Linear rails need to be parallel within the allowable mounting error specified for the exact guide series, size, clearance or preload class, rail spacing, and machine accuracy requirement. There is no single universal parallelism tolerance for every linear guide system. In practical terms, the rails should be aligned closely enough that the carriages can travel through the full stroke without being forced to absorb excessive lateral or vertical misalignment.
Manufacturer data should control the final tolerance.
THK, for example, publishes model-specific allowable parallelism error values for two-rail installations, and those values vary by guide size and clearance class. THK also warns that mounting-surface error can affect guide service life.
The important rule is:
Do not use a generic “linear rails must be within X thousandths” rule. Use the allowable mounting error for the actual guide.
What Does Parallelism Mean for Linear Guide Rails?
When two linear rails are mounted side by side, parallelism describes how closely the two guide paths maintain the intended relationship over their complete length.
That relationship has more than one dimension.
Two rails can have:
lateral parallelism error
vertical height error
angular error
local straightness error
A pair of rails can appear parallel when viewed from above while still having a significant height difference.
Likewise, the rails can be the correct distance apart at one end but converge or diverge along the stroke.
For a two-rail guide system, alignment must be considered in three-dimensional space.
There Is No Universal Linear Rail Parallelism Tolerance
One of the most common questions is:
“How many thousandths out of parallel can linear rails be?”
The answer depends on the guide.
Allowable error can vary with:
manufacturer
guide family
nominal size
carriage type
radial clearance
preload
accuracy class
rail spacing
block spacing
mounting arrangement
machine rigidity
required machine accuracy
That is why a tolerance taken from one catalog should not automatically be applied to another guide family.
A Manufacturer Example Shows How Much Tolerances Can Vary
THK publishes approximate allowable parallelism error values for its SPR/SPS guide family under normal use.
For the examples in THK's table, allowable parallelism error increases with guide size and also changes depending on the clearance class.
Published approximate values include:
SPR/SPS15: 5 μm with C1 clearance and 3 μm with C0 clearance
SPR/SPS20: 6.5 μm with C1 and 4.5 μm with C0
SPR/SPS25: 8.5 μm with C1 and 7 μm with C0
SPR/SPS30: 10.5 μm with C1 and 9 μm with C0
SPR/SPS35: 13 μm with C1 and 10.5 μm with C0
SPR/SPS45: 17.5 μm with C1 and 14.5 μm with C0
These are model-specific examples, not universal linear-guide tolerances.
The same table also illustrates an important principle:
less internal clearance generally leaves less room for installation error.
What Does 10 Microns Actually Mean?
A micron is:
0.001 mm
Therefore:
10 μm = 0.010 mm
In inches:
0.010 mm ≈ 0.00039 in
That gives a sense of the scale involved.
Profile rail systems can operate at mounting tolerances far smaller than dimensions that might look insignificant during ordinary machine fabrication.
This is why visual alignment is not enough for a precision installation.
Why Parallelism Error Matters
When two rails are connected by a rigid table, the guide blocks on both rails are mechanically tied together.
If one rail tries to follow a different path from the other, the blocks and structure must accommodate that disagreement.
This can create:
additional lateral force
additional moment loading
increased rolling resistance
uneven load distribution
internal preload
binding
greater friction
increased wear
reduced service life
THK specifically states that mounting-surface error may affect LM Guide service life.
The rail system may still move, but that does not mean the alignment is correct.
Parallelism Error Creates a Closed Structural Loop
Consider a typical two-rail, four-block arrangement:
Rail 1 → Block 1 → Table → Block 2 → Rail 2 → Machine Base
Because the table and machine base connect the two rails structurally, geometric disagreement cannot simply disappear.
Something has to deform or carry additional load.
That “something” may be:
the carriage
the rail
the table
the machine base
the fasteners
This is why guide alignment is inseparable from machine rigidity.
The Master Rail Establishes the Reference
A reliable installation typically begins by accurately installing one rail as the:
master rail
or:
reference rail
The second rail is then aligned to it.
THK's installation guidance for parallel rail arrangements describes securing one rail first, placing a dial indicator on a block, and measuring the side and top faces of the second rail while adjusting its parallelism and level.
This is much more reliable than independently measuring both rails from unrelated machine edges.
How Parallelism Is Normally Checked
A common method is:
Install the master rail accurately.
Place a carriage on the master rail.
Mount a dial or test indicator from that carriage or moving table.
