CUTTING TOOLS AND STANDARD ACCESSORIES END MILLS
End mills are the standard vertical mill cutting tools. We recommend 3/8" shank end mills held in the 3/8" end mill holder P/N 3079. One of the benefits of 3/8" end mills is they are available in a large range of sizes. The end mill is held with a set screw on its flat surface and it can be easily changed. They are also lower in price than miniature cutters because of their popularity. You can also use miniature series end mills having 3/16" or 1/4" shank sizes which should be held in collets. (End mills held in collets must be single ended, while end mills held in our end mill holders may be double ended.) We recommend using 2-flute, high-speed steel end mills for aluminum because the flutes are less prone to clog with chips. Use 4-flute cutters for cutting steels with lower RPM. The solid carbide tools are not suggested since they are very expensive and the cutting edges will chip unless used with heavy duty production equipment.
FIGURE 12-A typical end mill
As a convenience to our customers, SHERLINE keeps in inventory many of the popular sizes of end mills which are appropriate for use on our machines. See tooling price list for selection. End mills may also be purchased from your local industrial machine shop supply outlet (see yellow pages under "Machine Shop Supplies") or from mail order industrial suppliers.
Because small diameter cutters (less than 1/8") are quite fragile, the largest diameter cutter possible for the job requirements should be employed. Be certain that the RPM is appropriate before attempting to remove any metal. An end mill can be instantly damaged if a cut is attempted at excessive RPM. Like all cutting tools, end mills will have a short lifespan when used for machining steel or other exotic materials. Save new cutters for finish work. Do not use small diameter end mills with long flutes unless absolutely necessary because of excessive cutter deflection (bending).
RESHARPENING END MILLS
End mills can be resharpened by your local tool and cutter grinding shop. End mills lose their cutting edge clearance after a couple of sharpenings and should no longer be reused.