Maryland Metrics: How to order: Please prefix the P.T.I. part number or description with R305- example: R305-RAK201-8A

Transcription

1 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm

2 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Spur Gear an Gear Rack Basics Tere are a wie range of parameters tat influence te selection of gears. Strengt of te gear toot is one of te most important factors. Tis is also known as te bening strengt of te toot as allowe by te stress at te toot root uner loa from te mating gear. Surface urability is anoter, wic can be escribe as te allowable tangential force transmitte safely at te pitc circle. Proper lubrication of te gears will also enance te life of te working gears an exten service life. Selecting te proper lubricant an ensuring aequate re-lubrication is also an important consieration. Surface spee of te mating gears is anoter factor to consier. Unlike enclose gears tat are typically flooe in a lubricant, open gears are more subject to contamination an less lubricant. Oter factors tat influence selection inclue operating temperature, moisture, gear alignment, uty cycle an application sock loas. As spees increase, weter on mating circular gears for rotational motion or for gear racks an pinion gears tat create linear motion, iger spees may require groun gears for more precise an quiet movement. Minimizing te backlas, wic is te space between te non-contact sie of mating gear teet, may require gears sets wit a precision fit. Experience also plays an important role especially wen evaluating esign improvements. Consier existing applications an results, concerning life an toot wear can be a goo guie to improve similar applications. Gear life is generally extene wit arene teet, wen contamination as been minimize an wen proper lubrication as been maintaine. Terefore, no one selection criteria can yiel te ieal size, so consiering all te Gear Terms Aenum: Te eigt of te toot measure above te pitc cicle. Backlas: Te play (istance) between mating teet at te pitc cicle. Center istance: Te istance between centers of mating gears. Circular Pitc: Arc lengt of te pitc circle between te centers of oter corresponing points of ajacent teet. Circular Pitc = / iametral Pitc. Clearance: Te raial istance or separation between te top of one toot an te bottom of te mating toot space. Crown: Te face of eac gear toot aving a sligt outwar bulge an tinner on eac en. Tis feature elps accooate sligt misalignments of gear teet or safts on wic tey are mounte. eenum: Te ept of te toot measure below te pitc circle. iametral Pitc: Te ratio of te number of teet to te number of inces of pitc iameter. iametral Pitc = / Circular Pitc. External Gears: Gears wit teet cut on te outsie. Face Wit: Te axial toot lengt. Toot Flank: Te surface between te pitc circle an te bottom of te toot space. Flank: Te working, or contacting, sie of te gear toot. Gear Center: Te center of te pitc circle of te gear. Gear Ratio: Te ratio of te number of teet in mating gear sets. Usually it is te number of teet in te riven gear ivie by te number of teet in riving gear. 373 possible application conitions will yiel te best prouct coice. Te following selection criteria will iscuss typical gear toot pysical parameters an terms. Tese are inustry stanar terms, an intene to form a basis for gear selection. Gears transmit torque an can maintain a rotational or linear spee. ence tey are very popular an an inexpensive coice for power transmission or for controlling linear motion. Te gears in tis catalog are 20 pressure angle an are metric by esign. Tey are available wit an witout a ub an can fit onto te saft by a variety of ways. Te formulas an selection criteria will be te same regarless of weter inc or metric parameters. Metric gears are necessary for proper part replacement on European equipment an suggeste for use on macinery estine for global en use markets were metric replacements may be foun easier. Typical applications inclue Macine Tools, eavy Macinery, Packaging Equipment, Lifts, Positioning Equipment, Robotics, Linear Control Equipment an more. So weter controlling rotational motion, or converting rotational to linear motion, or even clockwise to counter clockwise movement, spur gears offer an economical means for controlling, converting an managing motion efficiently an effectively. Line of Centers: Connects te centers of te pitc circles of two mating gears Outsie iameter: (External gears) Te istance from te top of one toot to te top of a toot opposite measure troug te axis of te gear. Outsie iameter = Number of Teet + 2 / iametral Pitc. Pitc: Te istance between similar, equally space toot surfaces along a given line or curve. Pitc Circle: Circle were mating gear contact occurs. Pitc circles are tangent in mating gears. Pitc iameter: Te iameter of te pitc circle. Pitc iameter = Number of Teet / iametral Pitc. Point of Contact: Any point at wic two toot profiles touc eac oter. Pressure Angle: Te angle between a tangent to te toot profile an a line perpenicular to te pitc surface. Stanar gears are eiter 14-1/2ø or 20ø egree. Root iameter: Te istance from te bottom of one toot to te bottom of a toot opposite measure troug te axis of te gear. Toot Tickness: Te tickness of a toot at te pitc circle. Toot Surface Area: Te contact sies or faces of a gear toot, or te area incluing te toot face an te toot flank. Saft Angle: Te angle between te axis of two non-parallel gear safts. Tis is often referre to as misalignment. Spur Gears: Gears wit straigt teet are always parallel to te axis of rotation. Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm

