Pattern Making; A Practical Treatise Embracing the Main Types of Engineering Construction Together with the Methods of Estimating the Weight of Castings to Which Is Added an Appendix of Tables for Workshop Reference (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 edition. Excerpt: ...lines in Figs. 277, 278 are the pattern lines, the inner ones represent the planed sizes. Make the fillet to section (Fig. 279), planing the straight portions, and cutting the curved parts round the gap with gouge and chisel, and nail or screw in place (Fig... w-, 273, a, a; Fig. 275, J, J).-z"Jf'"-l J The strips, D, d, d, round 'the gap must, however, be wired on. The two facings for the standards, 5 b inches by 3 inches fftpk, by i inch (Fig. 273, c, e), w tfty complete the pattern. rigs. 277, 278, 279. For the first core (Fig. 273, plan), frame up a box 1 foot 5 inches by 4 inches by 5f inches (Fig. 280). This is long enough to include the first and second ribs, and deep 'i.Ufa ) enough to include the print. Plane two strips 1 foot 5 inches by If inch by inches, equalling respectively length of box, depth of inner strip and print, and width of inner strip with planing allowance, and screw them against the sides of this box flush with its top edge (Fig. 280, A, A). Prepare two cross-bars inch thick to the shape and dimensions indicated in Fig. 281, which represents a section of the box, looking towards the end, and screw in place (Fig. 280, B, B). Prepare a piece 4 inches by 3 inches by inch, and fasten at one end for the standard facing (Fig. 280, c). The next box is framed to 1 foot 4 inches by 4 inches by 5$ inches, and one end is made to follow the outline of the pattern (Fig. 282). In the end next the gap, a cross-bar similar to the others, but 3 inches deeper, is fixed (b). The guide strips, A, A, for the poppet, as in the last box, will be required. The box for the third core (Fig. 283) will be 8 inches by 4 by 5-, having strips, A, A, cross-bars, B, B, and facing, c, for standard; or the second box may be utilised after its core...