 rpm
Peck Drilling for Deep Holes
When drilling deep holes in plastic, it can be hard to avoid cracks or the drill bit getting stuck. A solution to this problem is peck drilling. This means making short, shallow drillings at regular intervals to let the material \"breathe\" and relax. Peck drilling can also help improve surface quality and reduce the risk of cracks.
Cooling Requirements
When drilling in plastic, it may be necessary to cool the material to avoid overheating and cracks. For example, you can use a coolant, such as water or oil, to keep the material cool during drilling.
Common Mistakes
When drilling in plastic, it's easy to make mistakes that can lead to the material cracking or the drill bit getting stuck. For example, you might use a drill bit that's too old or worn, or drill too fast or with too much force. Another common pitfall is not considering the material's properties and adjusting the drilling technique accordingly. For example, PMMA and PS are brittle materials that require special handling.
Want to know more about how you can improve your drilling technique and avoid common mistakes? Take a look at our website to read more about our products and services.
Drilling in Plastic Without Cracking the Material