Adjustable Motor Bases

Sliding and Tilting Bases

It is necessary to change the distance between the motor and driven shaft in order to change speed with an adjustable center drive. The best way to do this is with an adjustable motor base. Lovejoy offers four basic types of motor bases to satisfy requirements of space, convenience, interchangeability, motor frame size, and economy.

Models: 135, 145-60, 301, 302-3, 403, 305-8 and 310-30

The original Lovejoy design, made of durable cast iron and steel.

For remote control in hazardous or inconvenient locations, Lovejoy offers electric servo motor-controlled bases in some models of the cast iron bases, both direct coupled (ERC) and chain-driven (MRC). Also, stainless steel guide rods and adjusting screws are available on some models for severe environments or applications subject to wash down.

Adjustable Motor Bases

Sliding and Tilting Bases

It is necessary to change the distance between the motor and driven shaft in order to change speed with an adjustable center drive. The best way to do this is with an adjustable motor base. Lovejoy offers four basic types of motor bases to satisfy requirements of space, convenience, interchangeability, motor frame size, and economy.

SMB motor bases are extremely low profile and made of strong, lightweight steel, plated for protection against rust and corrosion. A folding knurled adjusting handle replaces the common round hand wheel to offer easy speed adjustment with minimum effort and no tools. Adjustable maximum and minimum speed stops are included. The adjusting handle is easily removed for the addition of a sprocket or universal joint to adapt to existing control methods.

For remote control in hazardous or inconvenient locations, Lovejoy offers electric servo motor controlled bases in the SMB style, both chain-driven (MRC) and direct coupled (ERC). Both types come complete with motor, control, and wiring diagram.

Sliding Dovetail Type
Models: 48/56 LA and 48/56 LB

These are the most compact, lowest-priced sliding motor bases offered by Lovejoy.

The Model 48/56 LA comes with a convenient hexagon head adjusting screw for use with your adjustable or socket wrench for fast speed change, and has a profile height of only 1-1/2 inches. The Model 48/56 LB is equipped with a hand wheel and riser blocks that make tool-free adjustment quick and easy.

This economical bases featues pivotal rather than sliding movement and is designed for use with NEMA 48 and 56 motor frames. Less space is required to move the motor through the entire speed range because of the use of tilting motor rails. Ideal for belt tensioning and for easy belt change with cone step pulleys. Can be mounted in any position for added versatility.

Econoline fixed center drives utilize the same type of spring-loaded pulley as an adjustable center drive, only it is normally mounted on the driven shaft. The driver pulley is of similar size and construction, but it is manually adjustable. A fixed center drive offers greater driven speed range in a more compact space. There are two types of controllable pulleys: the M type with a hand wheel and built-in adjusting device, and the MLA type that uses an external control. The MLA type pulley can be used with the Lovejoy #76 Control Stand or some other type of linear controller.

A motorized control feature is available for all three drive packages, making it possible to convert from the standard handwheel to convenient remote control. This option consists of a servo motor that opens and closes the driver pulley flanges from a separate control station, allowing accurate speed adjustment in locations that may be inconvenient, remote or hazardous. Conversion is easy, requiring only the removal of the hand wheel and torque rod from the standard manual pulley, installing the motorized torque arm in place of the hand wheel, and connecting the CN2601 control switch to the servo motor and power source.

Fixed center drive assemblies require a torque arm bracket to prevent the hand wheel from spinning. This allows speed to be changed while the drive is running. This bracket may be used with Econoline, WB, Hi-Ratio, and Hexadrive Fixed Center Drives. Bracket is NOT needed with the MLA type pulley.