Contact the secondary rail with the indicator.
Move along the complete rail length.
Observe the change in indicator reading.
Adjust the secondary rail progressively.
Tighten the secondary rail.
Recheck after final torque.
This measures the second rail relative to the motion path established by the master rail.
Check the Side Face and the Top Face
THK's documented two-rail procedure specifically calls for checking both:
the side face
the top face
of the second rail.
That is important because two rails can be laterally parallel while still having a vertical mismatch.
A complete installation should therefore consider:
lateral parallelism
and:
vertical level
Horizontal Parallelism
Horizontal or lateral parallelism is the side-to-side relationship between the rails.
Imagine looking straight down at the machine.
If the rails converge or diverge, the carriages may be forced sideways as the table travels.
For example, the rail spacing might measure:
500.00 mm
at one end and:
500.10 mm
at the other.
That difference represents a change in rail relationship over the stroke.
Whether it is acceptable depends on the exact guide specification.
Vertical Level Between Rails
Now imagine looking at the machine from the end.
One rail may sit slightly higher than the other.
That creates vertical level error.
THK treats this separately from lateral parallelism and publishes model-specific allowable vertical-level error between rails. It notes that the allowable vertical error can depend on the center-to-center distance between the rails.
This means rail spacing can influence how mounting-height error is evaluated.
Why Rail Spacing Matters
Suppose two rails are:
200 mm apart
versus:
800 mm apart
The same vertical height difference creates a different angular relationship between the carriage mounting planes.
That is why some manufacturer guidance expresses allowable vertical error relative to the distance between rail axes.
The relationship is not simply:
“both rails must be within X mm in height.”
The complete geometry matters.
Straightness and Parallelism Are Different
A rail can be very straight but not parallel to the other rail.
Likewise, two rails can remain approximately the same distance apart while both follow an undesirable curve.
Straightness describes an individual guide path.
Parallelism describes the relationship between two guide paths.
A precision machine may need both controlled.
Running Parallelism Is Different Again
Manufacturers also use the term:
running parallelism
THK defines running parallelism as the tolerance between the LM block and the rail reference surface as the block travels the full rail length with the rail mounted to its reference surface.
That is a product accuracy characteristic.
It should not be confused with:
installation parallelism between two separate rails
Both matter, but they describe different things.
Accuracy Grade Does Not Automatically Define Installation Error
A high-accuracy rail may have tighter dimensional and running-parallelism specifications.
But that does not mean the machine automatically achieves that accuracy once the rail is bolted down.
Installed system accuracy also depends on:
base machining
rail alignment
mounting torque
carriage matching
table geometry
structural stiffness
thermal conditions
drive-system alignment
A precision rail mounted poorly can produce a poor machine.
Clearance and Preload Affect Misalignment Sensitivity
Guide blocks can be supplied with different internal clearance or preload conditions.
THK's SPR/SPS parallelism table illustrates how allowable installation error changes between C1 and C0 clearance classes.
The broader engineering concept is that a system with less internal freedom generally has less ability to accommodate geometric error.
However, do not assume a universal relationship or calculate an allowable tolerance from preload alone.
Use the exact manufacturer's table.
Can Self-Alignment Compensate for Error?
Profile rail guides can accommodate some small installation error.
THK notes that LM Guides have a self-aligning capability that can allow smooth straight motion despite slight mounting-surface distortion or error.
But this should not be interpreted as permission for careless mounting.
The same THK document immediately notes that mounting-surface error can affect service life and directs users to model-specific allowable values.
The practical lesson is:
self-alignment is a tolerance capability, not a substitute for alignment.
Do the Rails Need to Be Perfectly Parallel?
No manufactured system is perfectly parallel in the mathematical sense.
The goal is to keep error within the specified allowable tolerance.
The more demanding the machine, the more important it becomes to control:
rail parallelism
height difference
straightness
mounting-surface geometry
table geometry
The relevant question is therefore not:
“Are the rails perfectly parallel?”
It is:
“Is the measured installation error within the allowable value for this guide and machine?”
How to Measure Parallelism With a Dial Indicator
A practical procedure is:
Step 1: Install the Master Rail
Secure the reference rail using the machine datum and manufacturer installation procedure.
Step 2: Place a Carriage on the Master Rail
The carriage establishes a moving reference along the master guide path.
