Part II

arm, so that it always retains an even mesh with the central spindle and the arm is held rigidly by a seg- ment bolted to the frame, thus preventing vibration. Both gear and pinions are very carefully cut and matched together, are very wide -- on the face, insuring durability, and they run without back-lash or rattle. Main gear is 4" face. Spindles Are of steel, and the bearings -- are carefully scraped and fitted. The proportion of length of bear- 4K ing to diameter is to 1. The Adjustment Screw For the table is worked by a crank under the table, making it very convenient, and a foot lever attachment is applied to the table slide so that & the operator has the use of both hands for the woric. The T. L. (self-oiling loose") pulleys are 8"x3K"; speed, 600 R.P.M. Fig. Figure 982 American No. 2 /1 Horizontal Boring Machine HpHIS is a very strong and rigid machine, made entirely of iron and steel and suitable for furniture, -- chair, agricultural and general wood work. Capacity Has a stroke of 12" and will bore holes up to 3" diameter and to the center of 20" vertically. Furnished with each machine, one plain bit socket for 3/2 /' shanks, A no bits. self centering chuck can be had as an extra. Technical Features -- Boring Arbor Is of steel, Its" in diameter and is splined in a steel sleeve which runs in a very long bearing of fine babbitt metal, thus all the journals on the boring arbor are of steel. A Steady Bear- ing--Is placed next to the bit socket so that the wear can be readily taken up and the bit prevented from dodging as it enters the work. -- The Vertical Lever Pulls directly on the center line of the spindle -- and not with a downward thrust. Table Is iron, 18"x32" surface, and has slots for the fence at right angles so that long work can be bored endwise as well as across, at any required angle. The table tilts to 45 degrees both ways, and the adjustable fence can be clamped in any desired position, square, parallel to or at an angle with the -- boring spindle. Numerous holes are provided in the fence for the attachment of jigs or stops. Stop Gauge Is easily reached by the -- operator at his post, and can be adjusted without stopping the machine. The Foot Lever Is arranged to give a good leverage on the boring arbor, and there is a returning spring on each side of the frame to equalize the action. This arrangement gives a quicker and -- easier movement than a counterweight. The tension may be ad- justed when necessary. The Table Bracket Has a vertical ad- justment of 10" and is carefully fitted to the ways with an adjustable & gib; the screw-crank is removable. The T. L. (self-oiling loose) pulleys are 8"x4M"; speed, 1000 R.P.M. Fig. Figure 984 American No. 1 Horizontal Boring Machine HpHIS is a neat and practical design for light work in furniture, chair and general woodworking shops. The frame is cored out hollow and is cast in one piece. --\y Capacity " 2 deep, up to 2" in diameter, and to A the center of 20" vertically. plain bit socket, Yi" hole, is regularly furnished. Technical Features -- Spindle Of steel, It's" diameter, and slides in its own boxes, which -- are longer than the stroke. An adjustable stop-rod determines the depth of hole. Table Is of hard wood glued up, 14"x28". Has an iron stop-bar adjustable to any angle, and held by suitable clamp wheels. Has vertical adjustment by a screw and hand crank, with -- a range of 10". Hand crank is removable when desired. Rear Spindle Bearing Is turned smaller and has bronze end bearing. All bearings are well proportioned and lined with a fine quality of babbitt metal. The foot lever and returning springs are designed -- & for quick and easy operation; there is no downward pull on the rear end of spindle. Countershaft -Has T. L. (self-oiling loose) pulleys, 7"x3X"; speed, 1200 R.P.M. Fig. Style Floor Space Horsepower Boxed for Exp't. Wfit. lbs. Wt., lbs. Cu. ft, Code 984 With Plain Bit Socket 5'2"x2'4" 1 to 4 600 Self-centering Chuck, according to size, extra . 