ARTER Model A Rotary Surface Grinders are built in a light and heavy series. General Construction- The general design of both models is the same but the major units of the A-3 machines are of greater proportions. The wheel head moves on a flat and vee track, hand and automatic feeds being provided, the final drive being a rack and pinion. The wheel spindle runs in straight holed, split, bronze bearings, positioned in tapered sleeves. The spindle is driven by a 4" belt running over a laminated driven pulley, a ball bearing mounted idler providing belt tension. The knee moves on dovetailed ways, a double taper gib running its full length insuring rigidity in all positions. It is raised or lowered by means of an elevating screw and handwheel, the latter carrying a disc graduated in thousandths (or millimeters). The wheel mount is positioned over a key on the tapered end of the spindle. Adjustable balancing weights are provided. Standard equipment includes one x 1" x 8" hole wheel: Wider wheels can be used. The wheel is dressed by placing the diamond and holder on the chuck and moving the wheel across it. Extras- Automatic work table elevating attachment operated by the wheel slide and giving feeds at either or both ends of the work ranging from.25" to.3". A direct current generator on the machine driven from the main drive shaft pulley can be supplied for energizing the chuck. Auxiliary top plates of various diameters for the magnetic chuck. Model A-1- This model has three chuck speeds and three wheel slide traverse speeds for each chuck speed. The spindle is mounted in a housing which is hung on a substantial taper pin positioned in the knee. This permits the tilting of the work table for grinding concave or convex work. The spindle has a hardened and ground steel conical collar shrunk onto its upper end. The angular face of this collar runs in a bronze bearing forming a self-centering, self-adjusting, smooth running bearing. The collar dips in an oil reservoir just below it and by means of spiral grooves carries oil up the face of the bearing. The oil flows back to the reservoir through passages cut in the bearing. A sight oil cup permits maintenance of the oil level. The lower end of this spindle runs in a straight-holed, split, adjustable bronze bearing similarly lubricated. Control of the spindle is through an expanding friction clutch. A brake is provided, operated by a clutch lever, for quick stopping of the spindle. The chuck is attached to the threaded end of the spindle nose by means of an adaptor plate. Model A-3- This model has four chuck speeds and thre_e wheel slide traverse speeds for each chuck speed. The chuck spindle is mounted, top and bottom, in precision matched sets of preloaded, doublerow ball bearings, grease lubricated. The spindle housing is hung on a substantial taper pin positioned in the knee. This construction permits tilting of the work table for grinding concave or convex work. Adjustment is made by means of a screw, and a graduated plate indicates the degree of tilt. The chuck is bolted to the flanged end of the spindle.
MODEL A-I-SPECIFICATIONS Surface Diameter of M agn etic Chuck..................... Greatest Swing Inside W ater P a n....................... V ertica l C a pacity-full Diam eter Wheel........ Tilt of Work Table for Convex Grinding. Tilt of Work Table for Concave G rinding....................... Dia meter of Grinding Wheel- 1" wide, 8" hole........... Chuck Spindle Speeds.... M ain Shaft R.P.M................. Wheel Spindle R.P.M................. M a in D rive Motor 18-15 R.P.M........................ N et W eight................. Crated Weight................. Boxed W eight (Cubic feet 8" -18, 12 " - 123 ). F loor Space O ccupied........................................ 8" 12" 8.Y2" 13 " 16 " 11 " 9".................................... 1 1 86-156- 283 5 15 5 HP 3 1 36 37 7 " X 7" 9" 12 so 53-96- 174 5 15 5 HP 335 38 45 72 " X 7"
MODEL A-3-SPECIFICA TIONS 12 " Surface Diameter of Magnetic Chuck. Greatest Swing Inside Water P an....... Vertical Capacity- Full Di ameter Wheel... Tilt of Work Table for Convex G rinding. Tilt of Work T able for Concave Grinding. Diameter of Grinding Wheel 1" wide, 8" hole..... Chuck Spindle Speeds. Main Shaft R.P.M...... Wheel Spindle R.P.M.. Main Drive Motor 18-15 R.P om o. Net Weight........ Crated W eight.. Boxed Weight (Cubic feet 12 " - 16, 16" - 19). Floor Spa ce Occupied............. 16" 13 " 2 " 17 " 2" 9,Y " 9,Y " 1 1 3-5- 9-15 5 15 7,Y HP 45 48 51 8" X 7 " 1 1 3-5- 9-15 5 15 7,Y HP 5 53 56 82 " X 7 11
The countershaft assembly is driven by chain from the grinder main shaft. The countershaft belt is shifted on the three-step cone pulleys by the lever over the unit. From the countershaft, a universal shaft with automobile type joints drives the chuck spindle through a bronze spiral gear and a cast iron spiral gear mounted on the chuck spindle. Motor Drive- On both models the drive is by means of multiple vee belts. The motor is positioned on the rails pivotably mounted on an extension of the machine base. Screws are provided for the belt tension. St G v T T D c!v "'!V N c B F This v1ew shows the machine with all belt guards removed. The speed change mechan ism for the chuck and wheel slide is enclosed in an oil tight case. All shaft bearings are force-feed lubricated from a plunger pump positioned within the case. Duplex roller chains are used and tension idlers are provided. Clutches are of the multiple disc type. Levers for making speed changes are mounted at the front of the machine. The drive between countershaft and chuck spindle is by twin vee belts to a worm shaft carrying a hardened and ground worm, mating with a bronze worm wheel on the chuck spindle. A multiple disc clutch is mounted on the worm shaft and is so constructed as to act as a brake when declutched. From the countershaft, and by means of three-step pulleys a reversing gear mechanism and a rack and pinion, drive is provided for wheel slide reciprocation. The main shaft, both belt idlers, and the chuck drive shaft, are ball bearing mounted. Chain driven shafts run in needle bearings. The chuck collector rings are small in diameter and are attached to the bottom of the chuck spindle. The brushes are readily accessible. Chuck coil replacements can be made by removing the chuck top plate only. With this model we supply a long tank having several baffle plates, these trapping the chips and dirt in the coolant, so that clean liquid flows to the grinding wheel.
The illustrations on t his page are typical Arter Rotary Surface Grinder jobs. is tilted to the angle required. To grind gear s haper cutters the chuck Ball bearing spacers are ground in pairs to parallelism of.5 11 on a Model A-3. Grinding gears, spacers, washers, chasers, and rolls, in multiple are common jobs. parts present no difficultie s. Circular surfaces on irregular On master connecting rods and other parts a flat surface, a fillet and a hub diameter are ground in one chucking. Saws of all kinds, thrust collars, s leeves and the like are ground with the faint grinding lines in the des irable concentric p a ttern. Fixtures, held magnetically, are frequently u sed. The chucks have a hardened and ground centering bushing for the fi x ture pilot. Pump and Tank- The coolant tank 1s positioned on the floor behind the grinder. The motor driven pump is of the submerged centrifugal type with all bearings above the liquid. The coolant nozzle is adjustable for work positions. General- All revolving parts of the machines and belts are guarded with exception of the low powered slide reversing gear box belt. Oil cups in plain sight are provided for supplying oil to those parts not continuously lubricated, Printed in United States of America 6-45