Linear encoders - Optical

A UniSlide with ACU-RITE digital readout system

A BiSlide with ACU-RIte encoder and DRO

The reader head is mounted to the slider, as shown, providing a true measurement of slider position. ACU-Rite data sheet.pdf  Encoder dimensions

Two resolutions available are

• 0.0002”/5 µm
• 0.00005”/1 µm
  

Scales can be provided from 2" to 90" long.

Linear encoders - Magnetic

Velmex can mount Elgo Electric EMIX 23 Magnetic incremental linear encoders on outside edge of BiSlide Carriages. Specs for encoder

DIGITAL READOUT OPTIONS DROs read the scales

Single axis Model QC-10V DRO (More details)
One, Two or Three Axis Model QC-100 Series DRO See also Metronic web site.
Alternatively, linear encoder output can also be transmitted to a PC directly using a PCI card like this one. It can read up to 4 encoders. We do not sell this. Purchase it here.

Rotary encoder

Encoders have quadrature output using 5 V logic and are stocked in the following resolutions: 100, 200, 250, 400, and 500 counts per revolution (CPR). See Encoder selection to view resolution with encoder.	When combined with a DRO readout, the encoder counts are converted to inches for the English thread or centimeters for the metric thread lead screws. For rotary tables, the encoder can be mounted on a motor shaft extension. It will read degrees on the DRO.
	Encoder mounted on the back end of a NEMA 34 motor double shaft motor

Potentiometer and gear train analog encoder

A small gear train and potentiometer may be attached to the lead screw. Application of a stable voltage source across the potentiometer provides a voltage output proportional to the slider position. This voltage may be applied as an input to an X-Y recorder, to an A/D converter for computer control, or to a comparator circuit for analog position control. In many cases, a direct resistance measurement as a position indicator is adequate. For most applications, a precision 10-turn potentiometer produces the required voltage signal. The gear train reduction ratio is selected to yield an output of close to, but less than, 10 revolutions. Accuracy is within 1% of travel.

Linear resistor strip analog encoder

Alternatively, for units up to 20" travel, a linear strip variable resistor can be installed paralleling the ways of the UniSlide Assembly. These resistor strips are available in lengths from 2" to 20" and are normally 1.5K ohms/inch. Accuracy is within 0.25%.