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Since 1977!

Highest Precision!

Best Quality

       +
Engineering
Support!

Our engineering expertise is available
to provide
technical support
for the products
we sell; and assist
our customers
in solving
their engineering
problems.


 

 

The Fundamental  Operation of  SEL Series Rack & Pinion Linear Encoder or Resolver Measuring Systems
(navigational structure)

   
Page 1
Rack and Pinion Mesh Geometry

Page 2

Long Life & Trouble-free Operation

Page 3
Precision, Fine Resolution & Unlimited Length of Travel

Page 4
Integral Pinion Transducers

Page 5
Backlash Elimination

Page 6
Angular Measuring Rack Concept

Page 7
Mounting Details for Angular Rack & Pinion

Page 8
Angular Measuring Rack on G. A. Gray (Gidding & Lewis) VTM Machine

 

   
 

 

 

 

 

 

 

 

 




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Page 5

The Fundamental Operation ...


Rack & Pinion Orientation
for Backlash Elimination

Flex_plate_assembly.gif (7258 bytes)


ribbon.gif (302 bytes)Backlash Elimination 

Our unique Flexplates eliminate all system backlash and pivot around the rack pitch line permitting as much as 0.015 inch variation between the fixed and moving members without affecting the measuring accuracy.  Repeatability is within 0.000025" over the total length of travel.

ribbon.gif (302 bytes)Neutral Axis Concept 

The Rack Channel has been designed such that neutral axes in bending intersect at the pitch line of the rack.  This theory has been proven in practice.  The calibrated accuracy of the rack assembly is not altered when it is mounted on a machine.  This can result in significant savings for machinery builders because mounting surfaces need not be perfectly flat (+/-0.040" for +/-0.0001" change in accuracy).  Our tests have shown that normal bolted joints between scales and mounting surfaces introduce distortion and result in measuring signigicant local errors - particularly in high resolution systems.

ribbon.gif (302 bytes)System Accuracy 

This is a non-contact system at the point of converting a mechanical motion into an electronic position signal.  In any non-contacting measuring system a precision air gap must be maintained between the moving member and the sensors.  Our air gap is within the rotating transducer and accurately maintained by high quality bearings.  It is easier to maintain closer tolerances with instrument size components with small ABEC 7 ball bearings than a large machine member with large bearings.

Total measuring accuracies within 0.0001 inch over most any length of travel are commonplace with either open rack or protected rack channel; and accuracies within 0.0005" are possible by use of laser calibration of special Grade 4 rack on a machine combined with Quality 15 pinion shaft encoders or resolvers.

ribbon.gif (302 bytes)Repeatability 

With Protected Rack Channel, 0.0001" bi-directional repeatability can be expected.


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5143 Electric Avenue
Hillside, IL 60162
708-449-5700 (Phone)
708-449-5703 (Fax)


E-Mail: schlenkent@aol.com

 

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