40 Dobby Dobhash 61 62 American No. 7 Pattern-Makers' Lathe IN design and construction this tool has the quality of a modern iron working lathe, and is more convenient and quicker -- to operate than any other tool of its type. Capacity Built in three sizes, 20", 26" and 32" swing. For the 20" machine, beds are regularly furnished 10 feet long while for the 26" and 32" swing, beds are 12 feet. Beds of greater or lesser We lengths can be furnished at extra prices. furnish with each machine: one floor rest stand, one rest extension, two driving centers, two cup centers, two conical centers, three face plates, 8", 12" and 18" diameter, one rosette chuck, two rest sockets for bed, one rest socket for carriage, four rests, 12", 24", 36" and 48" long and one right-angle rest 6" long. Technical Features -- Frame Is heavy, and rigid, the two cored columns have wide flanges preventing any possible vibration. The ways on the bed are wide. The slide for the carriage is placed on the side of the bed -- and below the surface, and will not interfere with any tools resting on the bed. Head Block Is extra heavy, having longer and wider base than on any similar machine. It carries a strong hollow spindle, which runs in our patent side-clamping, self-oiling boxes. The head block may be swiveled 5 degrees either way from the center line. The cone pulley is made of cast iron accurately machined both inside and out- -- %" side. The large end of the cone pulley is closed to prevent dust collecting on the inside. Spindle Has a hole running through it and it is made of the best crucible steel, machine ground and is abso- lutely true. The journals are lined with genuine babbitt metal and are adjustable to wear. An end step or thrust bearing is provided for the spindle so arranged with bronze thrust step, set screw and check nut, as to take up any end play. It is -- interchangeable and can be placed at either end of the head block. Tail Block Is the open type to permit the cutting tools to be brought close to the centers without interference. The K" spindle is bored and reamed for centers, having a taper in 12": the largest diameter is IX", which is the same as the head block, in- suring a large and rigid center. The adjusting screw turns in a bronze -- nut that is securely fastened to the spindle, yet is easily removed when desired. Carriage Can be run either by hand or by power feed and in either direction. It has a 22" bearing on the front side of the bed, is securely gibbed and has a transverse thrust bearing between apron and lower side of bed. The automatic feeding mechan- ism for the carriage is self-contained in the apron, and consists of a train of metal gears driven by worm wheel, which are driven by a longitudinal feed shaft. This in turn is driven from a subcountershaft contained inside the base, which is driven by belt from the head block spindle. All bearings are self-oiling. There are two changes of feed, H" 4s" and per revolution of the spindle. This speed can be doubled -- by reversing the cones on the feed shaft. The cross line screw for moving turret has micrometer dial. Cross-Slide Is neatly fitted and -- strongly gibbed to the carriage and has an extra long traverse for turn- ing duplicate parts. Turret Plate Is graduated in degrees so that -- the compound rest can be instantly set to any desired angle. Counter- shaft Is driven by self-oiling friction clutch pulleys having bronze bushings arranged to run at two different speeds by two belts; namely, 120 and 750 R.P.M., giving the head block spindle a variation in speed from 71 to 2310 R.P.M., in eight speeds. Pulleys 10" and 20"x4X" face. Fig. American No. 13 Pattern Makers Lathe (Hand Feed Carriage) American No. 13 Pattern Makers Lathe (Power Feed Carriage and Motor Drive) (Motor extra) 64 American No. 13 Pattern Makers Lathe /~)UR No. 13 Lathe is a machine designed especially for work in pattern shops and for instruction in schools. It is fitted with swivel headblock, set over swivel tailblock and with carriage and tool post, the carriage to move by hand or power. The regular equipment is the hand feed carriage, power feed being an extra. Capacity-- Made with 16", 20" and 24" swing over bed; 13", 17" and 21" swing over carriage; 59" between centers, with cone head- block and 8' bed; 5' 2" with motor headblock. Beds may be fur- nished 10', 12' or 16' at extra price. When hand break wheel is used in connection with cone headblock the distance between centers is 57". Technical Features -- Headstcck Has a hollow steel spindle running in hard metal boxes with ring oilers. Can be swiveled 5 degrees either way from center line. The spindle has a H" hole through it, and end thrust -- collars with check nuts to take up end motion. Motor headstock is equipt with ball bearings. Tailblock Has set-over and swiveling -- features, and is graduated 20 degrees either way from center line. Carriage May be operated by hand or by power (as an extra) and in either direction. It has a bearing 18" long on front way of bed, and has transverse bearing 6" long back of the apron. The feeding mechanism is self-contained in the apron of the carriage, consisting of cut gears, steel rack and worm wheel. The feed shaft is driven from a sub-counter on the rear of bed. The sub-counter is driven by a belt from cone spindle or motor. There are two changes of feed, V3 and y%" per rotation of spindle. The cross slide is gibbed to the carriage. Cross line screw for moving turret has indexed collar. The turret plate is graduated in degrees and may be removed by -- quarter turn of clamp bolt. The rest sockets are removable without removing hand wheel or clamp screw. Countershaft Has two & pairs T. L. (self-oiling loose) pulleys 8"x3^"; speed 400 and 750 -- R.P.M. giving 8 speeds on head spindle. Equipment One floor stand with offset rest socket, two driving centers, two cup centers and two conical centers, three face plates 6", 10" and 16" in diameter, one rosette chuck, two rest sockets for bed, one rest socket for car- -- riage, three straight rests 12", 24" and 48" long, one angle rest 4" long. Motor Drive Motor drive is an extra and choice is given between a D.C and an A.C headblock; or a D.C or an A.C motor mounted on saddle underneath lathe. Starting apparatus will vary according to conditions and for that reason none is illustrated here. TM L^ Wt. D Bed tance Boxed for Exp' lbs. Betw'n Wt. I Centers lbs. Cu. ft Code 10481 16" 8' Bed, Carriage and Comp. Rest 8'6"x2 2400 10482 20" 8' Bed, Carriage and Comp. Rest 8'6"x2 2500 10483 24" 8' Bed, Carriage and Comp. Rest 8'6"x2 2600 Power Feed Attachment, Extra Each 2' of Bed, extra 5'1' 5'1' 5'1" Dolia Dolichos Dolichorb Dolichurus Doliolum 65 -r-r Figure 1050 American No. 9 Pattern-Makers' Lathe OUR No. 9 Pattern-Makers' Lathe is similar to the No. 8, except that it is not made with a carriage. -- Capacity Standard lengths of bed are 8', but beds 10', 12' 14' and 16' long can be furnished at extra ', price. Width across top flanges, \2j4" \ spread of legs 6 / // 2 . The parts usually furnished are head and tail- stocks, one pair of driving centers, one pair of conical centers, rosette chuck, two face plates, two rest sockets, three "T" rests and floor rest stand countershaft. Technical Features -- Bed Is cast-iron, mounted on iron legs, and planed perfectly true, -- with the headstock and tailstock carefully fitted to it and properly secured by clamping bolts. Head and Tail Spindles Screws and all -- centers are of steel; the tail screw has square threads, and the hand wheel is turned and polished. Main Bearing Caps Are planed into ledges on the headstock and lined with babbitt metal, which is -- carefully scraped, and the journals nicely fitted, so as not to heat when started. Headstock Cone Is of iron, specially strengthened inside but quite light, and it can be reversed when ordered, to bring the large lift next the head center. The countershaft has kiln-dried -- wood cone, glued up in layers, with grain crossed, and fastened at both ends to shaft. Main Arbor Extends at both ends with reversed threads as usual, and there is a detachable yoke to take the end thrust, provided with a bronze step and a hardened steel center pin. A large face plate for overhanging end of arbor and heavy floor rest -- stand, are furnished. Countershaft And hangers with two pairs & of T. L. (self-oiling loose) pulleys, gives eight speeds on spindle; & T. L. pullevs for 20". 9"x4K"; for 24", 10"x4^"; speed, 400 to 750 R.P.M. �f DP | It .-J*. Figure 1052 American No. 10 Pattern-Makers' Lathes ("^)N these lathes the head and tailstocks are cored hollow and made heavy and rigid so as to resist vibration or "chatter." The head and tail spindles and all centers are of steel; the tail screw has square threads, and the hand wheel is turned and polished. -- Capacity Made in three sizes, to swing 16", 20" and 24". The parts furnished include head and tailstocks, one pair of driving centers, one pair of conical centers, rosette chuck, two face plates, two rest sockets, three rests, floor rest stand and clamp bolts with hand wheels for bed 10" to 12" deep and countershaft. Technical Features -- Main Bearing Caps Are planed into ledges on the headstock and lined with fine babbitt, which is carefully scraped and the journals nicely ground and fitted, so as not to heat when