![]() The groove in the blade is concave to eliminate dirt build up and permit a free and easy slide for the heads. The blade is designed to allow the different heads to slide along the blade and be clamped at any desired location. The set consists of a blade(graduated rule), square head, protractor, and center head. The combination square set (Figure 1-18) is used for a number of layout operations. Do not attempt to adjust the sliding jaw while it is clamped to the upright beam.įigure 1-17. ![]() This scriber reaches below the gage base. Using height gage with carbide.įigure 1-17 illustrates the use of an offset scriber with the height gage. This marker is used to lay out lines on glass, hardened steel. Always be sure the bottom of the foot block (Figure 1-15) is clean and free from burrs.įigure 1-16 shows the height gage with a tungsten carbide marker. Like the vernier calliper, these height gages are graduated in divisions of 0.025 inch and avernier scale of 25 units for reading measurements to thousandths of an inch. Height gages are available in several sizes: the most common are the10, 18, and 24 inch gages in English measure and the 25 and46 cm gages in metric measure. The vernier height gage (Figure 1-15) is a calliper with a special foot block to adapt it for use on a surface plate. These plates are made of semi-steel or granite and should never be used for any job that would scratch or nick the surface. It is used in conjunction with surface and height gages as a level base on which the gages and the work piece are placed to obtain accurate measurements. A surface plate and combination square (Figure l-13) are needed to set the surface gage to the correct dimension.Ī surface plate (Figure l-14) provides a true, smooth, plane surface. The scriber can be positioned at any height and in any desired direction on the spindle by adjusting the scriber. The rocker adjusting screw provides for finer adjustment of the spindle by pivoting the spindle rocker bracket. The spindle may be adjusted to any position with respect to the base and tightened in place with the spindle nut (Figure 111) The gage can be used to scribe layout lines at any given distance parallel to the work surface (Figure 1-12).įigure 1-12. Obtaining center of a cylindrical work.Ī surface gage (Figure 1-11) is used for many purposes, butis most often used for layout work. It can also be used to locate the center of cylindrical shaped workplaces (Figure 1-10).įigure 1-9 Laying-out lines parallel to the edge of workpiece.įigure 1-10. The hermaphrodite calliper (Figure 1-8) is a tool used to layout lines that are parallel with the edges of the work piece(Figure 1-9). This layout tool is set in the same manner as the divider. The trammel can be made to scribe larger distances with the use of extension rods. The trammel is made of three main parts: the beam, two sliding heads with scriber points, and an adjusting screw that is attached to one of the heads. When scribing circles, arcs, and radii that are too large to be produced with the divider, a trammel should be used (Figure1-7). Using divider to lay-out equal maesurement.įigure 1-6. To set the divider to the correct length, place one point on an inch mark of a steel rule and open the divider until the other leg matches the correct measure-merit required (Figure 1-6).įigure 1-5. The divider cart be used to lay out and measure distances (Figure 1-5). The legs of the divider must be of the same length and be kept sharp. ![]() When laying out circles, arcs, and radii, it is best to use the divider (Figure 1-4). It is also used to check the trueness of the flat surface.Chapter 1: Introduction to the Machine shopĬhapter 2: Properties, Identification and HeatĬhapter 5: Milling, Drilling and Slotting Attachments The scriber point acts as a visual reference against which any variation in the workpiece can be judged. The scriber block may also be used in place of a dial indicator to detect run out (a variation in concentricity) of a workpiece mounted in a four-jaw chuck. The upright post can be adjusted to tilt back or forward, effectively moving the scriber point up or down in a controlled fashion coarse adjustments are made by sliding the scriber along its clamping block. The scriber block has pins that can be pushed to protrude through the base these can then be used as limit pins to allow the block to press against the edge of the table, controlling its movement in that plane. The workpiece is held against an angle plate so that it is perpendicular to the surface plate the scriber block is then adjusted to the required height and used to scribe a line parallel with the table, by sliding the block along the table's surface. See also: height gauge A scriber block or surface height gaugeĪ scriber block is used to lay out lines at a set height from the base, thus its second name surface height gauge or just surface gauge.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |