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Design Advantages of Linear UniSlide Assemblies
- Compact design yields long travel in
a short work space
- A simple, reliable design easily adaptable
- Modular components facilitate multiple
- A broad variety of lengths, sizes and
- Customizing to accommodate special circumstances
- View examples
of the slide selected for a given application will depend on user
requirements. The chart below provides maximum dynamic load capacities
for each model for three different load positions.
Load Capacities of Manual UniSlides
lb or 6.8kg
lb-in or 23 kg-cm
lb or 4.5 kg
lb or 13.6 kg
lb-in or 46 kg-cm
lb or 4.5* kg
lb or 45.5 kg
lb-in or 150 kg-cm
lb or 22.7 kg
lb or 109 kg
lb-in or 369 kg-cm
lb or 45 kg
lb or 182 kg
lb-in or 550 kg-cm
lb or 45 kg
*A25 Series with W1 or P10 lead screws: LT = 30
lbs./13.5 kg. Static loads are twice the dynamic load values given
Up, Down, Left and Right
The reference position for linear UniSlide Assemblies is with the
base down, the slider up, and the knob, if any, facing the user.
UniSlides begin as an extrusion of
aluminum alloy with a straightness tolerance of half the normal
commercial tolerance. Subsequent machining and lapping operations
produce a very high degree of straightness and parallelism in the
B-Type Base For increased base stiffness, several of our A-series
bases - A25, A40 and A60 - are also available in the deeper B-series
style . This extra stiffness is particularly useful when the full
length of the base cannot be adequately supported. Typical stiffness
of the B-series base is two to four times greater than the A-series.
There are three types of deviations from
straightness than can occur: X, Y and Z. Picture a UniSlide resting
base down on a flat surface, with its linear motion in the X or
longitudinal direction. A departure from straightness in the upward
direction-the Z axis-is designated as the bow error. A deviation
in the horizontal direction-the Y axis-is horizontal run out, often
referred to simply as run out. And a twist in the direction of the
slide-the X axis-is called twist. The upper limits for these deviations
from straightness, as determined by our manufacturing processes,
- Bow* 0.002" per foot
- Run Out 0.001" per foot
- Twist 1 milliradian per foot
* As installed, bow can be affected by the degree
of flatness of the supporting surface and the relative tension of
the mounting screws. Top
Reduced Straightness Tolerances
your application requires lower straightness tolerances, we can
supply UniSlides with straightness tolerances approximately one-half
of the nominal values given previously. We individually select, measure
and certify UniSlide Assemblies.
The temperature range for standard linear stages is -18ºC(0ºF) to 83ºC (180ºF). Some stages, with proper material substitutions, can operate outside of that range. Please call to discuss your application.
In hot and cold environments, it's important that major stage components be metal to avoid problems resulting from widely different coefficients of expansion. In other words, those components that are plastic such as the drive nut and, in smaller UniSlides, the thrust bearings, need to be replaced with brass.
For hot and cold temperatures, brass drive nuts work best. They are also recommended for frequent cycling between extreme temperature such as in environmental test chambers.
The standard aluminum alloy dovetail base
and low friction polymer pads of the slider provide excellent performance
as a bearing material combination. Unlike ball screw slide mechanisms,
no lubrication is required. Under light to moderate loads, sideways
play caused by wear during the first 30,000 cycles of operation
will be approximately 0.00015 inches. Wear after that is reduced,
to approximately 0.00005 inches over the next 50,000 cycles. Sliders
are equipped with adjustment screws to compensate for wear, if necessary.
For harsh environments and/or a higher number of cycles, UniSlide
Assemblies with hard coat anodized ways are available. For clean
room environments we recommend electroless nickel plating.
Photo 2 Aluminum lead screws
We can make linear positioners with
very low or no magnetic permeability (euphemistically called nonmagnetic). UniSlide base and slider
assemblies are made from aluminum alloy. Standard lead screws are
either 303 stainless steel or cold rolled steel with electroless nickel plating (the W1, W2 and P10, P5 lead screws).
We can also supply lead screws of 6061 aluminum as shown in photo 2.
Thrust bearing using polymer raceways and cages with
either glass or 316 SS balls are available. We can supply BiSlide Assemblies with 316 stainless lead screw in 0.100" pitch. In a few models
with small steel parts, a no nonmagnetic replacement is available.
For further information please contact the factory. Top
Base and Slider Lengths
Standard and maximum base lengths for all
models are listed in the specifications for each model. Custom base
lengths are available on special order. Slider lengths available
are only those listed in the model specifications.
More on vacuum applications.
Back driving the lead screw
UniSlides with W2, W4 or P5 lead screws can
back drive under certain conditions.
See Lead Screws
for additional details.
Scale and Control Lever
The control lever for Rapid
Advance units is on the right
hand side. Printed and engraved scales are on the left
side as shown in the drawings and photos in this catalog. Scale
numbering always progresses toward the knob end of the unit-i.e.,
the largest numbers on the scale are closest to the knob. Control
levers, top plates, thumbscrew locks and verniers can be mounted
on the alternate side on special request. If requested, the scale
can be mounted on the right side of the UniSlide, with zero at the
knob end of the base. For models with the base mounting holes located
off the center line, holes begin at the bearing block end with the
first hole to the right of the lead screw. See Dimensional Drawing
for Series of choice, Top of page.
Material substitutions for drive
nuts and thrust bearing are possible. Drive nuts are
available in brass, oil-impregnated bronze, and, for high temperature
or radiation applications, in Vespel. Bearings can be manufactured
||Photo 3:Brass Drive Nut are often used in high and low temp environments