3 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Spur Gear Selection Formulas & Criteria Te following criteria will provie a guie to gear selection. Steel spur gears in tis catalog are from C45 (C1045) material not arene. Know tere can be many factors in selecting te rigt an exact gear to matc expectations, requirements an criteria. Tere may be many parameters tat impact te selection of gears. Below are some of te basic parameters tat will begin to elp select te rigt gear. For a loaing guie, te rolling stress loa on te toot σ = 589 N/ 2 an allowable bening stress σ = 200 N/ 2. Gear Strengt: Coose te spur gear base on gear strengt. Te permissible bening strengt of a gear is referre to as te allowable tangential force at te pitc circle an relates to te allowable loa on te toot an resulting bening stress in te root of te toot uner loa. Surface urability is te safe force on te toot witout any occurrence of surface failures. Lubrication will be an important consieration for te teet tat mes to keep working surfaces lubricate. Spee of te gears in mes will also play a role as will te type of lubrication. Selection: Te next step is to make an estimate selection base on te torque loa. Allowable torque for eac gear is liste in te catalog pages for eac gear. ifferent manufacturers may use ifferent loaing criteria base on service factors an material stress levels. Tese publise ratings are intene as a guie. Selection Formulas (Metric & Inc Units) escription Formula imension (Units) Number of Teet z = / m Moule m = p / π = / z Pitc iameter = z m Toot Pitc p Face Wit Aenum ia. e = (z + 2) m Pressure Angle α egree Gear Ratio r = z 2 / z 1 = n 1 / n 2 Center istance c = ( ) / 2 = (z 1 + z 2 ) m / 2 T = 9950 P / n Power P kw Spee n rpm Rim Spee v = (Z 1 m n 1 ) /19100 = π e n / 60,000 m/sec Pi π = E-moulus N/ 2 orsepower P = (T 1 x n) / P T 1 in - lbs Troque T 1 = F x R in - lbs Raius or moment arm R in Force F lbs Inc Linear Motion (Rack & Pinion) Formulas Acceleration a = V / t m/sec 2 Time t sec Tangential Acceleration Force (for lifting axis) F T = (m g) + (m a) lb Tangential Acceleration Force (for riving axis) F T = (m g µ) + (m a) lb Coeffieient of Friction of axis µ Mass m lb sec 2 / in Acceleration ue to gravity g 386 in / sec Gear Size is generally proportional to te loa capacity. A arene gear will ave more loa capacity, but may ave less flexibility for absorbing or allowing sock loas or oter application requirements. Groun gears will also improve positioning accuracy. Loa or Service Factors for external ynamic loas will also influence te operation an life of te gear. Te following service factors tat can be applie to te loa will elp exten service life. Lubrication: For periperal spees less tan 0.5 m/s grease will suffice, for periperal spees above 0.5 m/s oil soul be consiere. Safety Factors soul be consiere for safe working loas. Spees: C45 Spur Gears tat are mille (un-groun) can be applie at rim spees up to 12 m/s. As a comparison, groun gears can be applie to 25 m/s. arene gears tat are mille usually ave max limits of 8 m/s ue to toot istortion from te toot arening process. Consier multiple stages of gear sets for ig reuctions. Noise consierations: mille gears are quietest wen el to 5 m/s rim spee. Groun gears woul be suggeste for more continuous operation primarily for minimizing noise. Also low spee applications, manual rives, pinions wit 8-12 teet can be use. For gears wit iger emans, 25 teet or more soul be use. Note: Metric gear ratings are in metric units. Stanar Gear formulas an P- formulas are to te left an formula conversion factors are given below. Care soul be taken to insure unit conversions are accurate. Service Factors rive Uniform Loa Meium Sock Loa eavy Sock Loa Factor Factor Factor Uniform Ligt Sock Meium Sock Conversion Factors: 1 Newton N = lbs 1 Newton N = Kg 1 Kilogram kg = 2.2 lbs 2 e 2 Gear Rack p Pinion C 1 P = Kikowatt (kw) 1 meter m = 3.28 Ft = 39.4 inces 1 inc = e 1 Toot Pitc (p) Toot Pitc (p) Pitc iameter () Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm

