Showing posts from 2015

Something you should know for CNC PCD Tipped Inserts

Edge Hone: The edge hone is by far the most commonly used edge preparation. Many inserts are automatically provided with an edge hone at the time of purchase, especially larger inserts that will be exposed to heavy cutting. An edge hone on a ground or precision insert must usually be specially requested. It is standard practice of all manufacturers to hone inserts that are to be coated before the inserts are subjected to the coating process. The reason for this is that during the coating process, the coating material tends to build up on sharp edges. Therefore, it is necessary to hone those edges to prevent build-up. "L" Land: The "L" land edge preparation adds strength to the cutting edge of an insert. Essentially, the "L" land amplifies the advantages of negative rake by diverting a greater amount of cutting force into the body of the insert. An "L" land is normally used only on negative, flat top inserts placed at a negative rake angle. T

New PCD Turning Inserts for aluminum


Slugger CNC PCD Turning Tools Inserts-Various Angle in Diamond cutting tools

                              Various Angle in Diamond cutting tools         Since the birth of the indexable insert, all turning tool holders were manufactured with 5º negative rake angles in both directions. Later this became the ANSI and ISO industry standard. It would be interesting to find out what the reasons were and why that was done.       In the 1980’s several research labs ran tool life tests comparing various degrees of negative rake angles. They all came to a same conclusion that, an increase of the negative rake angles increases tool life.       As we all know, negative turning inserts have 90º sides. This also means that an increase of the top rake will increase the side clearance angle. An increase of the side clearance will absolutely increase tool life. The following sketch uses a .010” wear land criterion and compares a 5º top rake angle to a 10º.  The theoretical result is that, the 5º rake has .0009” wear life compared to the 10º rake with .0018”. The 10º ra

CNC Diamond PCD and CBN Turning Inserts

                     CNC Diamond PCD and CBN Turning Inserts PCD is formed in a large High Temperature-High Pressure (HT-HP) press, as either a diamond wafer on a backing of carbide, or forming a "vein" of diamond within a carbide wafer or rod. PCD is no good for cutting steels for similar reasons, except substitute carbon (what diamond is made from) for nickel. That's why diamond is pretty much exclusively used for non-ferrous/fiberglass/composite materials. Oddly, it is still able to be used and recommended to cut carbon fiber.  PCD is for any speed, period, in nonferrous materials. It will leave a good finish at low surface speeds, and it won't break down at ridiculous speeds (10k+ sfm). It also lasts much longer than any other type of insert, usually orders of magnitude longer. PCBN is made by high pressure high temperature sintering of cubic boron nitride with a binder pahase, and there are mainly tow groups of binders, namely metal binder a