HRC70 Small-diameter end mill mostly adopts spring clip set clip method, which is in cantilever state when in use. During the milling process, sometimes the end mill may gradually protrude from the tool holder, or even fall completely, causing the workpiece to be scrapped. The reason is generally because the gap between the inner hole of the tool holder and the outer diameter of the end mill holder There is an oil film, resulting in insufficient clamping force.

HRC70 Small-diameter end mill is usually coated with anti-rust oil when it leaves the factory. If non-water-soluble cutting oil is used for cutting, a misty oil film will also adhere to the inner hole of the tool holder. When there is an oil film on the tool holder and the tool holder , the tool holder is difficult to firmly clamp the tool holder, and the end mill is easy to loose and fall off during processing. Therefore, before the HRC70 Small-diameter end mill is clamped, the shank of the end mill and the inner hole of the tool holder should be cleaned with cleaning fluid, and then dried before clamping.
When the diameter of the end mill is large, even if the tool holder and the tool holder are clean, the tool drop accident may still occur. At this time, the tool holder with a flat notch and the corresponding side locking method should be selected.
Another problem that may occur after the HRC70 Small-diameter end mill is clamped is that the end mill is broken at the tool holder port during processing. The reason is generally because the tool holder has been used for too long and the tool holder port has been worn into a cone. , and a new tool holder should be replaced at this time.