      |
|||
  |
 |
||
|
|||
| + 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 |
|||
| |
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 Page 5 Page 6 Page 7 Page 8
|
||
|
|
|||
. . . .
|
|
||||
The Fundamental Operation ... |
|||||
Rack & Pinion Orientation |
|||||
|
|||||
 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.
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.
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.
|
|||||
| <<<Back | Page 5 |
||||
|
|||||
[Rack_and_Pinion_Measuring] [Precision_Rules] [DROs] [AC_Servo_Motors] [Instrument_Gears] [Clutches,_Brakes] [Torque_Transducers] [Products] [Contact_Us-Send_Brochure] [Home] |
|||||
| Best
viewed in Microsoft Internet Explorer or Netscape Communicator. Copyright ?1998 Schlenker Enterprises Ltd. |
|||||
