Martin's Pocket Guide to Gears

MTO's in Days, Not Weeks! Not Days, in MTO's

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gears you need, in stock, Now! stock, in need, you gears

for the the for Call Martin

https://btweb.martinsprocket.com/customermenu/

line Gear Part Number Interchange Number Part Gear line

Martin

available in DP, CP & Modular pitches. Modular & CP DP, in available

Gear Gauges Gear Martin

Circular Pitch INFORMATION NEEDED ADDENDUM OUTSIDE PITCH DIAMETER TO QUOTE GEARS DIAMETER WHOLE DEPTH

WORKING DEPTH DEDENDUM 1. Type of Gear BOTTOM OR ROOT DIAMETER 2. Pitch (3DP, 4CP, 2MOD, etc.) CLEARANCE FACE 3. Number of teeth COMMON FORMULAS 4. Pressure angle (141/2º, 20º)

5. Face width N + 2 N CP= Circular Pitch OD = DP = N = Number of Teeth PD 6. Material (1144, 1040, 4140, etc.) DP DP= Diametral Pitch PD= Pitch Diameter HUB OD= Outside Diameter O.D. 7. Hardened teeth? 3.1416 N + 2 CP = DP = CD= Center Distance DP OD Dr= Driver 8. Style of gear (A, B, C) Dn= Driven PD(Dr) + PD (Dn) N 9. Hub outside diameter CD = PD = SIZING EXAMPLE: 2 DP Gear with 46 teeth has 10. Length through bore or hub projection an OD of 6" HUB 25.4 N Large 46 + 2 DP = 8 PROJ. Module Pitch = Ratio = DP= 6 11. Bore DP N Small 12. Keyway size 3.1416 Distance Traveled (Inches) = X N 13. Number and size of setscrew(s) By Rack Pinion in One Revolution DP

14. Special features Worm Ratio = N in Worm Gear # Leads www.martinsprocket.com

MTO's in Days, Not Weeks! Not Days, in MTO's

Same Day / Next Day Rebores, Rebores, Day Next / Day Same

gears you need, in stock, Now! stock, in need, you gears

for the the for Call Martin

https://btweb.martinsprocket.com/customermenu/

line Gear Part Number Interchange Number Part Gear line

Martin

available in DP, CP & Modular pitches. Modular & CP DP, in available

Gear Gauges Gear Martin

Circular Pitch INFORMATION NEEDED ADDENDUM OUTSIDE PITCH DIAMETER TO QUOTE GEARS DIAMETER WHOLE DEPTH

WORKING DEPTH DEDENDUM 1. Type of Gear BOTTOM OR ROOT DIAMETER 2. Pitch (3DP, 4CP, 2MOD, etc.) CLEARANCE FACE 3. Number of teeth COMMON FORMULAS 4. Pressure angle (141/2º, 20º)

14. Special features Worm Ratio = N in Worm Gear # Leads www.martinsprocket.com SAMPLE IDENTIFICATION HINTS GEAR TROUBLESHOOTING • Use Martin Gear Gauges to determine pitch and pressure angle. • Excessive gear wear can be caused by improper lubrication, Available for diametral, circular and modular pitches. environmental contaminants or the application H.P. being too high. • Spur gear teeth are cut straight across the face of the gear and run Always check H.P. and speed to ensure safe operation. together or on rack. • Worm gears have teeth cut at an angle to the axis. • Gear breakage normally is caused by shock or overload conditions. • Threads of a right hand worm or worm gear lean to the right when Also check for adequate cover for drive from surrounding placed on a flat surface, and lean to the left for left hand. environmental materials. • The tooth portion of bevel and miter gears is in the shape of a • Excessive drive noise is caused by improper backlash, a misaligned section of a cone. drive, worn gears or too high a drive speed. • Bevel gear pairs have a different number of teeth on each mating gear, while miter gears have the same number (1:1 ratio). • Additional gear strength to correct wear & breakage can be achieved • Find Martin's online gear part number interchange at through hardening, changing pressure angle, increasing face width, https://btweb.martinsprocket.com/customermenu/ . increasing pitch and changing materials. • Contact Martin for help with those hard to identify samples! And remember, 14.5º and 20º gears will not run together.

