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  HOME > MANUAL PRODUCTS HOME > ENCODERS & DROs 1 (800) 642-6446 or 1 (585) 657-6151 (in NYS)
linear stage with position encoder
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  Measured travel overview
  With Rapid Advance

High Resolution Position Readout
using Linear Encoders and Rotary Encoders

XY table with linear encoder

Mounting an encoder directly to the slider gives a direct reading of slider movement eliminating lead screw and backlash errors.

For high resolution (>0.001") position readout, we can mount ACU-RITE ENC glass scale encoders to most linear UniSlide or BiSlide Assemblies. Details.

Typically, encoders are mounted to regular Screw Drive type UniSlide stages. Call us for a quote.

However, to save repositioning time, they can also be used with Rapid Advance UniSlides as shown on this page.

- If this is overkill, see Measured Travel for other ways to measure travel.
- If your goal is to send positron data to a computer, it is sometimes less expensive to use a step motor system without encoders. Call us.
- Motor Driven stage with Linear Encoders

ACU-Rite Specifications  ACU-Rite data sheet.pdf
Resolution: choose one of 2 resolution encoders
  • 0.0002”/5 µm
  • 0.00005”/1 µm
    Repeatability: Within one resolution count
    Scale Medium: Chrome-coated glass
    Output: Two line TTL quadrature signal
    Cable Length: 10 ft.

    • Linear encoders - Magnetic

    Velmex can mount Elgo Electric EMIX 23 Magnetic incremental linear encoders on outside edge of BiSlide or UniSlide stages.

    Specs for encoder

    		 magnetic encoder

    Readout Options 

    Single axis Model QC-10V DRO (More details) velmex QC-10V

    One, Two or Three Axis
    Model QC-100 Series DRO

    See also Metronic web site.

    		QC-100 DRO

    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.

    		 Quad 04


    Compatibility Specifications

    Series
    Reader Plate thickness
    Slider length
    Longest possible travel distance
    B25
    5/8"
    4"
    32" *
    A or B40
    7/8"
    6"
    42" *
    A or B60
    7/8"
    6"
    48" *
    B90
    7/8"
    9"
    60" *
    BiSlide
    not required
    Std.
    80"
    *For longer travel, BiSlide Assemblies are more cost effective. Spec BiSlide

    linear stage with linear encoder

    Example 1- Single axis A60 UniSlide with ACU-RITE encoder and QC10V Digital Readout. This system can have a travel of up to 60" long. The readout has a RS232C serial output.

    Rotary Encoders

    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.

    Contact Velmex sales for quote.

     
    Rotary Encoder

    Example 2 Rotary Encoder

    -attach to lead screw, measure lead screw rotation
    -resolution: typically, 0.001" or 0.01 mm
      See     Encoder Selection

     

    rotary encoder and DRO
    Example 3: Rotary encoder attached to fine pitch lead screw shaft

    XYZ stages with encoders
    Example 4: A Three axis A40 model with encoder. Max resolution is 1 micron

    close up of linear encoder
    Example 5     A60 Series Screw Drive model with linear encoder attached.

    close up of linear encoder
    Example 6     BiSlide with linear encoder attached.

    		 
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