Step 3: Mount the Indicator
Attach a dial or test indicator to:
the master carriage
the moving table
a temporary alignment plate
Step 4: Contact the Secondary Rail
Place the indicator tip against the appropriate side reference surface of the second rail.
Step 5: Move Through the Stroke
Move slowly from one end to the other.
Step 6: Record the Variation
The changing indicator reading shows relative lateral displacement between the guide paths.
Step 7: Adjust the Secondary Rail
Move the rail as needed while its bolts remain temporarily tightened.
Step 8: Tighten Progressively
Secure the rail while maintaining the desired alignment.
Step 9: Recheck
Measure again after final torque.
Measure Vertical Level Too
After checking the rail side face, move the indicator to the top reference surface if the installation procedure permits.
Sweep the rail again.
This identifies changes in vertical relationship.
THK's parallel-rail installation procedure explicitly describes checking both surfaces so parallelism and level can be adjusted together.
Measure Across the Full Working Stroke
Do not measure only at:
the two ends
the center
one convenient location
A rail may contain a local deviation that is missed by sparse measurements.
Check the complete usable path.
For a long rail, record indicator readings at multiple positions.
For example:0 mm
250 mm
500 mm
750 mm
1,000 mm
This can help reveal:gradual convergence
gradual divergence
local bends
mounting-surface irregularities
Example: Interpreting an Indicator Sweep
Suppose the secondary rail produces these lateral readings relative to the master:
beginning: 0.000 mm
250 mm: +0.003 mm
500 mm: +0.005 mm
750 mm: +0.007 mm
1,000 mm: +0.009 mm
The total measured variation is:
0.009 mm
or:
9 μm
Whether that is acceptable cannot be determined from the number alone.
For one guide it may fall within the published allowance.
For another guide, clearance class, or precision requirement, it may not.
The next step is:
compare the measured value with the manufacturer's allowable parallelism error for the exact guide.
Why “A Few Thousandths” Can Be Misleading
Machine shops commonly speak in thousandths of an inch.
But:
0.001 in ≈ 0.0254 mm = 25.4 μm
That can already exceed the allowable parallelism error for some profile rail systems.
For comparison, THK's published SPR/SPS examples range from only 3 μm to 17.5 μm depending on guide size and clearance.
So a statement such as:
“It's only a thousandth out”
does not automatically mean the installation is acceptable.
What Happens When the Rails Are Too Far Out of Parallel?
Possible symptoms include:
changing hand force through the stroke
table binding
noisy motion
increased motor current
inconsistent positioning
uneven carriage temperature
premature raceway wear
abnormal seal drag
reduced bearing life
The exact symptom depends on the amount and direction of error, guide preload, machine rigidity, and load.
Binding Is an Important Warning Sign
If the table becomes significantly harder to move at one location, stop and investigate.
Possible causes include:
rails converging
rails diverging
vertical height error
rail straightness error
debris beneath a rail
table distortion
damaged block
damaged rail
incorrectly tightened fasteners
Do not assume additional lubrication will correct a geometric problem.
Motor Current Can Reveal Alignment Problems
On a powered axis, excessive or changing drive current can sometimes indicate increased mechanical resistance.
If motor current rises as the axis approaches one end of travel, possible causes include:
rail misalignment
screw misalignment
cable drag
seal resistance
mechanical interference
It is diagnostic information, not proof that the rails are the cause.
The guideway should still be measured directly.
Do Not Use the Table to Force Badly Misaligned Rails Together
A rigid table can make an incorrectly aligned system appear assembled.
The table bolts may pull the carriages into position, but that does not remove the underlying error.
Instead, it can generate internal stress.
The better approach is:
establish the master rail
align the secondary rail
verify both guide paths
then secure the table
The blocks should not be used as clamps to correct major rail-position errors.
How Rail Spacing Changes Structural Sensitivity
Wider rail spacing is often beneficial for resisting roll moments because it increases the support footprint.
But wider spacing also means the machine base and moving table must maintain the required relationship over a larger transverse distance.
Rail spacing therefore interacts with:
mounting height variation
table flatness
base flatness
angular error
The complete machine structure matters.
How Block Spacing Affects the System
Block spacing is longitudinal spacing between carriages.
It affects pitch and yaw moment reactions and the rigidity of the moving structure.
It does not directly specify the allowable rail parallelism tolerance.
However, block spacing affects how a rigid table connects the guideways and can influence the system's response to geometric error.