Martin GEAR NOMENCLATURE T S 3 24 H 2 KW SS

20º STEEL DP # OF TEETH HT BORE KW SET SCREW (Typical Spur Gear Nomenclature)

Rack Bevel Gears Spur Gears R = Rack — Steel B = Bevel — Cast Iron S = Steel RA = Rack — Steel Heavy Backing Gears TS = Steel 20° TR = Rack — Steel 20° Heavy Backing B = Bevel — Steel Pinions C = Cast R20 = Rack — Steel 20° Wide Face BS = Bevel — Steel Gears TC = Cast 20° BS = Bevel — Steel Pinions H = Hardened Teeth Note: B steel pinions NM = Non-Metallic may run with BS gears of same ratio

ANY RATIO OTHER THAN 1:1 Examples Examples (Pinion and driven gear S620 (Steel 6P 20T-141⁄2°PA) R6X2 (141⁄2° STD Backing 6PX2' Long) have different number of teeth.) TS620 (Steel 6P 20T-20°PA) RA6X4 (141⁄2° Heavy Backing 6PX4' Long) Examples C660 (Cast 6P 60T-141⁄2°PA) TR6X6 (20° STD Width 6PX6' Long) B1040-2 (Cast 10P 40T 2:1 Ratio) S620H (Steel 6P 20T-Hardened 141⁄2°PA) R206X6 (20° Wide Face 6PX6' Long) B1020-2 (Steel 10P 20T 2:1 Ratio) NM620 (Non-Metallic 6P 20T-141⁄2°PA) BS1040-2 (Steel 10P 40T 2:1 Ratio) S612BS1 (Steel 6P 12T 1" Bore KW SS) BS1020-2 (Steel 10P 20T 2:1 Ratio) TS816BS7/8 (Steel 8P 16T 20ºPA .875 Bore KW SS)

Miter Gears Worm Worm Gears M = Miter — Steel W = Worm — Steel W = Worm Gear — Gears WH = Worm — Steel With Cast Iron A or B = Larger Bore (Suffix) Hub Projection WB = Worm Gear — Bronze HM = Miter-Hardened WG = Worm — Steel D or Q = Double or Teeth Hardened Ground Quadruple Thread K = KW & SS Threads (Suffix) WHG = Worm — Steel ALWAYS Hardened Ground 1: 1 RATIO Threads With Hub (Same number of teeth on Projection each mating gear.) D or Q= (Suffix) Double or Quadruple Thread

Examples Examples Examples M824 (Steel 8P 24T) W6 (Steel 6P Right Hand) W660 (Cast Iron 6P 60T Right Hand) M824A (Steel 8P 24T Larger Bore) WH6 (Steel with Hub Projection 6P Right Hand) WB660 (Bronze 6P 60T Right Hand) M2424BR (Brass 24P 24T) WG6 (Steel-Hardened Ground Threads 6P Right Hand) W660D (Cast Iron 6P 60T Double Thread Right Hand) HM1020 (Steel-Hardened Teeth 10P 20T) WHG6 (Steel with Hub Projection Hardened Ground Threads 6P NOTE: Worms and worm gears come standard as HMK1020 (Steel-Hardened 10P 20T With KW & SS) Right Hand) right hand. If left hand is needed, it must be W6D (Steel 6P Double Thread Right Hand) specified.

MTO's in Days, Not Weeks! Not Days, in MTO's

Same Day / Next Day Rebores, Rebores, Day Next / Day Same

gears you need, in stock, Now! stock, in need, you gears

for the the for Call Martin

https://btweb.martinsprocket.com/customermenu/

line Gear Part Number Interchange Number Part Gear line

Martin

available in DP, CP & Modular pitches. Modular & CP DP, in available

Gear Gauges Gear Martin

Circular Pitch INFORMATION NEEDED ADDENDUM OUTSIDE PITCH DIAMETER TO QUOTE GEARS DIAMETER WHOLE DEPTH

WORKING DEPTH DEDENDUM 1. Type of Gear BOTTOM OR ROOT DIAMETER 2. Pitch (3DP, 4CP, 2MOD, etc.) CLEARANCE FACE 3. Number of teeth COMMON FORMULAS 4. Pressure angle (141/2º, 20º)

14. Special features Worm Ratio = N in Worm Gear # Leads www.martinsprocket.com