4 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Metric Gear Racks for Spur Gears Features: Tolerance on Single Pitc +/- 20µm Tolerance on Sum of Pitces +/- 30µ on 500 Te Quality Grae of te Teet is from 8 to 9 at IN 3962/63/67 Material C 45 E UNI EN Suitable for Continuous Mounting e p Racks S L Lr Gear Rack an Spur Gear wit ub Moule L p e x S kg kg kg kg x 15 M1 x M1 x M1 x M1 x x 17 M1.5 x M1.5 x M1.5 x M1.5 x x 20 M2 x M2 x M2 x M2 x x 25 M2.5 x M2.5 x M2.5 x M2.5 x x 30 M3 x M3 x M3 x M3 x x x 25 M4 x 25 x M4 x 25 x M4 x 25 x M4 x 25 x x x 30 M4 x 30 x M4 x 30 x M4 x 30 x M4 x 30 x x x 40 M4 x 40 x M4 x 40 x M4 x 40 x M4 x 40 x x 50 M5 x M5 x M5 x M5 x x 60 M6 x M6 x M6 x x 80 M8 x M8 x M8 x M2 x 1000 Were: M2 = Moule Size 1000 = Lengt in System Mounting Top Fit Rack For fit & Alignment Tecnical Specification Moule Pitc S L (Lr = Actual Lengt) Teet Lr Teet Lr Teet Lr Teet Lr Note: Stainless Rack available on request. 375 Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm

5 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Metric Spur Gear Moule 1 Straigt Toot Part No: M1B27 M1 = Moule Size B = or A = 27 = Number of Teet Moule () () 376 e Note: FInise bores on request. All imensions in. Ratings base on Permissable Fatigue Strengt an Flank Pressure. e Teet e Moule 1 Ncm 12 M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B60 M1A M1B M1B M1B M1B M1B M1B M1B M1B M1B M1B70 M1A M1B72 M1A M1B75 M1A M1B76 M1A M1B80 M1A M1A M1B90 M1A M1A M1B100 M1A M1A M1A M1A M1A Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm Wt g

6 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Metric Spur Gear wit ub Moule 1.5 Straigt Toot Part No: M1.5B27 M1.5 = Moule Size B = or A = 27 = Number of Teet Moule () () e Note: Finise bores on request. All imensions in. Ratings base on Permissable Fatigue Strengt an Flank Pressure. e Moule 1.5 Teet e Plate type kg Ncm 12 M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B M1.5B72 M1.5A M1.5A M1.5A M1.5A M1.5A M1.5A M1.5A M1.5A M1.5A M1.5A M1.5A M1.5A Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm

