Modified Stock Gearing - Boston Gear

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$sub-fractional hp double reduction flanged reducers - Boston Gear$

BOStonE Molded Nylon Bearings Thrust Type ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE A B C 3/16 3/4 1/16 .189 .750 .070 1/4 5/8 3/32 .255 .620 .097 1/2 13/16 3/32 .503 .820 .095 9/16 13/16 3/32 .565 .812 .095 5/8 1 3/32 .630 1.000 .094 3/4 1-1/16 3/32 .760 1.063 .094 7/8 1-1/8 3/32 .890 1.125 .094 1-1/4 2-1/8 3/32 1.290 2.140 .098 1-1/2 2-1/16 1/8 1.555 2.058 .120 Tolerances apply to actual (decimal) dimensions. Catalog Number Item Code NT312 56911 NT410 56912 NT813 56913 NT913 56914 NT1016 56915 NT1217 56916 NT1418 56917 NT2034 56918 NT2533 56919 B A STANDARD TOLERANCES Dimensions Tolerance A B All ± .015 C C F ALL DIMENSIONS IN INCHES ORDER BY CATALOG NUMBER OR ITEM CODE A C G F H J Cable Catalog Item Size Number Code 1-1/4 1/4 .400 1/2 31/32 1/4 P1250-2 57522 2-5/8 3/8 .500 017 3/4 2-1/8 1/4 P2625-3 57525 2-5/8 1/2 .500 — 3/4 2-1/8 1/4 P2625-4 57526 Cable Pulleys STANDARD TOLERANCES Dimensions Tolerance C All + .005 to + .010 A C F TYP. H TYP. J G P-1930-BG 04/10 Boston Gear 800-825-6544 173
Engineering Information Sleeve Bearing Selection F The performance of a bearing is influenced by the conditions of speed, mating materials, clearances, temperature, lubrication, type of loading, etc. Of primary importance, is the maintenance of an oil film between the bearing surfaces to reduce friction, dissipate heat and retard wear by minimizing metal to metal contact. The most critical periods of operation are during starting and stopping, when the load may cause the bearing surfaces to come into contact with each other. For these reasons it is not practical to predict the wear rate of bronze bearings. The selection of the best bearing for an application can be a very complicated problem because the combined influence of the many factors affecting the operation is difficult to predict. The following information may be used as a guide for selecting a Bronze sleeve bearing which should satisfy the requirements. For practical reasons, the length of the bearing should normally be between one and two times the shaft diameter and the O.D. approximately 25% larger than the shaft diameter. Starting and Stopping/ Oscillatory Motion/Cyclical Overload conditions mean a full film of oil cannot be maintained. When this happens, metal-tometal contact occurs and causes bearing wear. Because of the continual interruption of the oil film, a larger safety factor is required when designing bearings for applications of this type. A lower permissible PV factor must be considered. Speed/Oil Viscosity must also be considered. The proper viscosity oil must be selected for each particular speed application, to achieve optimum bearing operation. For high speed applications, a light oil (150 SUS at 100°F) is required to keep internal oil friction at a minimum and assure proper metering of the oil to the bearing/shaft surface. For moderate speeds, a medium-viscosity oil (400 SUS at 100°F) is required. For very low shaft speeds under moderate or heavy loads, a heavier oil with an extreme pressure additive may be required to prevent complete oil film rupture and give sufficient lubrication for proper operation. Shaft Consideration is extremely important in bearing applications. For optimum operation the shaft must be of proper material, hardness, surface finish, roundness and dimensions. Experience indicates that carbon steels, and preferably C1137, offer the best operating results. If stainless steel shafts are to be used, 400 Series is recommended. Austenitic 300 Series stainless steel tends to gall, which results in extreme wear and shortened life. If 300 Series stainless is required for its non-magnetic qualities, it is strongly recommended that shafts be work-hardened or chrome-plated for satisfactory operation. For best results, a shaft surface finish of 4 to 12 RMS is recommended. Nicks, gouges, and burrs should be avoided because they rupture the oil film and cause metal-to-metal contact. Shaft roundness and dimensions also contribute greatly to bearing life. The more round the shaft, the less the bearing and shaft wear, with longer life resulting. Dimensions also play an important role in operation and should always be in accord with the recommended bearing clearance charts. As stated, for practical reasons the bearing length should normally be between one and two times the shaft diameter. However, the recommended practice is by using the PV factor. PV is a means of measuring the performance capabilities of bearings. P is expressed as pressure or pounds per square inch on the projected area of the bearing. V is velocity in feet per minute of the wear surface (surface feet per minute). “PV” is expressed by the following: PV = W__ x ____ πdn = ____ πWn = .262Wn ______ Ld 12 12L L P = W _________________ A (Brg. I.D. x Length) V = Surface velocity of the shaft, ft./min. (.262 x RPM x Shaft Dia.) W = Bearing load in pounds L = Bearing length in inches d = I.D. of bearing in inches (cancels out of formula) n = Shaft speed, RPM 174 Boston Gear 800-825-6544 P-1930-BG 04/10