started. All surfaces -- resting on the bed are planed true and do not require fitting down if the bed is true. Headstock Cone Is of iron, specially strengthened inside but quite light, and it can be reversed, when ordered, to bring the large lift next the head center. The countershaft has kiln-dried -- wood cone, glued up in layers with grain crossed, and it is fastened at both ends to the shaft. Main Arbor Extends at both ends with reversed threads, as usual, and there is a detachable yoke to take the end-thrust, provided with a bronze step and a hardened steel -- & A center pin. large face plate for the overhanging end of the arbor, and a heavy floor rest stand, are furnished. Countershaft Has T. L. (self-oiling loose) pulleys as per schedule below. Wood beds to order. Fig. Figure 1064 American 12-inch Speed Lathe Plain with Countershaft Figure 1064-E American 12-inch Speed Lathe With Carriage and Tool Post and Swiveling Headblock and Tailstock 68 American 12-Inch Speed Lathe THE American 12-inch Speed Lathe is a strictly high grade tool, designed for manual training work and will be found adequate to every H purpose of the class room. It will also meet the requirements of any pattern shop for a lathe with a 12" r swing. It is built with or without a movable carriage and set-over tail stock. -- Capacity It is made regularly with a 55" bed which gives a maximum distance of 26" between centers. It is also made with 48" and 72" beds, American Tool Holder giving a distance between centers, 19" and 43" respectively. It is fur- nished with headstock and tailstock with swiveling features as an extra. With each machine is furnished a }4" cup center, one 6" face plate, one 3" rosette chuck for interchangeable screws, one 6" rest, one 12" rest, one blue print holder and one center drift for headblock. Technical Features -- Bed Is made of cast iron, carefully planed and finished. There -- are no flanges on the inside to collect dust and chips. Headblock Is nicely fitted on planed ways and secured by clamping bolts. The bearings on the belt driven lathes are ring oiling bronze bush and adjustable for wear. There are ball bearings on the motor headblock lathe. Cone Pulley is made of cast iron and is finished -- inside and out. The spindle is hollow and is made of high carbon steel. An end step thrust collar takes up all play. Tailblock Is constructed so the cutting tools may be brought close to the centers -- without interference. Spindle is bored and reamed for centers, hav- ing a taper ]/2 " in twelve. Countershaft Has self-oiling bearings, four step cone and tight and loose pulleys 6"x2K". 800 R.P.M. -- -- Motor Drive Extra according to type. D. C. Motor Headblock The A. W. C. Motor is a special design for use with our equipment only. Its operation is very simple, consisting of a start and stop push button station, the starting point working in connection with a magnet switch which closes the main circuit to motor. The rheostat handle must always be brought back to the minimum speed point in order to insure the motor starting on full field. The speed can then be regulated between 600 and 3000 R.P.M. by movement of the rheostat handle operating through field circuit of motor, and this provides maximum efficiency at all speeds. It is also provided with overload circuit breaker, low voltage release and dynamic braking which brings the motor down to predetermined speed. The stop button working in connection with the -- low voltage release, with the dynamic feature, brings the motor to a stop. A. C. Motor Headblock An A. C. Headblock on a Speed Lathe is an entirely new idea; and, the fact that it is new and because we originated it, we are not a little proud of it. Heretofore an A. C. Drive has been obtained by mounting the motor on a saddle underneath lathe and belting from the cone on motor to the one on the headstock. The convenience and safety of our new Motor Head- K -- block idea over the old method will be readily apparent since the use of belts is eliminated. Motor is H. P. 3 phase, 60 cycle and gives four speeds 570, 1,140, 1,710, 3,420. (A 2-phase installation can be had at a slight additional cost.) The controller, like the motor, is made especially for use after our own specifications. It is mounted in the leg of the lathe and is operated by the lever -- shown in cut. It is totally enclosed and in the "off" position the motor is entirely disconnected from the line. Motor Underneath Head Block This K motor is H. P. and is mounted on a saddle underneath the headblock and enclosed. To the motor shaft is attached a four-step cone pulley which is belted to the cone pulley in the headstock through an opening in the bed of the lathe. This motor may be a D. C, a single-phase A. C. motor, or again a two or threephase A. C. motor. The illustration shows a polyphase motor, any voltage, running 1800 R.P.M. The Starting Apparatus, as shown below is an American Iron-Clad Fused Switch which is totally enclosed. 