Mechanical Drawing Self-Taught. Joshua Rose

Mechanical Drawing Self-Taught - Joshua  Rose


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Use of the triangle to divide circles 129 Scales giving the length of the sides of polygons 135 To find what a square body which measures one inch on each side measures across the corners; to find what diameter a cylindrical piece of wood must be turned to which is to be squared, and each side of which square must measure an inch 136 To find a radius across corners of a hexagon or a six sided figure, the length of a side being an inch 138 To draw a stud 142 To pencil in a cap nut; pencilling for a link having the hubs on one side only 145 Link with hubs on both sides; pencil lines for a double eye or a knuckle joint 146 Double eye or knuckle joint with an offset; a connecting rod end 147 A rod end with a round stem 148 A bolt with a square under the head 149 Example in which the corner where the round stem meets the square under the head is sharp; a centre punch giving an example in which the flat sides gradually run out upon a circle, the edges forming curves 150 CHAPTER VIII. SCREW THREADS AND SPIRALS. Screw threads for small bolts with the angles of the thread drawn in, and the method of doing this 152 A double thread; a round top and bottom thread such as the Whitworth thread; a left hand thread; to draw screw threads of a large diameter 156 Drawing the curves for screw threads 157 To draw the United States standard thread 160 To draw a square thread 162 Form of template for drawing the curves of threads 165 To show the thread depth in a top or end view of a nut; to draw a spiral spring 166 To obtain an accurate division of the lines that divide the pitch 167 CHAPTER IX. EXAMPLES FOR PRACTICE. A locomotive spring; a stuffing box and gland; working drawings of a coupling rod; dimensions and directions marked; a connecting rod drawn and put together as it would be for the lathe, vise, or erecting shop 169 Drawings for the blacksmith 172 A locomotive frame 174 Reducing scales 175 Making a drawing to scale 177 CHAPTER X. PROJECTIONS. A spiral wound around a cylinder whose end is cut off at an angle 178 A cylindrical body joining another at a right-angle; a Tee for example 180 Other examples of Tees 181 Example of a cylinder intersecting a cone 186 A cylindrical body whose top face if viewed from one point would appear as a straight line, or from another a circle 188 CHAPTER XI. DRAWING GEAR WHEELS. Names of the curves and lines of gear teeth 193 How to draw spur wheel teeth 194 Professor Willis' scale of tooth proportions 195 The application of the scale 197 How to find the curve for the tooth face 198 To trace hypocycloides for the flanks of teeth 200 Sectional view of a section of a wheel for showing the dimensions through the arms and hub 202
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