(3) Precision, Fine Resolution & Unlimited Length of Travel



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

	Operates in Shock and Vibration Conditions The Linear Encoder or Resolver Package is designed to operate in shock conditions. Specifications far exceed those of glass or magnetic scales. If fact, a glass scale will likely break under conditions approaching the upper limits of a rack and pinion specification. Precise Operation Accuracy on a machine tool is dependent on the readout system’s ability to measure the actual position of the tool relative to the work piece. It is critical that the feedback device adapt to temperature changes without creating errors. There are two main reasons why a rack and pinion feedback measuring system creates fewer temperature related errors: The thermal coefficient of expansion is identical to that of machinery steel. The rack is attached directly to the machine via the channel. The rack will only change with the machine, not the air around the machine. Being suspended in air, glass and magnetic scales are affected by air temperature not machine temperature. Fine Resolution A resolution of 50 millionths of an inch (.000050") provides fine resolution for grinding applications and .0001 inch diameter increments for lathes, milling machines or any other machines. Unlimited Length of Travel Due to the unique construction of the SEL Series Rack and Pinion Encoder or Resolver Measuring System Package, there is really no limitation to the length of travel. The SEL Series is accurate to +/- .0005 inches regardless of length. There is no cumulated error.

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