69 Figure 1064-B American 12-inch Speed Lathe With Motor Headblock and A. W. C. Special Control Figure 1064-C American 12-inch Speed Lathe With Motor Headblock and A. W. M. Special Control 70 Figure 1064-A American Friction Clutch Figure 1064-D American 12" Speed Lathe A. C. Motor Mounted on Saddle and A. W. M. C. Enclosed Switch 71 Details of American 12-Inch Speed Lathe GENERAL Sizes of lathes 12"x48"; Distance from floor to top of 12"x55"; 12"x72". Distance between centers, 19", 26", 43" bed, 36". Depth of bed, 5yi". W 6y 7idth of bed, 2 ". Width of belt on Tight and Distance from floor to center Loose pulleys 2". of spindle 42". Diameter of driving shaft, 1%". HEADSTOCK Length of headstock, 12 ^i'' Width of headstock, 6". Size of bearings, 1 J4," x 3" and l^"x3". Length of spindle over all, 14%". Diameter of spindle, 1 Jiij". y Diameter of hole in spindle , 2 ". Diameters of cone on spindle, 6%", 5", 3#", iy2 ". Rates of speed, 480; 800; 1333; Width of belt used, 114". 2400. TAILSTOCK Length of tailstock, 9". Length of spindle, 8>�". Width of tailstock, 6". Diameter of spindle, }i". Set-over of tailstock, 2" back of Size of bearings, l^i"x8". center and 1" forward of center. Adjustment of spindle, 5". CARRIAGE AND TOOL POST On the 48", 55" and 72" Lathes respectively. Travel on bed, 17^";24^";41>^". Cross feed, 5". Length of bearing on bed, 12". Size of slot in post, ||"xl^". COUNTERSHAFT Length of Shaft, 30". Diameter of Shaft, l%". Diameter of cone, 3^"; 5"; 6%"; iy2 ". Drop of hangers, 9 . Face of cone, }4". Size of bearings, I%"x6^". Speed of Shaft, 800. Size of tight and loose pulleys, 6"x2-Hs". Fig. Style Horse- Wgt. power lbs. Boxed for Export Wt. lbs. Code -- 12" Speed Lathe, 55" bed without carriage and tool post with coun..... tershaft .... 48" Iron Bed .... 72" Iron Bed .... 90" Iron Bed -- Rear End Face Plate and Floor Stand without rest, extra Universal Hand Turning Tool Holder, extra Carriage and Compound Rest and Tool Post, extra Set- over Tailblock, extra Cone mounted on American Friction Clutch for shaft above lathe, extra Cone mounted on American Friction -- Clutch for shaft underneath Lathe (no shaft) extra .... D. C. Motor Headblock and Special A. W. C. Control (Conduit Wir1 ing ), extra D. C. Motor Headblock and Ordinary Field Control, extra . A. C. Motor Headstock with Controller and Dynamic Brake, extra A. C. Motor on Saddle underneath and Iron Clad Fused Switch, extra A. C. Motor on Saddle underneath and American Enclosed Switch, extra 800 30 Domal Domboc Dome Domert Domesday Domestic Domett Domicella Dominant 11 Auxiliaries used on Lathe in Turning 1, 12" rest. 2, 6" rest. 3 Angle rest. 4, Cup center. 5 and 6, Conical centers. 7, Spur center. 8, Rosette chuck face plate. 9, Rosette chuck with face plate and taper center. 10, Crotch center. 11, Drill pad. 12, Rest socket plate. 13, 6" face plate. 14, Rest socket. 15, Print holder. 16, Small Hollow chuck. 17, Large Hollow chuck. 18, l"x7" Emery Wheel Attachment, no emery wheel furnished. 19, K"x7" Emery Wheel Attachment, no emery wheel furnished. 20, Speed Lathe Collet. S A \ , \ \ 11 12 ! American Turning Tools The above cut shows a few styles of American Gouges or Turning Tools. 1, Roughing and Smoothing Chisel. 2, Double Edge Skew Chisel. 3, Skew Edge Chisel. 4, Spear Point Chisel. 5, Straight Chisel. 6, Gouge. 7, Round Nose Chisel. 8, 9, 10, 11, 12, Tool Post Turning Tools for Carriage. 