R 408.10105 Definitions; S to W.

Rule 105. (1) "Shoulder grinding" means a periphery grinding operation where a limited amount of grinding with the side of the wheel may be performed. (2) "Snagging" means the grinding which removes relatively large amounts of material without regard to close tolerances or surface finish requirements. (3) "Surface feet per minute" or "sfpm" means the distance in feet that any 1 abrasive grain travels in l minute on a peripheral surface of a rotating grinding wheel. (4) "Surface grinding" means the precision grinding of a plane or formed surface. (5) "Tool or cutter grinding" means the precision grinding or sharpening of various types of cutting tools. (6) "Tuck pointing" means the removal, by grinding, of mortar, cement, or other nonmetallic material. (7) "Wheel types" means the classification of abrasive wheels as listed in the following order: SHAPE TYPES OF GRINDING WHEELS Type 1 – Straight wheel Peripheral grinding wheel having a diameter thickness and hole. Type 2 – Cylinder wheel. Side grinding wheel having a diameter, thickness and wall — wheel is mounted on the diameter, or a similar wheel mounted in a chuck or on a plate. Type 5 – Wheel, recessed one side. Peripheral grinding wheel having one side straight or flat and the opposite side recessed. A recessed wheel allows a wider faced grinding wheel to be used when the available mounting thickness (E) is less than the required overall thickness (T). The recess allows grinding clearance for the nut and flange. Type 6 – Straight-cup wheel. Side grinding wheel having a diameter, thickness and hole with one side straight or flat and the opposite side recessed. This type, however, differs from Type 5 in that the grinding is performed by the wall (W). The wall dimension (W) takes precedence over the diameter of the recess as an essential intermediate dimension to describe this shape type. NOTE: Arrows indicate grinding surface. Type 7 – Wheel, recessed two sides. Peripheral grinding wheel having both sides recessed to allow grinding clearance for both flanges or recessed so that an unusually wide faced wheel may be mounted when the available mounting thickness (E) is less than the overall thickness (T). Type 11 – Flaring-cup wheel. Side grinding wheel having a wall flared or tapered outward from the back. Wall thickness at the back is normally greater than at the grinding face (W). Type 12 – Dish wheel. Side grinding wheel known as a dish, differing from a Type 11 in that Type 12 always has a (U) dimension. The (W) dimension of a Type 11 becomes the (A) dimension of a Type 12. The grinding may be performed by the (U) face. Type 13 – Saucer wheel. Peripheral grinding wheel known as a saucer, differing from a Type 12 in that the cross-section is equal throughout (U=E). The face is always half-round with R=U/2. SHAPE TYPES OF GRINDING WHEELS CONES AND PLUGS On all cones and plugs grinding is performed by all surfaces except the flat (dimension “D”) on the mounting side. These shapes normally have a blind hole threaded bushing for mounting. Type 16 – Cone, curved side. Curved sided cone with a radius nose sometimes referred to as “Bullet shape.” Type 17 – Cone, straight side, square tip. Cone with a straight side, square tip. Type 18 – Plug, square end. Plug – Cylindrical in shape with a square end. Type 18R – Plug, round end. Plug – Cylindrical in shape with a radius nose. R=D/2 Type 19 – Plugs, conical end, square tip. Combination cone and plug with a square tip similar to Type 17 and the Cylindrical portion similar to Type 18. The cylindrical portion (S) is normally equal to or greater than the depth of the blind hole threaded bushing (B). NOTE: Arrows indicate grinding surface. RELIEVED AND/OR RECESSED WHEELS A relieved side is a depression in the side of the wheel which is tapered from a radial flat at the periphery (A) to an inside flat (K) or recess diameter (P). Type 20 – Wheel, relieved one side. Peripheral grinding wheel having one side straight or flat and the other side relieved to a flat. Type 21 – Wheel, relieved two sides. Peripheral grinding wheel having both sides relieved to a flat. Type 22 – Wheel, relieved one side, recessed other side. Peripheral grinding wheel having one side recessed and the other side relieved to a flat. Type 23 – Wheel, relieved and recessed same side. Peripheral grinding wheel having one side straight or flat and the other side relieved to a recess. Type 24 – Wheel, relieved and recessed one side, recessed other side. Peripheral grinding wheel having one side recessed and the other side relieved to a recess. Type 25 – Wheel, relieved and recessed one side, relieved other side. Peripheral grinding wheel having one side relieved to a flat and the other side relieved to a recess. Type 26 – Wheel, relieved and recessed both sides. Peripheral grinding wheel having both sides relieved to a recess. Type 27 – Wheel, depressed center. Portable Grinding: Grinding normally done by contact with work at approximately a 15° angle with face of wheel. Cutting-Off: When used as a cutting-off wheel, the periphery is the grinding face. Type 28 – Wheel, depressed center (saucer shaped grinding face). Portable Grinding: Grinding normally done by contact with work at approximately a 15° angle with face of wheel. NOTE: Arrows indicate grinding surface.