Product Info | Applications | Operating Info. | Ordering Info. | Dimensions | Specs

Printable PDF Datasheet

DR Positioning Stage

 Product Info:

The DR stage is a low profile, wider footprint, enclosed positioning stage. It is used in closed loop positioning applications that require high speed and high accelerations of heavier loads.

The iron core coil assembly is magnetically attracted to the stationary magnet assembly, which provides a preload for the bearing system. The dual parallel linear bearing rails with 4 linear recirculating ball bushing guides provide a much higher load carrying capacity. The wide low profile of the stage ensures a stable platform for the payload or as the bottom axis (X axis) of a stacked multi-axis system

The larger size of the stage allows for the mounting of a larger, higher force linear motor.

The DR stage comes standard with bellows (folded way covers) with a 12:1 extension to compression ratio.

The cable carrier is oversized to allow for passage of customer payload cables and hoses. The back of the cable carrier can be easily removed and reattached to route through additional cables.

The DR positioning stage incorporates the latest in linear motion technology.

• Motors: Non-contact 3 phase brushless , low cogging, iron core linear motor, commutated either sinusoidally or trapezoidally with Hall Effects. The encapsulated laminated coil assembly moves and the multi-pole single sided permanent magnet assembly is stationary. There is a large magnetic attractive force which provides a preload for the bearing system.
• Bearings: Linear guidance is achieved by using a 2 parallel linear rail with 4 linear recirculating ball bearing guides. The bearing guides are sealed with wipers to contain the lubrication and to keep out debris. Periodic lubrication of the guides is recommended.
• Encoders: Non-contact glass or metal scale optical linear encoders with a reference mark for homing. Multiple reference marks are available and are spaced every 50 mm down the length of the scale. Typical encoder output is A and B square wave signals but sinusoidal output is available as an option

• Limit Switches: End of travel limit switches are included at both ends of the stroke. The switches can be either active high (5V to 24V) or active low. The switches can be used to shut down the amplifier or to signal the controller that an error has occurred. The limit switches are typically an integral part of the encoder, but can be mounted separately if required.
• Cable Carriers: Cable guidance is achieved by using a cable carrier. Cable carriers are oversized to allow for routing of customers hoses and cables
• Bellows: The DR comes standard with neoprene / nylon bellows with Mylar stiffeners.
• Hard Stops: Hard stops are incorporated into the ends of the stage to prevent over travel damage in the event of servo system failure.

Advantages:

• Wide footprint, very stable platform     
• Highest output force stage
• Available in 3 different widths
• Enclosed with bellows
• High Speed

 Applications:

• Pick and Place        
• Vision Inspection
• Parts transfer
• Clean room

 Operating Info:

Required Electronics:
The motor requires a 3 phase brushless amplifier with power supply, that is rated with sufficient current and voltage to meet the motion requirements. The inductance of the linear motor coil should be greater than the minimum load inductance of the servo amplifier. A programmable motion controller is required to close the position loop on the system.

Environmental Considerations:
The stage is a precision device with sensitive components, it should not be mounted in an environment that is wet or excessively dirty. The optical encoder scale is open and it should be kept free of debris in order to operate properly. The stationary magnetic assembly is highly magnetic, it should not be placed in an area where loose steel particles can be drawn towards the open magnetic surfaces. The stage must not be mounted in an environment with high ambient temperatures.

Mounting:
The stage should be mounted to flat and stiff surface. Counter bored thru holes are present in the stage to allow for the mounting of the stage to the customers system. The moving table assembly has threaded holes on the top surface for attaching the payload. The stage may be mounted in any orientation. When mounting the stage with the table moving vertical, it should be noted that the stage will be required to generate additional force due to gravity and that the stage will slide down to the bottom hard stop when power fails.

Maintenance:
The ball bearing guides in the stage should be periodically lubricated with the manufacturers recommended grease. The open glass encoder scale should be wiped with a glass cleaner occasionally to ensure trouble free operation.

 Ordering Info:

Stages can be ordered for any stroke up to 160 inches and any continuous force up to 479 lbs. The stages are built as the orders are placed, they are not stocked, as each customer requirement is different.

 Dimensions:

Click here for a Hi-Res PDF datasheet for printing.
Click HERE to download a viewer with 3-D CAD drawings of the DR stage,
Or click HERE to download a viewer with 3-D CAD drawings of the Extrustion DR Stage.

 Specifications:

Flatness	±.0008” /ft	±66 micron / meter
Straightness	±.0009” /ft	±74 micron / meter
Accuracy*	±.0007” /ft	±57 micron / meter
Repeatability*	±.0003”	±7.5 micron
Load Capacity	442 lbs	200 Kg
(* Encoder dependent)

 Custom Application Samples:

DUAL RAIL POSITIONING STAGES

XYZ Gantry (High Resolution)
X-AXIS = 12” stroke, 20 lbs cont., 50 lbs peak
Y-AXIS = 3” stroke, 20 lbs cont., 80 lbs peak
Z-AXIS = 3” stroke, 10 lbs cont., 40 lbs peak
*Z-Axis counterbalance
*All axis have 0.1 µm resolution encoders

XY Gantry (High Force)
X-Axis = 8.50” stroke, 395 lbs cont. force, 1 µm encoder resolution
Y-Axis = 8.50” stroke, 198 lbs cont. force, 1 µm encoder resolution
*X-Axis has dual linear motors

Long Stroke Dual Encoders
120” stroke, 20 lbs cont., 60 lbs peak force
*Two encoder resolutions, 1 µm & 5 µm

High Force
30” stroke, 160 lbs cont., 450 lbs peak force,
1 µm encoder resolution