73 Figure 10700 American No. 2 "Columbia" Three-Drum Sander 74 American No. 2 "Columbia" Sander OUR Columbia Sander was the first machine made with a successful automatic take-up drum. The machine in recent years has undergone many minor improvements, and the product we turn out today we designate our Columbia No. 2. Quite recently we have added a new method of driving the drums; that known as our Silent Chain drive which is furnished at the -- option of the purchaser. See page 76. Capacity Made regularly to open 8", but can be made to open 12" thick at an extra price. There are three rates of feed, and the machine is furnished with drums covered with sandpaper ready for use. Technical Features -- The Top Frame Is supported on all four corners on posts, and rises and falls on raising screws, which have bearings on top and bot- tom. All back-lash of the screws is avoided, whereby one of the -- most common causes of poor work viz., the rocking of the top -- frame is overcome. All operators who have had to contend with -- back-lash in the raising screws will appreciate our device for over- coming this fault. The Cylinders The most important feature of a sander, are three in number, each made in one piece, of semi-steel casting, turned, ground and balanced on especially constructed ma- chines. They are provided with our patent automatic paper tight- ener, which takes up all slack in the paper while the machine is doing its work. Tight-fitting paper is the first requisite for good work. On no other make of sander is found this automatic feature, as it is covered by our own patents, and we guarantee that in all instances it will perform just what we claim for it; namely, that the paper on the drums will be kept at an even tension at all times and at all points. The adjustment of the cylinders is regulated by hand wheels, placed together on the working side of the machine in convenient reach of the operator. The raising and lowering is accomplished by wedges, which give the cylindershaft boxes a firm support, avoiding all jump- ing as is necessarily the case when raising and lowering is accomplished by screws. For re-covering the cylinders with felt or cloth, it is not necessary to take them out of the machine, as is the case with other makes of sanders, since this operation can be performed with little -- trouble while the cylinders remain in their respective places in the machine. Feed There are three speeds of feed practically in- stantaneous. The lever and segment for operating the feed are -- located on the left hand side of the lower front girt. The segment contains five holes three for the different speeds of feed, and two intermediate holes for instantaneously stopping the feed. The de- -- vice is accessible through an opening in the front girt of machine. Power Hoist Is provided for the top feed works, which is not only --We a saving in time but also in labor. Its action is prompt and per- fectly reliable. In The Oscillators have obtained mechanical perfection, and by our device the reciprocal movement is absolutely in the line of the axis of the cylinder, thereby avoiding any lifting or --cramping motion. This is imperative to secure good work. The Boxes For cylinder shafts, oscillators and counter-shafts are self-oiling, having oil receptacles and drain plugs; the loose pulley is also similarly arranged. Fig. American No. 2 Columbia Three Drum Sander (Silent Chain Drive-- Belt) American No. 2 Columbia Three Drum Sander -- (Silent Chain Drive Motor) 76 Clamps Closed Clamps Open Automatic Sand-Paper Take-up THE illustration above shows two transverse sections of the Columbia Sand-paper drum and reveals the operation of our Automatic Take-up, which, we claim, is the simplest and most efficient device of its kind made. The drums are cast in one piece (not made by short sections set- screwed to the shaft), which greatly enhances the rigidity of the shaft removing from it all trembling. The Take-up frame or paper stretcher is also cast in one piece, and swings loosely on the drum shaft. Before it is inserted into the cylinder it is carefully balanced. The clamps consist of an oval steel bar fitting closely in an oval seat. One clamp is fastened to the cylinder casting, the other to the Take-up frame. They are actuated by eccentric clamp shafts. Turning these in one direction closes them, and turning them in the opposite direction opens them. The clamp shafts press on a series of flat springs in order to accommodate different thickness of paper at the same time, furnishing an excess of pressure. The paper being held in oval seats with the aforesaid excess of pressure can never pull out. The Take-up is held back by a series of eccentrics while the paper is being put on the drum. As soon as these are released the coil springs come into action pushing it towards the other side of the open slot. As it is mounted on the central shaft and moves on the line of the circumference, any