Again, the proper mounting allowance should come from manufacturer data rather than a simplified geometric rule.
Precision Machines Need More Than “No Binding”
For a basic handling application, smooth travel may be a major practical check.
For:
machine tools
metrology equipment
semiconductor equipment
precision assembly
inspection systems
high-accuracy automation
the installation should also be verified against specified geometric tolerances.
Smooth movement does not prove:straightness
positioning accuracy
squareness
running parallelism
repeatability
Machine Accuracy Can Require Tighter Alignment Than the Guide Allows
Manufacturer error allowances typically describe what the guide can accommodate under specified conditions.
Your machine may require better alignment.
For example, if the guide can tolerate a certain amount of mounting error but the machine needs extremely tight path accuracy, the machine design may impose a much smaller allowable alignment error.
Therefore:
manufacturer allowable error is not automatically the target installation tolerance.
For precision work, aim for the machine requirement when it is tighter.
Mounting Surface Accuracy Is Fundamental
Schaeffler's precision rail guide documentation makes the broader point that running accuracy depends strongly on the straightness, accuracy, and rigidity of the fitting and mounting surfaces. It recommends carefully finished supporting surfaces and properly deburred mounting holes.
Although that document addresses precision rail guides rather than every profile rail family, the engineering principle is highly relevant:
guide performance starts with the adjacent machine structure.
Do Not Copy Precision-Rail Tolerances Into Profile-Rail Applications
Schaeffler's precision rail documentation contains specific numerical requirements for its precision guide arrangements. Those values should not automatically be transferred to unrelated recirculating profile rail systems.
Likewise, the THK SPR/SPS values cited above should not be applied to HSR, SHS, SBC, WON, Schaeffler, or another family without verifying the corresponding manufacturer's data.
This is one of the most important rules when discussing linear-guide alignment:
manufacturer-specific numbers stay manufacturer-specific.
What If the Manufacturer Gives an Allowable Mounting Error?
Use it as the upper installation limit under the conditions stated in that documentation.
But when possible, do not intentionally align the rails right at the maximum.
A more centered alignment provides margin for:
measurement uncertainty
torque-induced movement
thermal expansion
structural deflection
manufacturing variation
The maximum allowable value should generally be treated as a boundary, not a design target.
What If No Parallelism Value Is Easy to Find?
If the exact product documentation does not clearly provide a value:
confirm the exact manufacturer
confirm the series
confirm the rail size
confirm the carriage
confirm preload or clearance
contact the manufacturer or supplier
Do not substitute a value from a vaguely similar rail.
That is particularly important when the machine is:
heavily loaded
highly preloaded
high precision
high speed
long stroke
Parallelism for Replacement Rails
When replacing a guide system, do not assume the existing mounting surfaces are still correct.
Possible issues include:
crash damage
corrosion
fretting
loose fasteners
worn shoulders
previous repair work
distorted machine structure
Before installing the new rail:
clean the base
inspect the reference surfaces
verify the master rail datum
check rail spacing
align the new secondary rail
A new guide installed onto damaged geometry may quickly reproduce the original problem.
Parallelism for Long-Stroke Systems
Long axes deserve special attention.
A small angular error can become a larger lateral displacement over a long distance.
For example, if one rail slowly diverges from the other, the carriage system may see progressively increasing side load as travel increases.
Long guideways should therefore be measured at multiple positions over the complete stroke.
If the rails are jointed, also inspect the joints for:
lateral step
vertical step
orientation
match marks
THK notes that jointed parallel rails may be manufactured for axisymmetric alignment and that joint match marks should be maintained during assembly.
Thermal Effects Can Change Alignment
Large machines can change geometry as temperature changes.
Potential sources include:
motors
gearboxes
ball screws
process heat
sunlight
unequal machine-base heating
ambient temperature swings
If one side of a wide machine warms more than the other, rail alignment can change.
For thermally sensitive machinery, alignment should be considered as part of the complete thermal design rather than only as a room-temperature assembly measurement.
Should Rails Be Aligned Before Installing the Ball Screw?
In many machine builds, it is helpful to establish the guideway geometry independently before allowing the drive system to influence it.
The ball screw, actuator, or belt should not be used to force a misaligned table through its travel.
Once the guideway is aligned, the drive system can then be aligned to the established motion path.
The exact assembly sequence depends on the machine architecture.