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A L T R A I N D U S T R I A L M O T
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Table Of Contents Stock Altered and
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Modified Stock Gearing With thousan
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Custom Gearing “Request For Quota
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Custom Gearing Capabilities Gear Ty
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Gear Selection Stock Gears Pressure
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Product Selection / Reference Guide
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Boston Gear Helical Gears ■ Paral
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Boston Gear Worms and Worm Gears
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Spur Gears 48 and 32 Diametral Pitc
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A Spur Gears 24 and 20 Diametral Pi
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Spur Gears 10 and 8 Diametral Pitch
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Change Gears 20 Diametral Pitch (St
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Change Gears 12 Diametral Pitch (St
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Change Gears 8 Diametral Pitch (Ste
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Drawn Pinion Wire 48, 32 and 24 Dia
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Internal Gears 48 through 16 Diamet
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Spur Gears 48 Diametral Pitch (Delr
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Spur Gears 32 Diametral Pitch (Delr
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Internal Gears 64 through 24 Diamet
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Spur Gears Approximate Horsepower a
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Helical Gears 24 through 10 Transve
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Helical Gears Boston standard stock
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Helical Gears Approximate Horsepowe
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Miter Gears 48 through 20 Diametral
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Miter Gears 8 through 4 Diametral P
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Bevel Gears 48 through 20 Diametral
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Bevel Gears 12 and 10 Diametral Pit
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Spiral Bevel Gears 30 through 8 Dia
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Miter Gears Steel & Iron - Straight
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Bevel Gears Steel & Iron - Straight
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Notes C 84 Boston Gear 800-825-6544
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Worms & Worm Gears 48 Diametral Pit
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Worms & Worm Gears 8 Diametral Pitc
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Worms & Worm Gears 4 Diametral Pitc
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Worms & Worm Gears Boston worms and
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Worms & Worm Gears Steel-Hardened,
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Shaft Couplings FC Series Insert (3
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Shaft Couplings BF Series Bost-Flex
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Shaft Couplings SCC Series Clamping
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Shaft Couplings FCP Series Sleeve T
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Universal Joints J/JS Series Bored
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Universal Joints UJNS/UJNL Series B
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Universal Joints JP Series Single a
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Setscrew Collars SC/SSC Series Stee
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Clamping Collars CSC/CSSC/CASC Seri
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Thrust Washers Steel and Stainless
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Grooved Pulleys G1200 Round Belt Ty
Page 127 and 128: Miniature Timing Belts and Pulleys
Page 129 and 130: Miniature HTD ® Timing Belts 3M Se
Page 131 and 132: Timing Belt Pulleys PA Series For 9
Page 133 and 134: Timing Belt Pulleys PLB Series For
Page 135 and 136: Miniature HTD ® Timing Belts 5M Se
Page 137 and 138: Timing Belt Pulleys PA Series For 1
Page 139 and 140: Timing Belt Pulleys PLB Series For
Page 141 and 142: BOST-BRONZ Oil-Impregnated Sintered
Page 151 and 152: BEAR-N-BRONZE 660 Cast Bronze Beari
Page 159 and 160: Bronze Bearing Emergency Banks SAVE
Page 161 and 162: BOStonE F-1 Glass Filled Teflon Bea
Page 163 and 164: RULON ® 641 Bearings Boston Gear
Page 165 and 166: BOStonE Molded Plastic Bearings F B
Page 167 and 168: BOStonE Molded Plastic Bearings Rol
Page 169 and 170: F BOStonE Molded Plastic Bearings R
Page 175 and 176: BOStonE Molded Plastic Bearings Gui
Page 177: BOStonE Molded Nylon Bearings Plain
Page 181 and 182: Engineering Information Sleeve Bear
Page 183 and 184: Engineering Information Lubrication
