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Modified Stock Gearing - Boston Gear

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Worms & Worm <strong>Gear</strong>s<br />

4 Diametral Pitch (Bronze & Cast Iron Worm <strong>Gear</strong>s,<br />

Steel Worms – Unhardened & Hardened)<br />

Pressure Angle – 14-1/2°<br />

RATIO = <strong>Gear</strong> Teeth ÷ Worm Threads<br />

RH = RIGHT HAND — LH = LEFT HAND<br />

All others stocked RIGHT HAND ONLY.<br />

D<br />

FACE<br />

*<br />

HUB<br />

PROJ.<br />

BORE<br />

HUB<br />

DIA.<br />

PITCH<br />

DIA.<br />

STANDARD TOLERANCES<br />

DIMENSION TOLERANCE<br />

BORE All ±.0005<br />

WORM LEAD and LEAD ANGLE<br />

LEAD .7854<br />

LEAD ANGLE 4°46´<br />

ALL DIMENSIONS IN INCHES<br />

ORDER BY CATALOG NUMBER OR ITEM CODE<br />

4<br />

FACE = 1.500" *CENTER LINE WORM TO FLUSH END = .750"<br />

WORM<br />

DIAMETRAL PITCH<br />

GEARS<br />

Style<br />

No. Hub See SINGLE Thread<br />

of Pitch Page Catalog Item<br />

Teeth Dia. Bore Dia. Proj. 315 Number Code<br />

BRONZE<br />

20 5.000 GB1100 13688<br />

1.000 2.50 1.25 B<br />

24 6.000 GB1101 13690<br />

CAST IRON<br />

G1100RH 13230<br />

20 5.000<br />

G1100LH 13232<br />

1.000 2.50<br />

G1101RH 13234<br />

24 6.000<br />

G1101LH 13236<br />

1.25 B<br />

G1102RH 13238<br />

32 8.000<br />

1.250 3.00 G1102LH 13240<br />

40 10.000 G1103 13242<br />

48 12.000 G1104 13244<br />

1.500 3.50<br />

64 16.000 D G1105 13246<br />

PITCH<br />

DIA.<br />

BORE<br />

REFERENCE PAGES<br />

FACE<br />

Alterations — 314<br />

Horsepower Ratings — 97, 98<br />

Lubrication — 314<br />

Materials — 315<br />

Selection Procedure — 96<br />

KEYWAY<br />

4 WORMS FOR ABOVE GEARS<br />

DIAMETRAL PITCH<br />

SINGLE Thread<br />

Hub<br />

Pitch Catalog Item<br />

Dia. Face Bore Dia. Proj. Number* Code<br />

UNHARDENED – STEEL<br />

G1106KRH 12876<br />

3.500 1.250 – –<br />

3.000 G1106KLH 12878<br />

4.500 1.250 – – L1106 12908<br />

HARDENED STEEL<br />

3.500 1.250 – – H1106 12976<br />

3.000 4.500 1.250 – –<br />

HL1106 13014<br />

5.750 HP1106 13034<br />

*All worms furnished with .313 keyway.<br />

Hardened Worms have ground and polished threads.<br />

94 <strong>Boston</strong> <strong>Gear</strong> 800-825-6544 P-1930-BG 04/10

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