Adjustable Motor 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.
 

Styles Available

• Sliding "SMB" Type 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 U-Joint to adapt to existing control methods. There are three sizes available to fit NEMA motor frames from fractional through 15 horsepower. Simple installation is provided by a one-piece motor mounting plate. The best possible belt alignment is maintained because the motor shaft remains perpendicular to the plane of adjustment. This type is slotted for standard NEMA motor frame mounting, but can be drilled for special mounting sizes to offer flexibility of design.
• Sliding Cast Iron Type The original Lovejoy design, made of durable cast iron and steel features independent, slotted motor mounting rails to offer greater flexibility of design, as they can be used to mount NEMA motor frames as well as IEC motors and other products (gearmotors, gear reducers, etc.). Models are available to accommodate motors from fraction through 30 horsepower and adjustable maximum and minimum speed stops are included.
• Sliding Dovetail Type The Sliding Dove Tail types are the most compact, lowest price sliding motor base offered by Lovejoy. These feature easy motor mounting and speed adjustment due to the one-piece top plate, which is slotted for NEMA 48 and 56 motor frames. The Sliding Dovetail types are so cost effective they can be used as belt tensioning bases. They are also exceptionally durable and made from tough steel construction.
  Tilting Type The Tilting Types are economical bases featuring pivotal rather than sliding movement. They are 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. These types can also be mounted in any position for added versatility.
  

Companion Sheaves

Lovejoy companion sheaves are made of durable cast iron to assure best possible wear at the belt contact area. Grooved sheaves, for use with V-V adjustable center drives, are machined to match the belt width and angle of standard variable speed belts for optimum efficiency. The spoke design provides strength and light weight. All companion sheaves are precision balanced for smooth running.
 
Variable Speed Belts

Lovejoy variable speed belts are designed for long life, even tracking, smooth running, and efficient transmission of power through wide speed ranges. They are made of special synthetic compounds to provide maximum service in conditions where oil, heat (up to 200 degrees F), and static are present. Maximum recommended belt speed is 5,600 feet per minute.