| 单词 | mandrel |
| 例句 | He uses only his hands, cast-iron mandrels, wood patterns, lathes and other machinery inherited from his grandfather. Florida craftsman's diving helmets are jewels of the sea 2014-06-19T04:00:00Z A bit of the wire of proper length is first doubled and then by a special contrivance the two ends are bent around a mandrel so as to form an insertion point or loop. Directions for Collecting and Preserving Insects 2012-03-28T02:00:31.483Z Indeed, if these holes f have been accurately bored, a neatly fitting mandrel passed through them should hold the side frames true. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The mouth of the bottle is ground by a revolving iron cone, or mandrel, fed with sand and water and driven by steam. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 "Gichtel, Johann" to "Glory" 2012-01-11T03:00:20.463Z A. If the saw is not true or the carriage runs crooked, end play of the mandrel to the extent of the deviations will relieve the strain upon the saw. Scientific American, Vol. XXXVII.?No. 2. [New Series.], July 14, 1877 A Weekly Journal Of Practical Information, Art, Science, Mechanics, Chemistry, And Manufactures 2012-01-05T03:00:29.743Z The two lifting rams are made long enough to pass through holes in the top casting, and thus form guides to the crosshead and mandrel. Scientific American Supplement, No. 648, June 2, 1888. 2011-12-26T03:00:15.410Z This is removed and allowed to set, thus giving a paper shell just fitting the mandrel. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z In this case two set-screws must be used one on each end of the pulley hub, so as to steady the pulley on the mandrel. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z It would seem, however, that a revolving tool was supported by a kind of mandrel, and actuated in primitive fashion by a bow. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z But if the carriage runs true and the saw true, the mandrel should have no end play. Scientific American, Vol. XXXVII.?No. 2. [New Series.], July 14, 1877 A Weekly Journal Of Practical Information, Art, Science, Mechanics, Chemistry, And Manufactures 2012-01-05T03:00:29.743Z This large upward force is required for stripping the tubes off the mandrels, in addition to raising the main ram crosshead, etc. Scientific American Supplement, No. 648, June 2, 1888. 2011-12-26T03:00:15.410Z The tube, after vulcanising, is slipped on to a wooden mandrel and cut into rings on a lathe. The Preparation of Plantation Rubber 2011-03-09T03:00:40.870Z As c must be removed from the arbor or mandrel every time the saw is changed, the wear on its thread is great, and in time it becomes loose, which impairs its accuracy. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z This could be done by forcing a tightly-fitted arbor M, having accurately-centered ends, into the bushing and inserting the mandrel and work between the lathe centers h and h1 as shown. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. His inventiveness took various directions, amongst other fruits being an improved rotary engine, a compensating governor for the steam engine, and a screw tap, drill, and mandrel. Scientific American, Vol. XXXVII.?No. 2. [New Series.], July 14, 1877 A Weekly Journal Of Practical Information, Art, Science, Mechanics, Chemistry, And Manufactures 2012-01-05T03:00:29.743Z The mandrel should be made slightly conical in order to facilitate withdrawal. A Handbook of Laboratory Glass-Blowing The four-motion feed was actuated in this machine by means of a spring bar and a cam in conjunction with the mandrel. The Invention of the Sewing Machine With the last of these mandrels in the hole the hub was drawn out to length and diameter, leaving the forging roughly shaped, but having the form shown in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Pipe Center The cone arbor or mandrel shown at A, in Fig. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. They are made either by the moulding process, or by wrapping sheets of rubber compound around metal mandrels. The Automobile Storage Battery Its Care And Repair The mandrel is then forced in by the hammer until its lower edge has passed through the hoop. Scientific American Supplement, No. 488, May 9, 1885 A small flat mandrel being introduced into the hose, the new rivets are put into the leather, and riveted up the same as new pipe; the mandrel is then shaken out at the end. Fire Prevention and Fire Extinction The next process was to put in a bar mandrel such as shown in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z This type is particularly desirable for large work, owing to the greater pressure required for inserting mandrels that are comparatively large in diameter. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. The shell to form the central chamber is attached to a mandrel, and the metal forced into a mould around it. A Refutation of the Charges Made against the Confederate States of America of Having Authorized the Use of Explosive and Poisoned Musket and Rifle Balls during the Late Civil War of 1861-65 They are cut from solid ingots, and those for guns up to 24 centimeters are rolled like railway tires; those for larger calibers are forged on a mandrel. Scientific American Supplement, No. 488, May 9, 1885 The leather is then put over the worm, and the rivets being put into one side, a small thin mandrel is laid over the canvas and the rivets struck down upon it. Fire Prevention and Fire Extinction The wings e f may then be closed on the mandrel to their proper width and the whole hub end being trimmed by hand, all the previous work having been done under the steam hammer. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z In this case, the casting would also be held by pressing a mandrel through the hub; as shown. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. Into these openings a row or “gang” of thin circular saws project mounted upon a revolving mandrel. Textiles For Commercial, Industrial, and Domestic Arts Schools; Also Adapted to Those Engaged in Wholesale and Retail Dry Goods, Wool, Cotton, and Dressmaker's Trades The blows are then made to operate on the upper edge, detaching it from the mandrel. Scientific American Supplement, No. 488, May 9, 1885 The projecting ends of the mandrel are supported to allow the worm to lie quite clear. Fire Prevention and Fire Extinction This may be done by driving in a taper steel mandrel, and then clinching them over, or by using a tube expander. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z This mandrel should run true on its centers, as otherwise the outside surface of the piston will not be true with the bored hole. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. Finally the tube is bound round the mandrel with sufficient force to bring it to the proper shape and boiled in water, mandrel and all. On Laboratory Arts This is done by boring a hole 1 inch deep in the center of the block, into which the mandrel is driven. Electricity for Boys One end of the mandrel has a check, that the brass joint may not prevent the worm from lying flat on the mandrel. Fire Prevention and Fire Extinction The following table gives the ordinary diameters and thicknesses of circular saws and the diameters of the mandrel hole: Diameter. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z After the reaming operation, the casting is removed from the chuck and a taper mandrel is driven into the hole for turning the outside of the piston. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. A wooden mandrel is prepared of the proper size and shape. On Laboratory Arts The saw is put on the mandrel at an angle, as will be seen, and should be run at a high rate of speed. Practical Mechanics for Boys If the small mandrel be not used the heads of the rivets are apt to lie unequally on the worm. Fire Prevention and Fire Extinction Before hanging a saw on a mandrel, it is necessary to know that the mandrel itself runs true in its bearings or boxes. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Plate XXV, which shows the telegraph and telephone lines, with the expanding mandrels used in laying them. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 If very accurate spools are needed the mandrel is better made of iron or slate and the spool is turned up afterwards. On Laboratory Arts The next step would be to turn out a bore and fit a mandrel into it. Practical Mechanics for Boys Is there any practical and effective method known for cutting screws by connecting the slide rest with the mandrel of the lathe by gears or otherwise? Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. The saw arbor or mandrel is carried by the main frame, and is therefore rigidly held. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The form and details of the expanding mandrel which was finally designed to meet the conditions, and proved so satisfactory in every way, are shown by Fig. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 For this purpose take the mandrel out of the lathe, and place it nose downwards in the centre of an iron ring of proper diameter on a flat and level iron plate. On Laboratory Arts Lathe Speeds.—Do not make the too common mistake of running the mandrel at high speeds in your initial tests. Practical Mechanics for Boys The cylinder and piston are made from mandrel drawn brass tubing, which may be purchased in any desired quantity in New York city. Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. The lead is cast on and turned upon the mandrel, the metal in the flute c driving the lead. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z One of these mandrels was placed in each line of single ducts and two in each 4-way duct, placed diagonally, as shown in Fig. 1, Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 The lens is adjusted until the image remains steady on rotating the mandrel and it is to give time for this operation that a slow-setting cement is recommended. On Laboratory Arts This mandrel is held in position by means of the posts of the frame which carry the split journal bearings. Carpentry for Boys In a Simple Language, Including Chapters on Drawing, Laying Out Work, Designing and Architecture With 250 Original Illustrations This device consists of a mandrel carrying at one end the cutter and at the other end a large pulley. Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. These two pieces are then placed together, or rather side by side, on an arbor or mandrel, with the pin of the one fitting into one of the holes, as a. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z This required 60 mandrels at each working point, or 240 for the whole work. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 The discs are made by pouring lead round the screw-nose of the mandrel. On Laboratory Arts This form of bearing will make a durable lathe, free from chattering, as the bolts can be used for tightening the mandrel whenever they wear. Carpentry for Boys In a Simple Language, Including Chapters on Drawing, Laying Out Work, Designing and Architecture With 250 Original Illustrations This mandrel is journaled in a hinged frame supported by a block replacing the tool post, and is adjusted as to height by a screw passing through an arm projecting from the supporting block. Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. When a grooved mandrel is used, its diameter should be slightly less than the required diameter of spring, as when released the coils expand in diameter. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The 4-way conduits were generally laid in the ordinary way, except that no laying mandrel was necessary. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 Place the disc of iron or lead on the lathe mandrel or in the chuck, and set the slide rest so that it is free to slide up or down the lathe bed. On Laboratory Arts In that case your mandrel will revolve 960 revolutions per minute, which is ample speed for your purposes. Carpentry for Boys In a Simple Language, Including Chapters on Drawing, Laying Out Work, Designing and Architecture With 250 Original Illustrations The jacket was made by coiling a bar over the mandrel in a spiral, then hammering the coils into a welded cylinder. Artillery Through the Ages A Short Illustrated History of Cannon, Emphasizing Types Used in America If it is not essential that the coils be exactly true, take a plain mandrel, such as shown in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z When a line was finished, two mandrels were placed diagonally in each line and expanded simultaneously, so that any inequalities in the ducts themselves were divided as far as possible. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 The disc is, of course, mounted on the mandrel, and the work on the slide-rest. On Laboratory Arts A substance of any kind interposed, as, for instance, a wearing surface between a mandrel and its bearing. Carpentry for Boys In a Simple Language, Including Chapters on Drawing, Laying Out Work, Designing and Architecture With 250 Original Illustrations The loose mandrel C is provided with a spigot on the lower end, which fits the hole in the differential-case hub. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel On the live centre d is a clamp for securing the work or mandrel holding dog. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z In connection with the use of these mandrels, one of the points which was most carefully watched was that they projected back into the last completed section, thus insuring the continuity of the alignment. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 This method is very handy with small lenses; the mandrel is turned, and the lens adjusted by hand till the images are immovable. On Laboratory Arts The mandrel is driven by belt from a cone pulley of three faces, which gives the proper speeds for different sized bits. Scientific American, Volume XXIV., No. 12, March 18, 1871 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. The bags are also to be tried on mandrels, or formers, made according to the dimensions given on the preceding page. Ordnance Instructions for the United States Navy. 1866. Fourth edition. At one end of the screw arbor, or mandrel was a small brass circle f, having its edge divided into 60 parts, numbered at every sixth division, as before mentioned. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The mandrel used in the final rodding was made as shown at G, Fig. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 This is best done on a lathe with a hollow mandrel.. On Laboratory Arts The mandrel which carries the chuck is made to traverse by a foot lever, so as to bore any depth up to twelve inches. Scientific American, Volume XXIV., No. 12, March 18, 1871 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. Into the hole thus made insert a square mandrel about four inches, driving it lightly; by wrenching it, a portion of the shell of the bouching can be detached and removed by unscrewing. Ordnance Instructions for the United States Navy. 1866. Fourth edition. At k is a cone mandrel such as has been described with reference to lathe work upon which is chucked a cross-head c. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The lines were rodded in both directions from alternate manholes, thus avoiding uncoupling the rods and allowing every pull to be effective in pushing the mandrel through the ducts. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 It may then be placed upon the mandrel and turned true, and it is well enough to make it a little thinner in the middle than at the periphery. Scientific American Supplement, No. 312, December 24, 1881 The traversing mandrel is of the best quality of steel, and the machine is otherwise made of iron in a substantial manner. Scientific American, Volume XXIV., No. 12, March 18, 1871 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. The bands are then milled upon the outside by a process called profiling, drilled for the rings, placed upon mandrels to insure the exact shape required, filed, polished, case-hardened, and thus finished. The Atlantic Monthly, Volume 12, No. 72, October, 1863 To support the outer end of the cone mandrel a beam l is bolted to the two tables e, e. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Wooden rods were used at first, but proved entirely too light, as the mandrels used were a close fit, and it required considerable effort to push them through 400 ft. of conduit. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 In this case a table similar to the saw table before described is supported in a vertical position, and arranged at right angles with the cutter mandrel. Scientific American Supplement, No. 312, December 24, 1881 For example, the rubber is squirted out of a mammoth tubing machine in the shape of a huge tube, then slipped on a mandrel and vulcanized. Scientific American Supplement, No. 841, February 13, 1892 "Hello!" he said to himself, "those mandrels here." The Brimming Cup These two carry a mandrel d, to which is fastened a face-plate d′ against which the work is chucked. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Connection at Head End may be dispensed with, if the mandrel is threaded through ducts by rods attached to the trailing end. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 The saw mandrel is supported between the centers of the lathe, and the saw projects more or less through a slot formed in the table. Scientific American Supplement, No. 312, December 24, 1881 The old fashioned way of making jar rings was first to take a large mandrel and wrap it around with a sheet of compounded rubber until the thickness of the ring was secured. Scientific American Supplement, No. 841, February 13, 1892 Rings and tubes can also be formed on a mandrel, and soldered in the same fashion, and the chemist thus enabled to build up small pieces of apparatus from sheet platinum in the laboratory.—Chem. Scientific American Supplement, No. 520, December 19, 1885 The mouth of a is coned to receive the arbors or mandrels for driving the mills or cutters. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z In two instances, the mandrel became stuck in such a manner that the duct line had to be cut into in order to take it out. Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154 By moving the pattern in contact with the table and the mandrel, while the latter revolves, the edges of the work will be shaped and finished at the same time. Scientific American Supplement, No. 312, December 24, 1881 The piece of strip iron is grasped at D. Then with the hammer the iron is gradually worked cold about the mandrel as at E until the perfect form is acquired. The Boy Mechanic: Volume 1 700 Things for Boys to Do Two tubes set end to end are heated to welding, squeezed together by a heavy screw passing through them, and then hammered lightly on the outside without a mandrel. The Atlantic Monthly, Volume 11, No. 63, January, 1863 Rag polishing wheels are formed of disks of rags, either woollen or strong cotton, placed loosely side by side, and clamped together upon the mandrel at the centre only. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z For planishing pipes or tubes a long wrought iron mandrel is provided mounted on two cast iron carriages, each having four flanged wheels for running on rails. Scientific American Supplement, No. 799, April 25, 1891 It consists of a brass frame, F, supporting a small mandrel turning at the top in a conical bearing in the frame, and at the bottom upon a conical screw. Scientific American Supplement, No. 312, December 24, 1881 There are some half circles in this pattern and these are framed by shaping the same about the mandrel with the hammer. The Boy Mechanic: Volume 1 700 Things for Boys to Do He wound the wire prepared by his wife round a mandrel, a very thin steel rod. L'Assommoir In small work that has been drilled or bored, a short mandrel is used instead of the piece b. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z A pallet is fastened on the top of one of the mandrel carriages, Figs. Scientific American Supplement, No. 799, April 25, 1891 The saw is driven by a wooden eccentric placed on the saw mandrel shown in Figs. Scientific American Supplement, No. 312, December 24, 1881 The blank wheel is put on the outer end of the mandrel and a clock wheel having the number of teeth desired placed on the other end. The Boy Mechanic: Volume 1 700 Things for Boys to Do Then he sawed gently, cutting the wire the whole length of the mandrel, each turn forming a link, which he soldered. L'Assommoir At a is a flat place to receive the set-screw of the driver or lathe dog, and at b a flat place upon which the diameter of the mandrel is marked. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The general dimensions are: Distance between pillars, 6 feet; height under girder, 5 feet; height from ground to top of mandrel, 4 feet 1¾ in.; and length of stroke, 5 in. Scientific American Supplement, No. 799, April 25, 1891 A very small grooved pulley is fastened to the mandrel and surrounded by a rubber ring which bears against the face plate of the lathe, as shown in the engraving. Scientific American Supplement, No. 312, December 24, 1881 The frame holding the mandrel, gear blank and clock wheel is inserted in the tool post of the lathe and adjusted for depth of the cutter. The Boy Mechanic: Volume 1 700 Things for Boys to Do There is a steel ring indented into the segments of Prosser's mandrel, to contract the segments when the central wedge is withdrawn. A Catechism of the Steam Engine It is well to taper the end of the mandrel from c to e about 1⁄2000 inch, so that it may enter the work easily before being driven in. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Again, there befell an occasion when the men stole two pounds' weight of five vershok mandrels and bolts. Through Russia The shank of the cutter is fitted to a hole in the mandrel and secured in place by a small set screw. Scientific American Supplement, No. 312, December 24, 1881 The pawl is released and the mandrel turned to the proper number of teeth and the operation repeated. The Boy Mechanic: Volume 1 700 Things for Boys to Do In cases where ferules are not employed, it may be advisable to set out the tube behind the tube plate by means of an expanding mandrel. A Catechism of the Steam Engine Instead, however, of driving mandrels into work, it is better to force them in under a press. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The half-round mandrel being fixed to the lathe face plate will remain true, obviating the liability of the centre of the spherical surface being out of line with the axis of the bearing-bore. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The mandrel is of the same diameter as the cutter, and serves as a guide to the pattern which carries the work to be operated upon. Scientific American Supplement, No. 312, December 24, 1881 A pair of centers are fitted, one of which should have a screw thread and lock nut for adjustment in putting in and removing the mandrel. The Boy Mechanic: Volume 1 700 Things for Boys to Do An expanding mandrel, with a central drift, is more rapid in its operation than when the expansion is produced by means of a screw. A Catechism of the Steam Engine If driving be resorted to a lead hammer, or for very light mandrels a raw-hide mallet, may be used. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The small end of the mandrel is thus the standard of its size, and the wear of the collar gauge is in the same direction as that of the reamer. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Thus, so long as the collar gauge has not worn more than the 1⁄2000 of an inch it will, if placed upon the mandrel, fit it at some part of its length. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z All of these wheels should be fitted to one end of the mandrel. The Boy Mechanic: Volume 1 700 Things for Boys to Do These machines are used for making gauges, reamers, drills, mandrels, taps, and so on. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The centres of mandrels should either have an extra countersink, as at a in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z If the bore of the work is coned, and of too great a cone to permit the mandrel to be driven, and drive the work by friction, the cone mandrel shown in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z It is obvious that for long work there may be gripping pieces at each end of the mandrel, as in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z A small attachment can be made to fasten in the tool post of a lathe and the attachment made to take a mandrel on which to place the blank for cutting a gear. The Boy Mechanic: Volume 1 700 Things for Boys to Do When a mandrel is used upon work having its bore threaded the mandrel also must be threaded, and must abut against a radial face, as at a, in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Another form of mandrel for the same purpose is shown in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z By means of suitable mechanism, this mandrel is rotated to feed the circular circumference of the cross-head jaws to the cut, the slider b remaining in a fixed position upon the bed m. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z This cone mandrel and support is merely an attachment to be put on the machine as occasion may require. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z When the mandrel is put in between the centers a small pawl is fastened with a screw to the frame with its upper end engaging in a tooth of the clock wheel. The Boy Mechanic: Volume 1 700 Things for Boys to Do The pulleys to be turned are placed upon mandrels and driven by two arms engaging opposite arms of the pulley. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z When a mandrel is fitted to the sockets for the lathe centre, it should have a thread and nut, as shown in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z It is obvious, however, that work having a parallel bore may also be held by the cone mandrel, as shown in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z From the end h of the mandrel there extends towards the end g four dovetail grooves, which receive four keys b. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The cylinder was then placed on the mandrel, fastened with a pin, and threaded on both ends. The Boy Mechanic: Volume 1 700 Things for Boys to Do The mandrel thread may be caused to fill the nut thread better if it be provided with three or more splits a, b, c, Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The mandrel must be placed with the centres d receiving the lathe centres. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z For circular rows of holes the centre line of the spindle is adjusted parallel with and at a proper distance from that of the mandrel. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z For holes in the edge of the work, the whole top of slide rest is turned round till the spindle is at right angles with the mandrel. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z When expanding mandrels are caused to expand by a wedge acting upon split sections of the mandrel, they rarely expand evenly and do not maintain a true cylindrical form. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The diameter of the lap is increased by driving the taper mandrel through it, and the lead is therefore maintained cylindrically true. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The lines l l should be marked as fine as possible, but deep enough to remain permanently, so that the truth of the eccentricity of the mandrel may be tested at any time. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z |
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