Precision Engineering

Tight-tolerance machining delivered with accuracy, consistency and attention to detail.

Precision Engineering

Precision engineering is at the core of what we do, focused on manufacturing accurate, high-quality components to defined specifications.

We machine parts to tight tolerances using the most appropriate process for each application, including CNC machining and specialist finishing methods where required. By selecting the right approach for the material, geometry and end use, we ensure components are produced efficiently while meeting the required level of accuracy.

All components are manufactured in line with customer drawings, with tolerances achieved based on material and process capability. Inspection is carried out throughout production to ensure consistency, reliability and compliance with specification.

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Work Type	Typical Services	Quantity / Scope	Typical Lead Time	Notes
Urgent Local Support	Modifications & Repairs, Precision Engineering, CNC Milling, CNC Turning	Usually 1–5 parts	From 24 hours*	For urgent local jobs where material is available and the work is straightforward. Contact IJF as early as possible to discuss.
Prototype / One-Off Parts	Prototype Machining, Bespoke Machinery, Component Development, CAD/CAM Support	1–5 parts	1–2 weeks	Depends on complexity, material, design input and whether testing or development is required.
Small Batch Machining	CNC Milling, CNC Turning, Batch Production, Precision Engineering	6–25 parts	1–4 weeks	Suitable for repeat parts, replacement components or low-volume production runs.
Bespoke Machinery / Assembly Work	Bespoke Machinery, Fabrication, Finishing & Assembly	Project-dependent	Quoted per project	Lead time depends on design, manufacture, assembly, testing, installation and commissioning requirements.
Ongoing / Repeat Supply	Batch Production, CNC Milling, CNC Turning, Finishing & Assembly	Small batch / scheduled supply	Agreed schedule	Best suited to customers who need repeat parts, call-off supply or planned production support.

*Lead times are indicative and depend on material availability, complexity, capacity and approval times. Urgent work is assessed on a case-by-case basis.

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Process	Max Dimensions / Capacity	Notes
Manual Milling	Approx. 2m x 1m x 1m	Conventional milling capacity for components too large for CNC milling machines.
Manual Horizontal Milling	Approx. 1500mm x 400mm bed travel	Used for larger horizontal milling work and components requiring manual machining.
Manual Vertical Milling	Approx. 1300mm x 500mm x 450mm bed travel	Used for larger vertical milling work across a range of component sizes.
CNC Lathe	Up to 480mm swing over bed x 2m bed length	Suitable for accurate turned components and small batch production.
Manual Lathes	Up to 600mm swing over bed x 3m bed length	Used for larger turned components beyond CNC lathe capacity.
Horizontal Boring	Up to 300mm bore depth	Suitable for larger components requiring accurate boring operations.
Drilling	600mm arm radial drilling capacity	Used for drilling operations on larger or awkward components.
Slotting	Up to 400mm stroke	Mainly used for cutting internal keyways.
Surface Grinding	700mm x 250mm bed size	Used for flat and angled components requiring a controlled finish.
MIG/TIG/Stick Welding	Fabricated structures up to approx. 10m length	Supported by overhead gantry crane. Suitable for mild steel and stainless steel fabrication.
Spark Erosion	Small component detail work	Used for difficult detail, conductive materials and profiles not achievable through standard machining.

Maximum dimensions are provided as a guide only. Capacity depends on component shape, weight, material, access, setup and the machining process required. For larger or unusual components, IJF can advise once drawings or sample parts have been reviewed.

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Process	Typical Tolerance Capability	Notes
CNC Milling	Drawing-led tolerances	Suitable for accurate, repeatable components. Final tolerance depends on geometry, material and setup.
CNC Turning	Drawing-led tolerances	Well suited for components requiring consistent diameters, concentricity and repeatability.
Surface Grinding	Tight tolerance finishing	Used where improved flatness, parallelism or surface finish is required.
Manual Milling	Standard engineering tolerances	Used for larger components or work outside CNC capacity. Tolerances depend on setup and part size.
Manual Turning	Standard engineering tolerances	Suitable for larger turned components beyond CNC capacity. Accuracy depends on size and machining approach.
Spark Erosion	High-detail precision machining	Used for conductive materials and intricate internal features not achievable through conventional machining.
Slotting / Keyway Cutting	Fit-for-purpose tolerances	Tolerances depend on keyway size, fit requirements and mating components.
Fabrication / Welding	Fabrication tolerances	Influenced by material type, weld process, distortion control and final application.

Tolerances are defined by the component drawing and application requirements. Final achievable tolerances depend on material, geometry, size and the machining or fabrication process used. Specific requirements should be confirmed at enquiry stage.

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Finishing Process	Purpose	Additional Information
Hard Anodising	Creates a durable oxide layer on aluminium to improve wear and corrosion resistance.	Typically 25–30 microns thick. Commonly used for external or high-wear components. May require masking and machining allowance depending on the part.
Sulphuric Anodising	Applies a thin decorative finish to aluminium components.	Usually less than 5 microns thick. Primarily for appearance with limited protective benefit.
Bead Blasting	Produces a consistent matte surface by removing machining marks.	Improves visual uniformity and reduces surface reflectivity. Often used prior to further finishing.
Powder Coating	Applies a robust, coloured coating for protection and durability.	Provides a tough, wear-resistant finish. Common for brackets, enclosures and external components.
Chromate Conversion Coating	Improves corrosion resistance while maintaining electrical conductivity.	Typically used on aluminium parts in electrical or electronic applications. Also known as chemical film or conversion coating.
Polishing	Refines the surface to achieve a smooth or high-quality finish.	Used where surface condition is critical, whether for appearance or performance.
Nickel Plating	Adds a protective metallic layer to improve wear and corrosion resistance.	Provides a uniform finish with moderate hardness. Can also be used for aesthetic purposes.
Zinc Plating	Protects steel components from corrosion by applying a zinc layer.	Often finished with clear, yellow or black passivation. A cost-effective solution for general protection.
Burnishing	Improves surface finish and strengthens the material through deformation.	Creates a smooth surface without removing material. Can improve fatigue performance and appearance.
Ultrasonic Cleaning	Removes contaminants such as oils, swarf and fine particles.	Uses high-frequency cleaning to reach complex geometries and internal features. Leaves components clean and residue-free.
Assembly	Combines individual components into a complete or part-complete unit.	May include fasteners, inserts, press fits or sub-assemblies to streamline installation and use.

Finishing processes are selected based on the material, application and performance requirements of each component. Where specific finishes, coatings or surface treatments are required, these should be detailed at enquiry stage.

Other Services We Offer

We offer a wide range of additional engineering services to support different project requirements. If you don’t see exactly what you’re looking for, get in touch. We’re always happy to advise and find a practical solution.

Custom engineering solutions designed and built around your exact requirements.

Examples Of Our Components

A selection of components we’ve manufactured for customers across a range of industries, showcasing the scope, accuracy and quality of our machining.

Gripper Jaw

Specialised Gripping Component

CNC Milling
Hardened Tool Steel

Pintle

Machined Component

CNC Turning
Carbon Steel

Screw Top Bearing Unit

Machined Bearing Housing

Modification & Repair
Carbon Steel

Sprocket

Precision Machined Drive Component

CNC Milling
High Density Polyethylene

Tight-tolerance machining delivered with accuracy, consistency and attention to detail.

Precision Engineering

Other Services We Offer

Bespoke Machinery

Fabrication

Component Development

CNC Turning

CNC Milling

Modifications & Repairs

Examples Of Our Components

Gripper Jaw

Pintle

Screw Top Bearing Unit

Sprocket

Frequently Asked Questions