Plastic Tumbling Media (Tetrahedron Shape)
We can also make other size vibratory deburring media that not show in the table, so please contact us to get detail information
1. Why tetrahedron shape plastic tumbling media
1.1 Prevent Lodging
Tetrahedron shaped media has another name of TET shape, and it used in various parts deburring and smoothing. Also it is almost the most used plastic media. Because it allows partially to enter holes of various diameters without lodging problems. An example is aluminum machining parts with various holes and slots.
1.2 More contact area compare with cone shape
The photo above shows two different shape of media – one is cone and another is TET shape. Comparatively, if you want to achieve most planar contact between parts and media, then pyramid shape is a better idea. The pyramid shape have 4 triangle flat surfaces. However, Cone shape only have 1 planar surface, which make it less possibility to make the parts to media contact in same period of time.
2. Plastic tumbling media general information
2.1 Plastic tumbling media composition:
Plastic tumbling media is preformed plastics, the other workhorse media, are also available in a variety of grades or bodies, with some manufacturers having nine grades while others have as few as three.
We make plastic media mixing bonding abrasives (generally 40-70% by weight) into polyester, usually by casting. After casting, manufacturer pre-tumble the media to remove flash. Because the plastic media is softer, has a lower density than preformed ceramic media, provides a cushioning effect, and sometimes has a shorter life.
2.2 Plastic Tumbling Media Advantage
Three areas exist in which plastic is really better than ceramic:
- Large size tumbling media is important to prevent lodge in, however, ceramic media may risk to scratch parts;
- Plastic tumbling media prevent delicate parts damaging ;
- Plastic tumbling media create a smooth surface for pre-plating or pre-anodizing finish
It is well suitable for finishing softer metals and fragile parts, achieving pre-plating requirements, and producing smooth finishes as low as 5 micrometers. During finishing the matrix which is softer than the abrasive, is eroded, leaving the abrasive to perform the desired work.
While some users believe it assures parts free of impingement, this is not true, All the mass finishing processes expert for fixed or compartmentalized operations allow part-on-part contact. We can make plastic media in various shape according to parts requirement. In practice over a decade some shapes go out of favor and new ones emerge.
Inovatec noted that the plastic tumbling media provides no surface hardening of the parts. In addition, plastic media is also quieter than abrasive chips.