Controlling Tight Radius Tolerances
What are some tips for deburring medium-size steel parts while maintaining strict radius tolerances?
Q. We machine large quantities of a medium-size steel parts, creating sharp edges that need deburring. The radius on the print is 0.002 ±0.0005. How do we deburr this part in a vibratory process and hold the radius to these tolerances? —B.B.
A. Tight radius tolerances can be precisely controlled with a precision 4-mm round-ball, ceramic, fast-cut media. The round media shape produces a single-point contact on the part. This slows the process of edge deburring, therefore providing radius process and tolerance predictability with a given time cycle.
Small media also slow and help control the radius process. So the combination of the media’s round shape and small size will give you the control required for tight radius tolerances.
When choosing vibratory media, understand the size, shape, starting roughness condition and metallurgical structure of the part.
Immersion tin and lead-free hot air solder leveling (HASL) coatings based on SnCu or SnAgCu alloys are widely used as surface finish materials for printed circuit boards (PCB). These coatings prevent the underlying copper from corrosion and preserve its solderability during lead-free assembly processes and for a long storage life of PCBs.
The correct peripheral speed is an important consideration in getting the right results from your buffing operation. A buff that is turning too fast or too slow may result in damage to the buff or to the workpiece.