Boston Gear 700 Series Double Reduction Worm Gear

Our standard 700 Series – the heart of Boston Gear’s speed reducer product line – has been serving industry reliably for over 40 years. Its proven modular design has set the industry standard for performance and is the most imitated product in today’s worm gear speed reducer market. But why settle for a knock-off when you can have the original – from Boston Gear.

CATALOG & MANUALS

 
CatalogBoston Gear 700 Series Double Reduction Worm Gear Catalog
Users ManualBoston Gear 700 Series Double Worm Gear Installation and Operation
DimensionsBoston Gear 700 Series Double Reduction Worm Gear Dimensions
Order FormBoston Gear 700 Series Double Reduction Worm Gear Order Form

Double Reduction Numbering System / How to Order

When ordering reducers please include code letters for Style, Size,
Base (if required), Ratio, Lubrication (if required), NEMA Mounting (if
flanged reducer), Shaft Assembly and Motor (if required).

EXAMPLE:
Required size, 726 Quill types flanged double reduction reducer, 100 to 1 ratio, 5/8” input bore, parallel shafts, standard assembly, no base.
 Motor to be 3/4 HP, 1750 RPM, 230/460 Volt, 3 Phase, 60 cycle, Open Dripproof.

Style – Designates reducer or flanged reducer, projecting or hollow output shaft.

CDesignates cast iron flange and base. (Standard on motor flanges 3 HP (180TC) and up and all bases except horizontal (710-726).
WADouble reduction, parallel shaft reducer with projecting output shaft.
HWADouble reduction, parallel shaft reducer with BostMount
hollow output shaft.
SWADouble reduction, parallel shaft reducer with hollow output shaft.
WCDouble reduction, right angle shaft reducer with projecting
output shaft.
HWCDouble reduction, right angle shaft reducer with BostMount hollow output shaft.
SWCDouble reduction, right angle shaft reducer with hollow output shaft.
FWADouble reduction, parallel shaft flanged reducer (Quill types) with projecting output shaft.
HFWADouble reduction, parallel shaft flanged reducer (Quill types) with BostMount hollow output shaft.
SFWADouble reduction, parallel shaft flanged reducer (Quill types) with hollow output shaft.
FWCDouble reduction, right angle shaft flanged reducer (Quill
types) with projecting output shaft.
HFWCDouble reduction, right angle shaft flanged reducer (Quill
types) with BostMount hollow output shaft.
SFWCDouble reduction, right angle shaft flanged reducer (Quill
types) with hollow output shaft.
QCWADouble reduction, parallel shaft flanged reducer (Coupling
types) with projecting output shaft.
HQCWADouble reduction, parallel shaft flanged reducer (Coupling
types) with BostMount hollow output shaft.
QCWCDouble reduction, right angle shaft flanged reducer
(Coupling types) with projecting output shaft.
HQCWCDouble reduction, right angle shaft flanged reducer
(Coupling types) with projecting output shaft.
SSFWB/SSFWDStainless steel double reduction with solid output shaft.
SSHFWB/SSHFWDStainless steel double reduction with hollow output shaft.

SIZE – Center distance, rounded off. On double reduction models this is the Center Distance of the second reduction.

713 – 1.33
718 – 1.75
721 – 2.06
726 – 2.62
730 – 3.00
732 – 3.25
738 – 3.75
752 – 5.16
760 – 6.00

BASE – Base positions relative to output shaft. Shipped separately as Base Kits.

BlankNo base kit
A,BHorizontal bases
C,D,E & FVertical Bases
R/LBostMount Output Bracket
XInput Vertical Up
YInput Vertical Down
V,WFlanged bases, available on “S” hollow shaft models only.
Factory assembled.
M,NHollow Output with CFA

Lubrication Optional Prelubrication.

Blank – No Lubrication supplied.
K – Klubersynth UH1 6-460
S – Mobil SHC 634
X – Mobil 600W
*When specifying optional prelubrication, include
mounting position after shaft assembly.

VENT – Pressure Relief.

Blank – Standard Vent
P – 5 PSI Vent
Z – PosiVent® Pressure Compensationg Bladder
When specifying optional prelubrication, include mounting
position after shaft assembly.

Input Oil Seals

Blank – Standard Seal
T – Double Input Seals. Recommended for mounting positions
2, 3, 4, 6

Nema – Designates flange size and input bore diameter. Flanged reducers only. Leave blank for projecting input reducers.

Shaft Assembly
Assembly shaft arrangements.
G* – Standard assembly
H* – Double output shaft projection
J* – Opposite to standard

* Add “S” after letter for Stainless Steel Shaft (ex. GS, HS, JS)

Double Reduction Speed Reducer Selection Procedure

To properly select a speed reducer, the following application information must be known:

Input RPM (Ratio)
Output Torque
Input Horsepower
Service Factor

Non-Motorized Speed Reducer
1. Determine service factor from table below.
2. Determine design horsepower.
Design Horsepower = Application Load x Service Factor
3. Select a speed reducer size that satisfies output RPM, service class and/or output torque requirements.
4. Check overhung load capacity.

Motorized Speed Reducer
1. Determine service class from table below.
2. Select a reducer size that satisfies output RPM, service class and/or output torque requirements.
3. Check overhung load capacity.

Service Factor Table

For complete AGMA Service Factors and Load Classifications,
see Engineering Section, Pages 349 and 350.

 

Double Reduction Selection Tables
Capacity selection tables on Pages 77-81 list catalog numbers
and ratios of both reducers and gearmotors. Output RPM,
output torque and horsepower are all based on 1750 RPM
input. For motorized reducer selection, select the desired
output RPM and refer to the gearmotor ratings column. For
non-motorized reducers, refer to the reducer gear capacity
columns. For the desired HP, torque and service factor that
satisfies your requirements, a 700 Series basic reducer
number will be indicated. For complete catalog part number,
descriptions and options, refer to Page 70.

Overhung Load
If the output shaft of a speed reducer is connected to the
driven machine by other than a flexible coupling, an overhung
load is imposed on the shaft. This load may be calculated as
follows:
OHL = 2TK
     D
OHL = Overhung Load (LB.)
    T = Shaft Torque (LB.IN.)
    D = PD of Sprocket, Pinion or Pulley (IN.)
   K = Load Connection Factor

Load Connection Factor
Sprocket or Timing Belt ……………………………………………… 1.00
Pinion and Gear Drive ……………………………………………….. 1.25
Pulley and V-Belt Drive ………………………………………………. 1.50
Pulley and Flat Belt Drive ……………………………………………. 2.50

An overhung load greater than permissible load value may be
reduced to an acceptable value by the use of a sprocket, pinion
or pulley or a larger PD. Relocation of the load closer to the
center of reducer will also increase OHL capacity.

Permissible overhung loads and output shaft thrust loads are
listed for each reducer in the tables on Pages 30-33.

Maximum Input Speeds
W713, W718, W721, W726 ……………………………………… 4500 RPM
W730 through W760 ……………………………………………….. 3600 RPM

NOTE : Horsepower ratings for 1750 RPM should NOT be
exceeded when operating at higher input speeds.

 

Dimensions