slack of paper that may occur will instantaneously be taken up as it appears. To put the paper on the Columbia drum is the simplest kind of a job and requires but a moment. Place one end of the paper into the set of clamps on the strike side of the drum and close the clamps; then revolve the drum until the other set of clamps appear; insert the other end of the paper into the remaining set of clamps and close them. This done, release the eccentric, and the work is finished. If it should become necessary to re-cover the drums with felt or canvas the operation is easy and consumes but little time. There is a half-round strip of steel under which is fastened the felt on the strike side of the drum. The other end is simply tucked in and held by the take-up. When it is remembered that there are sanders on which the drums have to be taken from the machine before they can be re-covered, this is no small item in favor of the Columbia. 77 Wedge Block Adjustment of Drums THIS illustration is a broken out view of the wedge block adjustment as applied to the Columbia Sander. By the use of the wedge block we have an absolutely rigid support that will not wear, as is the case where the drums rest on screws. Hence, no lost motion can occur to disturb the parallelism of the drums. A, represents the drum box stem which fits closely into a reamed hole in the frame. Across this stem is planed deeply a diagonal slot which the wedge block, B, engages. -- This wedge block slides in a sub- stantial housing in the frame represented by C. The wedge blocks on both sides are connected and adjusted by hand wheels at the front of machine. A careful study of the illustration will clearly show the rigidity that must obtain with this construction, and the superiority over raising screws must be readily apparent. If it should become necessary to adjust these wedges for an align- -- ment of the drums (which is most unlikely) provision is made for that, and it is simple requiring nothing but the turning of a screw in the block itself. A Perfectly Central and Non- Cramping Oscillator THE oscillator is the most deli- m cate piece of mechanism in the construction of a sander and the most difficult in which to overcome wear and lost motion. As implied in the title, its action must be perfectly central and there must be no cramping. In other words, there must be no pulling up and down. The flexible joints together with the eccentric and strap illustrated here insure an absolutely central oscillation. Means for the perfect circulation of oil is an essential feature of the Columbia oscillator, as well as of the drum shaft bearings, and is clearly shown in the illustration. Provision is made for taking up lost motion in the oscillator bearings as shown by the reversed collar on the end of the drum shaft which is filled with fibre washers. Babbitted washers are located between the collars and the oscillator boxes to prevent any wear there. 78 ^T -0- Figure 11140 American No. 7 Disk and Spindle Sander Vy/'E have incorporated in this design all the requirements for a combination sanding machine for Pattern, Furniture, Chair, and general woodwork for either flat or curved surfaces. Ball bearings are provided on the operating spindles; all moving parts are driven from the main arbor and provision is made on the base for the attachment of a motor with auto- matic belt tightener for driving the arbor; or it may be driven from the countershaft which is furnished unless otherwise specified. The machine is made in three forms, viz. : as shown in the engraving with disk and vertical roll spindle; with disk and drum; or with two disks; either form admits of the unit motor drive when ordered as an extra. -- Technical Features -- Main Frame Is massive, has a broad base and is a single casting in -- cored form measuring 26" x 31" on the floor. The Disks Are of semi- steel K" thick, machined to hold the cement and put in exact running balance. Dust hood under the table is arranged to connect with an -- exhaust pipe. Disks are quickly removable from the main arbor for changing the sand paper. Disk Table Moves vertically on machined and hand fitted ways and is counterbalanced by protected weights; a foot lever linked to the slide and operated from the right hand side of the machine overcomes the friction on the ways and makes the adjustment easy; a clamp screw on the slide gib is located over the lever. The table is also adjustable