Page 185 and 186: Engineering Information Shaft Clear
Page 187 and 188: Engineering Information Machining F
Page 189 and 190: Anti-Friction Bearings Ball Bearing
Page 191 and 192: F Anti-Friction Bearings 1600 Serie
Page 193 and 194: Anti-Friction Bearings 7600 Series
Page 197 and 198: Anti-Friction Bearings Flanged 400F
Page 199 and 200: Anti-Friction Bearings 600 Series T
Page 203 and 204: Self-Aligning Bearings KF Female Se
Page 205 and 206: Self-Aligning Bearings CMHD Male/CF
Page 207 and 208: Self-Aligning Bearings HME Male/HFE
Page 209 and 210: Self-Aligning Bearings LHA-LHB-LHSS
Page 211 and 212: Self-Aligning Bearings LS/LSS Serie
Page 213 and 214: Engineering Information Engineering
Page 215 and 216: Engineering Information Engineering
Page 217 and 218: Mounted Bearings Replacement Bearin
Page 219 and 220: Mounted Bearings Replacement Bearin
Page 221 and 222: Mounted Ball Bearings PS Series Pre
Page 223 and 224: Mounted Ball Bearings L/H Series Pi
Page 225 and 226: Mounted Ball Bearings SL/SH Series
Page 227 and 228: Mounted Ball Bearings MB Series Pil
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Mounted Ball Bearings XL2/XL3 Serie
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Mounted Ball Bearings F/T Series Fl
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Mounted Ball Bearings SF/ST Series
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Mounted Ball Bearings MBP Series Pi
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Mounted Bearings TU Series Take-Up
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Engineering Information Analysis of
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Engineering Information Mounted Bal
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Engineering Information Application
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Notes F 240 Boston Gear 800-825-654
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Roller Chains Description of Roller
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Roller Chains ANSI Standard Double,
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Engineering Information Conveyor Ch
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Engineering Information Conveyor Ch
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Notes G 250 Boston Gear 800-825-654
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Roller Chains Hollow Pin Single and
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Ladder Chain Steel-Stainless Steel-
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Chain Pullers The Boston Chain Pull
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Chain Drives Roller Chain Sprockets
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Roller Chain Drives Horsepower Rati
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Roller Chain Drives Horsepower Rati
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Roller Chain Drives Selection SPEED
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H Miniature Chain Sprockets Single
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Roller Chain Sprockets Single Stran
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H Roller Chain Sprockets Single Str
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Block Chain Sprockets Type B Single
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Ladder Chain Sprockets Type B Singl
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Roller Chain Drive Tensioners Type
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Roller Chain Drive Tensioners Type
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Engineering Information Spur Gears
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Engineering Information Spur Gears
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I Engineering Information Spur Gear
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Engineering Information Helical Gea
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Engineering Information Helical Gea
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Engineering Information Miter and B
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Engineering Information Worms and W
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Engineering Information Couplings A
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Engineering Information General I M
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Engineering Information Sprockets I
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Engineering Information Sprocket Di
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Engineering Information Temperature
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Engineering Information Metric Conv
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Engineering Information Application
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Index to Catalog Numbers Catalog Nu
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Index to Catalog Numbers I Catalog
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Altra Industrial Motion All Custome
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Modified Stock Gearing - Boston Gear

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