A Practical Two-Rail Parallelism Procedure
Step 1: Identify the Exact Guide
Record:
manufacturer
series
size
carriage type
clearance/preload class
accuracy class
Step 2: Obtain the Manufacturer's Mounting Limits
Find:
allowable rail parallelism error
allowable vertical-level error
mounting-surface requirements
Step 3: Prepare the Machine Base
Remove:
burrs
chips
raised material
contamination
Step 4: Install the Master Rail
Seat and secure it according to the manufacturer's mounting procedure.
Step 5: Verify the Master Rail
Check:
straightness
datum contact
height
Step 6: Position the Secondary Rail
Leave it temporarily fastened.
Step 7: Measure Lateral Parallelism
Use an indicator referenced from the master rail or moving table.
Step 8: Measure Vertical Level
Check the secondary rail's top reference surface where applicable.
Step 9: Adjust Progressively
Correct the secondary rail as measurements are taken along the full length.
Step 10: Tighten the Rail
Use the specified bolt torque and tightening sequence.
Step 11: Recheck After Final Torque
Verify that the rail did not shift.
Step 12: Check Full-Stroke Travel
Confirm consistent motion from end to end.
Step 13: Verify the Machine Requirement
Ensure the final alignment satisfies both:
guide manufacturer's allowance
machine's required geometry
Common Linear Rail Parallelism Mistakes
Using a Universal Tolerance
There is no single allowable error for all linear guides.
Checking Only One End
Rails can converge, diverge, or curve along the stroke.
Checking Only Rail Spacing
Correct spacing at one point does not prove parallelism.
Ignoring Height Difference
Vertical misalignment can load the guide system even when lateral alignment is good.
Assuming Smooth Motion Means Correct Alignment
Smooth movement is useful feedback but not a precision measurement.
Forcing the Rails Together With the Table
This can hide error by loading the carriages.
Using Another Manufacturer's Tolerance
Allowable error is model-specific.
Treating Maximum Allowable Error as the Alignment Goal
Better alignment provides useful margin.
Ignoring Machine Accuracy Requirements
The machine may need tighter geometry than the guide's maximum allowable mounting error.
Linear Automation USA's Perspective
At Linear Automation USA, we do not recommend answering the question:
“How parallel should my rails be?”
with a generic number.
The better question is:
“What parallelism error is permitted for this exact guide, and what does the machine itself require?”
For a two-rail installation, we recommend identifying:
manufacturer
guide family
nominal size
carriage style
clearance or preload class
accuracy class
rail spacing
rail length
block spacing
mounting orientation
machine accuracy requirement
Then establish one rail as the reference and measure the second rail relative to it.
Our rule is:
Use the manufacturer's allowable error as a limit, not an excuse for loose alignment. Align the rails as accurately as the machine and measurement method reasonably permit.
Linear Automation USA supplies industrial profile rail systems from SBC Linear, WON Linear, Schaeffler, and other supported product families.
For help selecting or troubleshooting a two-rail guide system, contact Linear Automation USA.
Linear Rail Parallelism Checklist
Before alignment:
Identify manufacturer.
Identify guide series.
Confirm nominal size.
Confirm carriage model.
Confirm clearance or preload.
Confirm accuracy class.
Obtain manufacturer allowable parallelism error.
Obtain allowable vertical-level error.
Inspect the machine base.
Verify rail spacing.
During alignment:Establish the master rail.
Verify master-rail straightness.
Temporarily position the secondary rail.
Measure lateral parallelism.
Measure vertical level.
Check multiple positions.
Adjust progressively.
Tighten using the correct torque.
Recheck after final torque.
After alignment:Install or finalize the table.
Check complete-stroke motion.
Investigate tight spots.
Verify machine-level geometric requirements.
Document final readings for precision equipment.
Frequently Asked Questions
How Parallel Do Linear Rails Need to Be?
They need to remain within the allowable parallelism error for the exact guide series, size, clearance or preload class, and machine requirements. There is no universal value.
Is 0.001 Inch Parallel Enough for Linear Rails?
Not necessarily. One thousandth of an inch is approximately 25.4 μm, which exceeds the allowable parallelism error published for some profile rail systems.
What Is a Typical Linear Rail Parallelism Tolerance?
There is no reliable universal typical value. THK's SPR/SPS examples range from approximately 3 μm to 17.5 μm depending on guide size and clearance class, but those values apply specifically to that family.
Does Preload Affect Allowable Misalignment?
