Precision CNC-machined fixture plates serve as the foundational locating and clamping interface for CNC milling centers and automated workholding systems. Built from stress-relieved high-strength aluminum or cast iron, these plates provide precise grid patterns (metric or imperial) with tight positional tolerances. They reduce setup times, ensure repeatable workpart positioning across production batches, and integrate directly into existing T-slot or sub-plate receiver systems.
Key Features
Grid Pattern Architecture: Precision-machined tapped holes (M6, M8, M10, M12 or 1/4-20, 3/8-16) paired with precision dowel pin holes (H7 tolerance) for rapid, repeatable modular fixture alignment.
Structural Stability: Engineered with optimized ribbing or solid plate thickness to resist clamping distortion and maintain rigidity under heavy cutting loads.
Critical Machining Zones: Reference edges (ground to sub-micron squareness), mounting locating bores, and surface flatness machined in a single setup on large-envelope gantry mills or horizontal machining centers (HMCs).
Technical Specifications
|
Parameter |
Metric Standard |
Imperial Standard / Custom Range |
|
Standard Dimensions |
300x300mm to 1000x2000mm |
12"x12" up to 40"x80" |
|
Thickness Range |
25mm – 100mm |
1" – 4" |
|
Flatness Tolerance |
<= 0.01mm over 300mm |
<= 0.0005" per foot |
|
Grid Pitch |
50mm / 100mm +/- 0.01mm |
2" / 4" +/- 0.0005" |
|
Thread Tolerance |
ISO 6H (Tapped holes) |
2B / 3B |
|
Dowel Hole Tolerance |
H7 reamed +/- 0.008mm |
.0005" reamed |
|
Surface Finish |
Ra <= 0.8 μm (Ground / Milled) |
Ra <= 32 μin |
Materials & Machining Processes
Material Selection
Aluminum 7075-T6 / 6061-T6: High strength-to-weight ratio, rapid thermal dissipation, ideal for high-speed machining and frequent manual handling.
Cast Iron (GG25 / G250 / Ductile Iron GGG60): Superior vibration damping, excellent wear resistance, recommended for heavy roughing and high-tonnage clamping.
Tool Steel (P20 / 4140): Pre-hardened options for extreme wear-resistance applications.
Machining Operations
Rough Milling & Stress Relieving: Thermal stabilization cycles applied prior to finish machining to eliminate internal residual stresses and prevent post-machining warp.
High-Precision CNC Milling: Executed on multi-axis vertical and horizontal machining centers (featuring high-rigidity spindles and thermal error compensation) to maintain strict perpendicularity between top clamping surfaces and mounting bases.
Precision Boring & Tapping: Rigid tapping and interpolated reaming ensure thread pitch accuracy and exact pin-to-hole center distances.
Applications
3-Axis & 5-Axis CNC Milling
Complex aerospace brackets, structural housings, and multi-side component machining.
Automotive Powertrain Lines
High-volume transfer lines and dedicated robotic workholding fixtures.
CMM Inspection Stations
Modular gauging fixtures and coordinate measuring machine positioning arrays.
Medical Device Manufacturing
Stainless steel or hard-anodized aluminum plates for surgical instrument production fixtures.
Customization & OEM Services
Build-to-Print Manufacturing
Production strictly executed from customer CAD models and engineering drawings (STEP, IGES, DXF, PDF).
Custom Grid & Pocketing
Integration of specialized T-slots, custom counterbores, weight-reduction pocketing, and vacuum channels.
Sample & Prototype Support
Low-volume prototype runs available for fixture validation before full production scaling.
Batch Production
Scalable capacity for recurring OEM blanket orders with scheduled call-offs.
Quality Control & Inspection
Dimensional Verification: 100% inspection of critical mounting dimensions, hole patterns, and edge squareness using bridge-type CMMs (such as high-accuracy Hexagon systems) and laser interferometers.
Flatness & Parallelism Testing: Measured on precision granite surface plates using dial test indicators (DTI) and optical flats.
Documentation: Material Test Reports (MTRs) tracing raw material melt chemistry, full CMM inspection reports, and Certificates of Conformance (CoC) provided with every shipment.
Packaging & Shipping
Corrosion Protection: Cleaned, degreased, and coated with volatile corrosion inhibitor (VCI) oil, then sealed in heavy-duty VCI barrier bags.
Physical Protection: Machined reference edges protected with high-density edge guards; plates bolted securely to custom ISPM 15-compliant fumigated export wooden crates to prevent shifting during transit.
Logistics: Air and ocean freight forwarding with shock-indicating labels upon request.
FAQ
Q: What is the standard lead time for custom fixture plates?
A: Prototypes typically ship in 2 to 3 weeks. Production batches (5–20 pieces) require 3 to 5 weeks depending on material availability and anodizing/heat treatment schedules.
Q: What file formats do you accept for quotation and manufacturing?
A: We accept STEP, IGES, Parasolid, and SolidWorks files paired with 2D PDF drawings detailing tolerances, thread callouts, and surface finish requirements.
Q: What is the minimum order quantity (MOQ)?
A: No strict MOQ. Orders start from 1 prototype piece to full production runs.
Q: Can you supply plates with surface treatments like hard anodizing?
A: Yes. Aluminum plates can be supplied with Type III hard coat anodizing (thickness 50µm, hardness 60-70 HRC) for enhanced wear resistance. Cast iron plates can be supplied with black oxide or electroless nickel plating.
Q: How do you prevent plate distortion during shipping and installation?
A: We utilize stress-relieved raw materials, balanced machining passes, and rigid wooden crating with internal bracing to ensure flatness is maintained upon arrival.
Q: Do you provide material test certificates?
A: Yes. Full mill test reports (MTRs) tracing the raw material melt chemistry and mechanical properties are supplied with each shipment.
Request a Quote (RFQ) & Resources
To receive a rapid and accurate technical quotation, please provide the following details:
Engineering Drawings: 2D PDF with tolerances and threads + 3D CAD model (STEP format).
Material Specification: Specific grade (e.g., Aluminum 7075-T6, Cast Iron GG25).
Quantity: Prototype quantity vs. annual forecast / batch size.
Surface Treatment: Bare metal, hard coat anodized, black oxide, or ground finish.
Special Requirements: Specific delivery timeline or custom laser-etched coordinate grid markings.
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