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High Resolution Position Readout
using Linear Encoders and Rotary Encoders
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. |
Typically, encoders are mounted
to regular Screw Drive type UniSlide stages. Call us for a
quote.
However, to save repositioning time,
mount encoders to Rapid Advance UniSlides. These stages, widely used in dendrochronolgy, have broad use in metrology. |
- 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 |
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Readout and Options
| Single axis Model ND1001
(More
details) |
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| One, Two
or Three Axis
Model QC-100 Series DRO
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| The USB to Serial
Adapter Cable connects the DRO to a computer USB port. This
adapter will automatically be configured as a virtual COM serial
port on a PC. This virtual COM port works exactly the same as
a standard COM port allowing all software to address the DRO
directly through a COM port number. Use this adapter with a
computer with an available USB port, but no RS-232 (COM) serial
port. Catalog number 4-2132. User Manual Data sheet |
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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. |
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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 
Example 1- Single
axis A60 UniSlide with ACU-RITE encoder and ND1001 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). |
Std. Resolutions: 0.001" or 0.01 mm
Data sheet
|
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Example
2 Rotary Encoder
-attach to lead screw, measure lead
screw rotation
-resolution: typically, 0.001" or 0.01 mm
See Encoder
Selection
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Example 3: Rotary
encoder attached to fine pitch lead screw shaft
Example 4:
A Three axis A40 model with encoder. Max resolution is 1 micron
Example 5 A60 Series Screw Drive
model with linear encoder attached.
Example 6 BiSlide with linear encoder
attached.
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