It can. Manufacturer tables may specify different mounting-error allowances for different clearance conditions. Verify the exact guide's documentation.
Should I Check Vertical Alignment Too?
Yes. Two rails can be laterally parallel while still being vertically misaligned.
How Do I Measure Rail Parallelism?
Install one rail as the master and use a dial indicator referenced from the master carriage or table to sweep the second rail through the complete stroke.
Can Linear Guide Blocks Compensate for Misalignment?
They may accommodate some small error, but manufacturer allowable limits still apply, and excessive mounting error can affect service life.
Can I Align Rails by Measuring the Distance Between Them?
Rail-spacing measurements can help, but they do not provide a complete alignment check. An indicator referenced to the master guide path provides more useful information.
Do High-Precision Rails Need Better Alignment?
Precision applications generally demand careful mounting geometry, and the machine itself may require alignment tighter than the guide's maximum allowable mounting error.
Does a Longer Rail Need a Tighter Parallelism Number?
Not automatically. Use the manufacturer's specification. However, long rails should be checked carefully because small angular errors can produce larger positional deviations over distance.
What Happens if the Rails Are Too Far Out of Parallel?
The system can experience additional carriage loading, increased resistance, binding, wear, noise, and potentially reduced service life.
Should I Align to the Maximum Allowable Error?
Preferably not. The published allowable error should generally be considered a boundary. Better alignment provides margin for measurement uncertainty, assembly changes, and operating conditions.
Need Help Determining the Correct Parallelism for Your Linear Guides?
Provide:
manufacturer
rail series
nominal size
carriage model
preload or clearance class
accuracy class
rail length
rail spacing
block spacing
mounting orientation
application accuracy requirement
For an existing machine, measurements or photographs of:rails
carriages
mounting shoulders
machine base
can also help identify the system.
Review additional technical information on the Linear Automation USA Resources page or contact Linear Automation USA for application assistance.
Recommended Reading
How to Align Two Linear Guide Rails
Learn how to establish a master rail and align the secondary rail using a dial indicator, straightedge, moving table, or alignment jig.
How to Install Linear Guide Rails Correctly
Learn how machine-base preparation, reference surfaces, tightening sequence, rail alignment, and final inspection influence guide performance.
How Machine Rigidity Affects Linear Guide Performance
Learn how machine-base stiffness, table rigidity, rail spacing, block spacing, and structural deformation influence the installed guide system.
How Far Apart Should Linear Guide Rails Be?
Learn how transverse rail spacing affects moment reactions, structural rigidity, machine footprint, and guide-system behavior.
How Far Apart Should Linear Guide Blocks Be?
Learn how block spacing affects pitch and yaw moment reactions, load distribution, and structural rigidity.
Linear Guide Accuracy Classes Explained
Learn what linear-guide accuracy grades describe and why guide accuracy is only one part of total machine accuracy.
Sources & Technical References
THK — Dimensional Tolerance of the Mounting Surface for SPR/SPS
THK publishes model-specific approximate allowable parallelism errors between two rails for the SPR/SPS guide family and shows how the permissible value changes with guide size and clearance class.
THK — LM Guide Mounting Surface Tolerances
THK explains that slight mounting error may be accommodated by the guide's self-aligning capability but also warns that mounting-surface error can affect service life. The document separately addresses parallelism error and vertical-level error between two rails.
THK — Mounting Procedure
THK describes securing one rail first and using a dial indicator against the side and top faces of the second rail to simultaneously adjust parallelism and level during installation.
THK — Determining the Accuracy
THK distinguishes running parallelism from mounting parallelism and explains how LM Guide accuracy is defined through running parallelism and dimensional tolerances when multiple blocks or rails are used together.
THK — Marking on the Master LM Guide and Combined Use
THK documents matched rails, master-rail identification, and special considerations for jointed rails used in parallel guide arrangements.
Schaeffler — Precision Rail Guides
Schaeffler explains that running accuracy depends strongly on the straightness, accuracy, and rigidity of mounting surfaces and emphasizes careful preparation of supporting surfaces. Numerical limits in this precision-rail publication should be applied only to the guide systems for which they are specified.
Linear Automation USA — Resources
Linear Automation USA provides engineering resources for profile rail selection, cut-to-length rail planning, and industrial linear-motion applications.
Linear Automation USA
Linear Automation USA supplies industrial profile rail systems, carriages, custom-cut rail, and replacement support for linear-motion applications.