The side roll height shim is a precision spacer component used to adjust and calibrate the vertical position of side rolls in a roll forming machine.
While the adjustment screw controls lateral movement, the height shim controls vertical alignment, ensuring that:
The side roll contacts the strip at the correct elevation
Edge forming pressure is evenly distributed
Flange height remains consistent
Profile twist is minimized
Tool geometry remains aligned with pass design
Even small variations in vertical alignment can impact edge quality, particularly in tight-tolerance or high-strength steel applications.
A side roll height shim is a thin, precision-manufactured metal plate installed between:
The side roll mount block and bracket
The mount block and slide plate
The bracket and machine frame
It alters the vertical position of the side roll assembly by a controlled thickness increment.
Adjusts the side roll centerline relative to the strip.
Controls final flange height consistency.
Ensures correct alignment with preceding and following forming passes.
Corrects minor setup deviations without full mechanical repositioning.
Side roll height shims are typically placed:
Under the mount block
Between mounting bracket and support plate
Between adjustment assembly components
On cassette-style side roll systems
They are stacked or replaced to achieve exact height.
Common shim thicknesses:
0.01 mm
0.02 mm
0.05 mm
0.10 mm
0.25 mm
0.50 mm
1.00 mm
Precision ground shims allow micron-level adjustment.
Side roll height shims are typically made from:
Hardened spring steel
Stainless steel
Precision ground alloy steel
Brass (less common for structural loads)
Material selection ensures:
Flatness
Load stability
Corrosion resistance
Although thin, shims must withstand:
Compression load
Lateral forming pressure transfer
Vibration
Clamp torque force
High-quality shims prevent deformation under load.
Proper shims have:
Ground parallel faces
Burr-free edges
Consistent thickness
Smooth surface finish
Irregular surfaces can introduce misalignment.
Incorrect vertical alignment may cause:
Uneven flange formation
Edge roll marking
Profile asymmetry
Twist or camber
Shims allow correction without redesigning tooling.
Height shims are often adjusted:
During initial machine installation
After tooling change
When switching material thickness
During tolerance correction
They provide repeatable setup accuracy.
Shims may be:
Used individually
Stacked in combination
Replaced with custom thickness plates
Stacking must maintain flat contact surfaces.
The shim directly affects:
Side roll vertical centerline
Bearing alignment
Contact angle with strip edge
Precision here protects tool life.
When forming high-strength materials:
Lateral forces increase
Compression on shim increases
Material hardness must resist creep
Hardened steel shims are recommended.
Low-quality shims may:
Compress over time
Develop indentation
Lose height consistency
Precision-ground shims resist long-term deformation.
Shims may be:
Stainless steel
Zinc plated
Oiled for protection
Corrosion changes thickness tolerance.
Proper installation requires:
Clean contact surfaces
Even bolt torque
No burrs or debris
Proper stacking alignment
Uneven stacking creates tilt.
| Height Shim | Adjustment Screw |
|---|---|
| Controls vertical position | Controls lateral position |
| Static once installed | Adjustable during setup |
| Precision thickness-based | Thread pitch based |
Both systems work together for full roll positioning.
Correct shim selection ensures:
Uniform flange height
Consistent web geometry
Reduced scrap
Stable production repeatability
Precision vertical control supports high-spec profiles.
Routine checks should verify:
No shim deformation
No corrosion buildup
No stacking misalignment
No surface galling
Shims must remain flat and intact.
Height shims offer:
Simple mechanical solution
No moving parts
Long service life
Micron-level correction
Reliable repeatability
They are one of the most stable adjustment methods.
The side roll height shim is a precision spacer used to control the vertical alignment of side rolls in a roll forming machine.
It:
Adjusts roll centerline height
Maintains flange accuracy
Supports pass alignment
Resists compression and vibration
Ensures repeatable setup precision
Though thin and simple, it is critical for dimensional accuracy in high-performance roll forming systems.
A precision spacer used to adjust the vertical position of a side roll assembly.
It ensures correct flange height and profile alignment.
Typically hardened steel or stainless steel.
Yes, but surfaces must remain flat and aligned.
Yes, vertical misalignment directly impacts flange geometry.
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