A text-book of dental histology and embryology, including laboratory directions . iedfossils, rocks, etc. This consists of an aluminum diskfitted to the lathe head, and surrounded by a special formof spatter guard that admits of the use of the peripheryfor cutting, and an object holder fixed upon the slide restof the lathe. The object holder consists of a clamp thatgrasps a brass tube slotted at the free end in which teeth,or other objects may be made fast with plaster of Paris orsealing wax for slicing. Or in place of this a brass man-dril, upon the end of which there is a threaded nippleby w
A text-book of dental histology and embryology, including laboratory directions . iedfossils, rocks, etc. This consists of an aluminum diskfitted to the lathe head, and surrounded by a special formof spatter guard that admits of the use of the peripheryfor cutting, and an object holder fixed upon the slide restof the lathe. The object holder consists of a clamp thatgrasps a brass tube slotted at the free end in which teeth,or other objects may be made fast with plaster of Paris orsealing wax for slicing. Or in place of this a brass man-dril, upon the end of which there is a threaded nippleby which any of the grinding disks may be are fixed in the position of the ordinary tool post, 476 APPENDIX CHAPTER I and may be swung horizontally to any possible positionin relation to the aluminum disk. An object can there-fore be so placed on the disk as to be cut in any directiondesired. Usually these are fixed upon the disk with sealingwax. In using the aluminum disk it is fed with carborundumpowder suspended in soapy water to give it some stickiness. Fig. 348. Figs. 348 and 349.—Arrangement for slicing very hard material. Fig. 348 is the moreordinary view of the machine with the slide rest and object holder in position. InFig. 349 the lathe is turned about to give a better view of the slide rest, object holder,spatter guard, and aluminum disk. In these illustrations the slotted tube i3 used(see text) to hold the object being cut. Notice that the disk used for cutting is sur-rounded by a spatter guard which is open for a space at one side so that the peripheryof the disk may be used in cutting. This guard gathers all water and grit used incutting, and delivers it into the pan below through its hollow post. When doingthis kind of work all of the bearings of the machine should be carefully wrapped(swaddled) to keep them safe from intrusion of grit. This is applied with a brush by hand, and is kept going soconstantly as to prevent the disk from running dry. Theo
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Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
