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Metal Shims: Types, Applications and Advantages
Looking to find and compare metal shim suppliers? See our Metal Stamping Companies directory to request free quotes. This guide focuses on technical manufacturing, precision tolerances, shim configurations, and alloy selection.
Introduction
This article provides an in-depth discussion on precision metal shims and alignment stock:
- What are metal shims?
- How are metal shims made? (Stamping, Laser, Waterjet, EDM)
- Types of metals used and specific alloy benefits
- Industrial and domestic applications of shims
- Key selection considerations
Chapter One: Understanding Metal Shims
Definition of a Shim: A shim is a versatile spacing material used to bridge gaps, fill spaces, and make precise adjustments in construction, machining, and mechanical assembly applications. Whether used to create sturdy window and door jambs, correct alignment during installation, or precisely level machinery, shims range from simple leveling blocks to high-precision metallic shim stock engineered for extreme environments.
Shims reduce vibration, compensate for manufacturing tolerances, and absorb operational wear between mating components, preserving expensive machinery assemblies.
Chapter Two: How are Metal Shims Made?
Shim manufacturing utilizes various cutting, pressing, and machining techniques tailored to metal hardness, stock thickness, and required tolerances.
Comparison of Metal Shim Manufacturing Methods
| Process | Thermal Distortion | Tooling Expense | Tolerance Precision | Best For |
|---|---|---|---|---|
| Stamping / Pressing | None (Cold mechanical shear) | Moderate (Steel rule dies) | High | High-volume standard thin foil and sheet shims |
| CNC Laser Cutting | Low (Localized heat zone) | None (Direct vector) | Extremely High | Prototyping, custom shapes, complex profiles without dies |
| Water Jet Cutting | Zero (Cold abrasive process) | None | Very High | Thick stock, heat-sensitive alloys, composite shims |
| EDM Wire Cutting | Minimal (Spark erosion) | None | Ultra-Precision (Micron scale) | Hardened tool steel shims, ultra-thin high-spec dies |
| CNC Turning | None | Low | High | Cylindrical, round ring shims, and heavy thrust washers |
Stamping/Pressing
Utilizes steel rule dies or hard tooling on press machines for fast, repeatable output on thin stock.
CNC Laser & Water Jet Cutting
Laser cutting offers tool-free flexibility for complex geometries, while water jet cutting processes heat-sensitive materials cleanly without thermal distortion.
EDM Wire Cutting, Turning, and Punching
Wire EDM handles hardened or delicate metallic foils with sub-micron accuracy, while turning creates round shim rings and arbor spacers.
Chapter Three: Leading Metal Shim Manufacturing Machinery
Top machinery across North America includes:
- Trumpf TruLaser Series: High-precision fiber laser cutting systems for thin shim sheets.
- Omax 80X Series: Precision abrasive waterjet systems for cold-cutting specialty alloy shims.
- Amada AE Series: Turret punch presses for rapid blanking and forming of motor shims.
- Haas VF Series: Vertical CNC machining centers for heavy non-standard spacer milling.
- Komatsu H1F Series: Hydraulic and servo stamping presses engineered for mass shim production.
Leading Manufacturers and Suppliers
Frequently Asked Questions
What are metal shims and why are they important?
Metal shims are precision components used to fill gaps and ensure optimal alignment in mechanical and construction assemblies. They boost equipment durability, efficiency, and prevent damage by compensating for irregularities between machine parts.
Which methods are used to manufacture metal shims?
Metal shims can be manufactured using stamping, CNC laser cutting, water jet cutting, EDM wire cutting, turning, punching, and nibbling. The choice depends on tolerance requirements, material, thickness, volume, and application.
How does water jet cutting benefit shim production?
Water jet cutting produces precise metal shims without heat, avoiding thermal distortion and preserving material properties. It's ideal for heat-sensitive metals, composites, and maintaining dimensional integrity in automotive, energy, and electronics uses.
What machines lead the metal shim fabrication industry in North America?
In the United States and Canada, leading metal shim machinery includes Trumpf TruLaser laser cutters, Omax 80X waterjet machines, Amada AE turret punch presses, Haas VF CNC centers, and Komatsu H1F stamping presses.
What factors should engineers consider when choosing a shim manufacturing process?
Critical factors include production volume, required tolerances, material type, thickness, project budget, lead times, and application needs. Consultation with expert suppliers ensures optimal results for specialized or high-performance shim applications.
Why is CNC laser cutting favored for custom and complex shim designs?
CNC laser cutting allows rapid prototyping, design flexibility, and maintains tight tolerances without tooling. It minimizes waste, offers fast turnaround, and is suitable for intricate or non-standard shim geometries from various metals.
Chapter Four: Types of Metals Used as Shims
Common alloys include stainless steel, aluminum, brass, copper, and galvanized carbon steel.
Comparison of Common Metal Shim Materials
| Metal Family | Corrosion Resistance | Electrical / Thermal Conduct. | Relative Weight | Primary Applications |
|---|---|---|---|---|
| Stainless Steel | Exceptional (316 CRES) | Low | High / Strong | Marine, chemical processing, high-temp shafts, bearing gap spacers |
| Aluminum | High (Passivation) | High | Very Low (1/3 steel density) | Aerospace, automotive pinion alignment, food equipment, lightweight frames |
| Brass / Copper | High (Non-sparking / Antimicrobial) | Very High | Medium | Explosive/volatile gas zones, electrical contacts, plumbing, decorative joints |
| Galvanized Carbon Steel | Moderate (Zinc-coated) | Moderate | High | Heavy structural steel alignment, mezzanine floor leveling, construction |
Chapter Five: Specific Types of Shims
Specialized shim configurations include:
- Edge Bond & Peelable Shims: Multi-layered foils peeled away incrementally for micro-adjustments.
- Arbor Shims / Slitter Discs: Thin ground discs engineered to eliminate axial play in rotary cutters.
- Slotted Motor Shims: Horseshoe-shaped alignment plates engineered to slip around motor foot bolts easily.
- Shim Rings & Variable Shims: Rings maintaining pre-load tightness around bearing housings and punch stripper bolts.
Chapter Six & Seven: Industrial and Domestic Applications
Industrial uses include oil and gas pumps, gearboxes, turbines, thrust washers, and motor foot leveling. Domestic uses span door/window frame squaring, automotive wheel alignment, valve clearance feeler adjustment, and machinery leveling.
Chapter Eight & Nine: Advantages and Selection Considerations
Key advantages include low-cost maintenance (sacrificial wear plates), thermal resistance, precise tolerance control, and extended machinery life. Selection factors depend on operating temperature, static vs. dynamic loads, corrosion exposure, and electrical conductivity requirements.