7 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Metric Spur Gear wit ub Moule 2 Straigt Toot Part No: M2B27 M2 = Moule Size B = or A = 27 = Number of Teet e Moule () () Note: Finise bores on request. All imensions in. Ratings base on Permissable Fatigue Strengt an Flank Pressure. e Teet 378 e Moule 2 12 M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B M2B72 M2A M2A M2A M2A M2A M2A M2A M2A M2A M2A M2A M2A Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm g

8 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Metric Spur Gear wit ub Moule 2.5 Straigt Toot e Part No: M2.5B27 M2.5 = Moule Size B = or A = 27 = Number of Teet Moule () () Note: Finise bores on request. All imensions in. Ratings base on Permissable Fatigue Strengt an Flank Pressure. e Teet 379 e Moule M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B M2.5B65 M2.5A M2.5B M2.5B70 M2.5A M2.5A M2.5A M2.5A M2.5A M2.5A M2.5A M2.5A M2.5A M2.5A M2.5A M2.5A M2.5A Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm kg

9 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Metric Spur Gear wit ub Moule 3 Straigt Toot Part No: M3B27 M3 = Moule Size B = or A = 27 = Number of Teet Moule () () 380 Note: Finise bores on request. All imensions in. Ratings base on Permissable Fatigue Strengt an Flank Pressure. e e Teet e Moule 3 Kg 12 M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B M3B48 M3A M3B M3B50 M3A M3A M3B M3B55 M3A M3B M3B57 M3A M3B60 M3A M3B M3B65 M3A M3A M3A M3A M3A M3A M3A M3A M3A M3A M3A M3A M3A M3A Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm

10 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Metric Spur Gear wit ub Moule 4 Straigt Toot Part No: M4B27 M4 = Moule Size B = or A = 27 = Number of Teet Moule () () e Note: Finise bores on request. All imensions in. Ratings base on Permissable Fatigue Strengt an Flank Pressure. e Teet 381 e Moule 4 12 M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B M4B38 M4A M4B M4B40 M4A M4B45 M4A M4B48 M4A M4B50 M4A M4A M4A M4A M4B60 M4A M4B65 M4A M4A M4A M4A M4A M4A M4A M4A M4A M4A M4A Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm kg

11 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Metric Spur Gear wit ub Moule 5 Straigt Toot Part No: M5B27 M5 = Moule Size B = or A = 27 = Number of Teet Moule () () 382 e Note: Finise bores on request. All imensions in. Ratings base on Permissable Fatigue Strengt an Flank Pressure. e Teet e Moule 5 12 M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B M5B32 M5A M5A M5B M5B38 M5A M5B40 M5A M5B M5A M5A M5A M5A M5B55 M5A M5A M5B60 M5A M5A M5A M5A M5A M5A M5A M5A M5A M5A M5A M5A kg Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm

12 Marylan Metrics: ow to orer: Please prefix te P.T.I. part number or escription wit R305- example: R305-RAK201-8A Metric Spur Gear wit ub Moule 6 & 8 Straigt Toot e e Part No: M6B20 M6 = Moule Size B = or A = 20 = Number of Teet Moule () () Teet e Moule 6 12 M6B M6B M6B M6B M6B M6B M6B M6B M6B M6B30 M6A M6A M6A M6B40 M6A kg Part No: M8B20 M8 = Moule Size B = 20 = Number of Teet Note: Finise bores on request. All imensions in. Ratings base on Permissable Fatigue Strengt an Flank Pressure. Teet e Moule 8 12 M8B M8B M8B M8B M8B M8B M8B M8B M8B40** Note: ** Wele ub kg 383 Orer from MARYLAN METRICS P.O. Box 261 Owings Mills, M USA p: (410) (800) fx: (410) (800) web: ttp://mmetric.com sales@mmetric.com RFQ form: ttp://mmetric.com/rfq.tm