to and from the disk and can be tilted from 10� up to 45� down by means of a toothed and graduated quadrant operated by a worm and hand wheel. The quadrant can be clamped rigidly at any angle and the table rests on machined rockersthe center line of which lies on the face of the disk. Roll Spindle Has ball-bearings in a vertically moving yoke which gives an end motion to the sand roll while in operation. The spindle is 74," diameter where the rolls are attached and the latter are clamped on by cupped collars and held perfectly central. The rolls are made of kiln dried hardwood covered with elastic material and cut in two centrally for -- easy attachment of the sand paper and a quick change of sizes. Roll Table Is 27" x 27" and can be tilted forward 45� and backward 5�. It is adjusted to any position by a toothed quadrant and worm and hand wheel and after adjustment can be clamped rigidly. Center plates are fitted into the table around the rolls permitting quick chang- -- ing and also the tilting of the table but with a close clearance around the rolls. Drives May be by a belt to the main arbor through the countershaft: roll spindle can be disconnected from the main drive by a clutch which releases all the operating parts connected with the roll spindle Motor drive attachment is provided for on the machine frame with an automatic belt tightener, making a unit construction with starting box attached, needing only connection with the power circuit. In ordering a motor drive (extra) state the kind of current -- required; we recommend and usually carry in stock A. C. 3 phase 220- volt motors. Countershaft Has 10 x 5}^ T. & L. pulleys and --should run 625 R. P. M. giving main arbor 750 R. P. M. Equipment Consists of three spindle rolls with table plates to correspond, one extra 30" disk, six No. 1^ sand paper circles, one centering slide and -- one graduated gauge for the disk table, together with necessary wrench- es and one can of cement Floor Space 48" x 65" (with motor attached) Fig Figure 1111 American No. 6 Disk and Drum Sander 'T^HIS machine is intended for use in furniture, chair and cabinet shops and is peculiarly adapted to manual training shool work. It is made with a disk and drum, or with two disks and in range of sizes, per table below. Technical Features -- Disk The disk is made of iron, accurately turned and balanced. The clamping ring is made in four sections for convenience in renewing paper. The regular sizes of discs are 30", 36", 42" and 48" in diameter, Drum-- and the working surface in each case is 2" less. The arbor is cf steel accurately ground and runs in babbitted self-oiling boxes Is built up of kiln-dried wood on iron centers and is made in two sizes -- 13" x 16" and 16" x 24". It is covered with carpet or felt which makes a proper mounting for the sandpaper. Tables The disk table is adjustable vertically by hand wheel as shown in cut and tilts to an angle. The drum table may be removed if desired. They are made of glued up strips of hardwood, or of iron, if ordered. Counter- -- & shaft T. L. (self-oiling loose) pulleys are 12" x 43^", and should -- make 450 to 700 R.P.M. Motor Drive When motor drive is furnished the base is extended to receive the motor as shown in the illustration. Fig. ^ .. American No. 14 Grinding Machine /^)UR No. 14 Grinder is designed especially for manual training schools, pattern and general woodworking shops. It is provided with two 12 //x2 // alundum wheels, and one 5"x3>�" alundum cone for wet grinding. It has an attachment for grinding flat hand-plane bits. Oil stones can be used in place of the alundum wheels, but the latter are preferable because they will not gum up easily and do not have to be frequently dressed off on that account. Two alundum wheels 12"x2" and one alundum cone 5"x3J^" are furnished when required. Hole in wheels %" diameter. Technical Features -- Frame Is a one-piece casting with broad foot flange and stands -- free from vibration when the wheels are kept in balance. Arbor Is fitted with a two-step cone pulley, giving two speeds for different size of wheels. The driving cone and belt are enclosed in the machine The arbor bearings are of good length and are self-oiling. Water tanks -- are located under each wheel and are adjustable vertically by foot treaders at the base of machine. Motor Drive When motor drive is required (as shown in the cut) the base of the machine is extended to -- receive the motor