1. OUTSIDE DIAMETER. The outside diameter is the diameter of the cylinder passing through the peripheral cutting edges.
2. ROOT DIAMETER. The root diameter is the diameter of the circle passing tangent to the bottom of the fillet.
3. SIDE TOOTH LENGTH. Length of the raised land along the side tooth. Required to calculate the number of resharpenings available and the modification possibilities.
4. CUTTER FACE WIDTH. The cutter face is the surface at the side or end of the cutter body which is perpendicular to the axis of the cutter. The distances between the two faces of plain, helical and side milling cutters, or the length of the outside diameter cylinder is the cutter width, if small, or cutter length,with respect to the diameter.
5. TOOTH FACE. The tooth face is that surface of the cutting tooth against which the chip is forced in the metal cutting operation.
6. LAND. The land is that part of the back of the tooth adjacent to the cutting edge which is relieved to avoid interference between itself and the surface being machined. A raised land permits numerous resharpenings before a secondary clearance has to be ground.
7. CUTTING EDGE. The cutting edge is the intersection of the face of the tooth with the leading edge of the land.
8. FLUTE. The flutt, is the chip space between the back of one tooth and the face of the following tooth.
9. RELIEF ANGLE. The peripheral relief angle is the angle between the surface formed by the land and a tangent to the cutter outside circle passing through the cutting edge in a diametral plane. It is to prevent the land from rubbing on the surface of the work being cut. Relief and clearance are measured in degrees or in radial fall in inches at a certain specified distance back of the cutting edge on the land. For this latter measurement, a dial indicator may be used to measure the radial fall in thousandths of an inch from the outside or cutting edge diameter back of the cutting edge.
10. RADIAL RAKE ANGLE. The radial rake angle of a milling cutter is the angle formed in a diametral plane between the face of the tooth and a radial line passing through the cutting edge. This may be positive, negative, or zero degree.
11 AXIAL RAKE ANGLE OR HELICAL RAKE. When a milling cutter has helical teeth, that is, when its cutting edge is formed along a helix about the cutter axis, the resulting rake is called helicall rake. If the cutting edge is straight, its rake is axial rake. The axial rake or helical rake angle is the angle formed between the line of the peripheral cutting edge and the axis of the cutter, when looking radially at the point of intersection. This applies in the case of helical mills, half-side mills, staggered tooth mills, face mills, and metal slitting saws having face cutting edges.
12. GASH DEPTH. Gash depth is the distance from the outside diameter of the cutter to the fillet radius or root diameter.
13. FILLET RADIUS. The fillet radius is the curved surface at the bottom of the flute which joins the face of one tooth to the back of the tooth immediately ahead.
14. DISH OR CONCAVITY. The progressive decrease in cutter width from the periphery toward the center.
15. RADIAL OFFSET. The radial offset of a milling cutter is the physical dimension that a tooth is behind (for positive rake) or ahead (for negative rake) of a center line drawn parallel with flat, tooth face. It is calculated by multiplying the sine function of the radial rake angle times the radius of the milling cutter.
16. DEPTH OF RECESS. The distance from the cutting edge on the land of the side tooth (or the hub which is the same width as the cutter) to the recess is the depth of recess. This dimension is required to determine width and angle modification limits.
17. HUB DIAMETER. The hub is the raised ground section between the bore and recess. It is the same width as the cutter. Collar spacers butt adjacent to the hub for holding and spacing of the cutter on the arbor. The hub diameter dimension is required to determine the allowable depth or cut and clearance between cutter and workpiece.
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WIDTH-DIAMETER RANGE. The economical range for modification of a standard cutter.
CLEARANCE ANGLE. The clearance angle (peripheral) is the angle between the surface back of the land which forms part of tire back of the tooth and a tangent (line perpendicular to the cutter radius) passing through the cutting edge. The back of the tooth may consist of a smooth curve in which the clearance back of the land is variable from point to point, or it may be made up of the land and one, two, or more straight lines, in which the smallest clearance angle back of the land is called the primary clearance angle, the next smallest is called the second clearance angle, etc.
AXIAL RUNOUT. The total variation in an axial direction of a cutter element from a true plane of rotation.
INTERLOCKING. Mating cutter sections on which side teeth project to mesh with the adjacent cutter section providing cutting edge overlap.
SETTING IN (NESTING). The axial overlapping of cutters of different diameters without the use of interlocking projections
FORM CUTTER. Any cutter, profile ground or form relieved that is shaped to produce a specified form on the work.
FORM RELIEVED CUTTER. Cutters which are so relieved that when resharpened they will cut the specified form on the work throughout the life of the cutter. They are sharpened by grinding the faces of the teeth only. The relieved surfaces may be unground or ground. Flat, curved or irregular surfaces may be produced by form relieved cutters.
PROFILE GROUND CUTTERS. Relief is ground on the land directly behind the cutting edges. Flat, curved or irregular surfaces may be produced by profile ground cutters.

الموضوع الأصلي : Cutting Tool Geometry  المصدر : منتديات اصدقائى تو