CBN Inserts - Wenza - cbn insert

2024-08-20 08:46:53

Radius Milling Cutter

Plain milling cutters are chiefly used to make flat surfaces; they do this by cutting chips of metal from the surface of the workpiece. Plain milling cutters come in a variety of sizes; on the ones that have helical teeth, the helix can vary in number of degrees, up to as much as 60° or even more. The helix-type cutter produces a smoother surface.

There are a wide variety of arbor-mounted cutters. They are used with the horizontal mill. Let’s look at some different kinds of arbor-mounted cutters:

c. Angular milling cutters: An angular milling cutter has teeth that are at an angle to the cutting axis (the horizontal axis of the arbor); they are neither parallel nor perpendicular to that axis, but are at some other angle.

Milling cutter tool

Angular cutters come in a variety of sizes and angles; some have teeth only on one side of the cutter; others have teeth on both sides. Some of the uses of an angular

Irma: Now put these spacers and this bearing bushing on the arbor too: They’re going to hold the cutter in place on the arbor.

Indexable Side Milling Cutter

Irma: . The first thing is to mount the cutter on this arbor. Use that helical plain cutter. And be careful you don’t cut yourself…so use this shop rag to pick up the cutter.

e. Metal slitting saws: A metal slitting saw is a circular saw which is fitted onto an arbor and used to cut off pieces of metal, as, for example, when a workpiece is cut off from the rest of the stock.

Slitting saws have a dish-shaped profile to prevent them from binding in the cut. There is a safety hazard in the use of the saw because of the possibility of the blade shattering under heavy use. To use the slitting saw safely, machinists should run the saw at a much slower rate than for other cutters; also they should not tighten the arbor nut as much nor should they lock the blade onto the arbor.

All the others parts of a milling machine are for the sake of the cutters: the table lifts the workpiece into the cutter; the knee lifts the table; the spindle rotates the arbor or shank that turns the cutter, etc.

Shell EndMillCutter

Horizontalmilling cutter types

a. Plain milling cutters: A plain milling cutter is a cylinder of tough steel with cutting teeth on the periphery. They can be of two styles:

1. Arbor-Mounted Cutters: This type of cutter is shaped like a wheel with a round hole in the center. It is threaded onto an arbor and is held in place by spacers and bearing bushings and by a nut which is tightened at the end of the arbor; the other end of the arbor is then inserted into, and driven by, the spindle.

Staggered Tooth Milling Cutter

EndMillCutter

b. Side milling cutters: A side milling cutter is a wheel-shaped piece of steel with cutting teeth on its periphery and on its side or sides. Such cutters are usually narrower than the plain milling cutter. The teeth on this cutter can be straight or staggered; the staggered type has teeth which are set in alternate positions on the right and the left side of the cutter.

d. Formed cutters: A formed cutter has cutting teeth on its periphery which are used to cut special shapes, e.g., (I) a concave-shaped cutter will cut a convex shaped ridge, (2) a convex cutter will cut a U-shaped groove, and (3) a third shape can be used to cut gear teeth.

Lee: Sure. I learned those in VESL class. That’s an angular cutter. ‘Those two are formed cutters. That’s a straight side cutter and there’s another one with staggered teeth. It also looks like you have two or three different slitting saws.

Note: In previous lessons you have studied different kinds of milling machines. In this lesson you will study the different kinds of milling cutters; the cutters are very important, because they are the parts that finally cut and shape the parts that the company makes and sells.