The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . or, as shown in Fig. 59. Large work may be clampedto the adjoining floor-plate, and is planed by the travel ofthe planer on its railway. This powerful machine has abed-length of thirty-eight feet, and will plane to a widthof almost nine feet. Its uprights are sixteen feet high,and it is driven by a long belt carried under the ceiling. Slotting machines are sometimes built like planers,though the more common form has a tool that receives anup-and-down motion from a crank-wheel. A chain
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . or, as shown in Fig. 59. Large work may be clampedto the adjoining floor-plate, and is planed by the travel ofthe planer on its railway. This powerful machine has abed-length of thirty-eight feet, and will plane to a widthof almost nine feet. Its uprights are sixteen feet high,and it is driven by a long belt carried under the ceiling. Slotting machines are sometimes built like planers,though the more common form has a tool that receives anup-and-down motion from a crank-wheel. A chain slot-ting machine has been recently introduced that has a seriesof cutters mounted on an endless chain. It is chieflyuseful for such wood-work as mortising door-frames. Thegear-cutting machine is a form of slotter, since it shapes thecogs and spaces. This machine has been brought to a highdegree of perfection. Though the teeth of a gear must bevery accurate in form, and every change in size of thewheel or in the number of the teeth involves a change inthe form of each tooth, yet gear-cutting machines are. MACHINE TOOLS. 251
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