Duff-Norton Accessories

Encoders are used to synchronize, position, or vary the speed of an electric motor.

• The encoder is a sensing device that provides feedback. Encoders convert motion to an electrical signal that can be read by some type of control device in a motion control system, such as a counter or PLC.

Pillow Blocks are designed to operate with actuators, shafts, and couplings. Pillow Blocks may be used in any shafting configuration for additional shaft support.

• Ductile iron housing - for extra strength vs. the standard gray iron.
• Setscrew locks - to properly secure the connecting shaft regardless of direction.
• Anti-Rotation Pins - to help prevent random bearing movement.

Flange Blocks lock on to the end of the rotating screw, and can then be bolted on to the machine or fixture. This ensures that the load being carried by the actuator’s lifting nut is properly guided.

• Ductile iron housing - for extra strength vs. the standard gray iron.
• Setscrew locks - to properly secure the connecting shaft regardless of direction. 
• Anti-rotation Pins - to help prevent random bearing movement.

The hand wheel is for actuators that require precise positioning, or have loads which do not require motorized power to adjust.

• Easy installation to existing actuators. All hand wheels are bored, keyed, and set-screw drilled to the proper dimensions.
• Revolving handle design for rotational ease.
• Recessed hub and spoke design.
• Cast iron material with chrome plating.

Rotary Counters provide an economical and easy way to determine an actuator’s position.

• Display readings have been pre-matched to the actuator’s ratios.
• Display reading has been extended to the nearest Thousandths of an inch.
• Clockwise and counter clockwise models available.
• Easy mounting kits available for installation to existing field actuators.

The Position Feedback Potentiometer/Transducer is designed to mount on the end of any SKA6000T limit switch. Its active component is a precision potentiometer which may be used as voltage divider to provide a feedback voltage that is proportional to actuator position.

• Multiple gear ratios allow for a wide range of raises.
• Standard resistance is 5000 ohms. Other resistances are available on special order. 
• Power rating: 2 watts at 40°C
• Maximum service temperature: 85°C
• Interface directly with the Model SK6300-4K Digital Position Indicator to provide a scalable readout of position. The SKA6205 series models can also be used with most motor controls that have provision for potentiometer feedback signal.
• Transducer supplied with black anodized finish as standard.

The Rotary Union Limit Switch design provides the ultimate in adjustability with even higher accuracy than a cam switch.

• Switches rated 15 amps, 125-277 VAC; 1/2 amp, 125 VDC; 1/4 amp, 250 VDC.
• Switches SPST-N.C. SPDT available.
• Adaptable to all Duff-Norton mechanical actuators 2 ton and larger.
• Sturdy and compact, corrosion-resistant aluminum housing and cover, NEMA 4 enclosure rating, threaded 1/2 inch NPT conduit opening, brass nuts travel on stainless steel shaft.
• Easy to adjust, slotted traveling nuts allow precise fine-adjustment without the trial and error of cam type switches.
• Three available ratios to serve different travel requirements, while optimizing repeatability.
• Operating temperature, -20° to 150°F. Lifetime lubricated with synthetic grease.
• Can be mounted on either side of actuator, in four 90° orientations.
• May be ordered on actuators close-mounted to shortened worms, reducing actuator width.
• Additional rotary limit switches available with 4 positions, or for hazardous locations, consult factory.

The use of a bellows boot for is highly recommended most actuator applications. Duff-Norton can provide bellows boots for the most stringent application requirement.

• Protects the lifting screw from: dust, dirt, moisture, and corrosive contaminants.
• Helps maintain the proper lubrication.
• Can be provided for all actuator screw end types and configurations.
• Standard bellows boots are made of neoprene coated nylon with sewn construction.
• Special bellows boots can be provided with a variety of materials for applications involving high temperatures, highly corrosive atmospheres, and other special conditions.
• Bellows boots can also be provided from molded materials, with internal or external guides to prevent sagging, and with zippers for easy installation or removal.

Duff-Norton can competitively supply motors for any application from suppliers such as Baldor, Nord, US Electric, Leeson, and more.

Motors can be directly mounted to most Duff-Norton actuators using C-face adapters, directly mounted via speed reducers, or remotely mounted with shafting and couplings. IEC, servo, hydraulic, and air motors can also be supplied upon request.

Standard Motors Include:

• Brake and non-brake models
• Single and three phase models
• Explosion proof, washdown duty
• Wide variety of voltages and RPM’s
• 50/60Hz models
• 1/4 to 10 Horsepower ratings
• Common NEMA frame size

Motor adaptors allow direct coupling of motor shaft with either the left or right side actuator input shaft.

• Allows direct coupling of motor shaft with either the left or right side actuator input shaft.
• Comes with coupling, keys, and mounting hardware.

The Digital Position Indicator processes a feedback signal from the potentiometer to provide position readout. The indicator automatically scales the input signal to provide linear readout over the full travel length.

Digital Position Indicators:

• Self scaling by inputting minimum and maximum readings – either by key stroke or input signal.
• Two adjustable up / down limits with 0 to +/- 99999.
• Accepts 1K to 10K potentiometer inputs.
• Programmable decimal point location.
• Input power requirement from 85 – 250 VAC.
• Programmable front panel functions.
• For use with 2 through 150 ton machine or ball screw actuators.

Power transmission systems frequently use multiple actuator arrangements. Such systems commonly use mitre boxes to effectively position and equally distribute loads.

• 98% average efficiency ratings.
• Carburized and case hardened bevel gears.
• Alloy steel input/output shafts for greater strength.
• Anti-friction bearings on all shafts.
• MB-4 and MB-8 models come with lifetime lubrication, stainless steel shafts and aluminum housings.

Duff-Norton connecting shafts, which are furnished with close tolerance turned, ground, and polished steel for smooth rotation.

• Turned, Ground, and Polished steel
• Shaft material is machined from cold-drawn bar.
• Furnished with ANSI-standard in-line keyways.
• Coordinates well with Duff-Norton Couplings and Block Supports.

Duff-Norton provides three coupling types which have been tailored to specific actuator requirements: Chain, Jaw, and Flex Rigid.

Gear Couplings

• Integrates well with Duff-Norton mid and larger capacity actuators.
• High torque capacities.
• Standard ANSI dimensions, straight bore diameters.
• Common bore diameters may be custom ordered.
• Special bore diameters may be custom ordered.
• Long service lives.
• Easy fit onto the actuator’s worm shaft.
• Allows for incremental system adjustments.