CNC machining services
CNC Precision Turning & Metal Component Machining
Kovinski izdelki Hrast specialises in CNC turning and precision machining of metal components with diameters from 2 mm to 52 mm, manufactured to your drawings for the automotive, electrical, white goods, hydraulic, pneumatic and mechanical engineering industries.
What we offer
Precision turning as a production service
- CNC turning of precision metal components from bar and castings
- High-volume and serial production on dedicated machines
- Manufacturing based on customer drawings and technical documentation
- Machining of demanding metal materials, including hardened and stainless grades
- Quality control using advanced contact and non-contact measuring equipment
- Reliable delivery schedules and long-term partnership agreements
Using modern CNC machinery, advanced measuring equipment and four decades of manufacturing experience, we deliver exceptional precision, repeatability and consistent product quality across the whole production run — not just on the first sample.
Processes
Four turning technologies, one quality system
Which machine a part runs on is an engineering decision, not a scheduling one. Getting it right is where most of the cost saving lives.
Sliding head turning
Swiss-type automatics for long, slender components where concentricity over length is critical. The natural home for Ø 2–32 mm parts in high volume.
Turret turning
CNC turret centres for larger diameters up to Ø 52 mm, chucking work, castings and components with heavier milling content.
Hard turning
Super-precision machines that cut hardened material after heat treatment, replacing grinding operations and shortening the process chain.
Rotary transfer
Hydromat machines for very high volume series, where cycle time per part is measured in seconds.
| Process | Diameter | Length | Lot size |
|---|---|---|---|
| Swiss turning (sliding head) | Ø 1–30 mm | 0.5–600 mm | 5,000 – 1,000,000 |
| Automatic turning (bar) | Ø 1–65 mm | 0.5–250 mm | 5,000 – 1,000,000 |
| Turning | Ø 3–65 mm | 0.5–250 mm | 5,000 – 5,000,000 |
| Full-range turning incl. milling | Ø 3–65 mm | 0.5–250 mm | 5,000 – 1,000,000 |
Our standard series production range is Ø 2–52 mm; the table shows the full machine envelope. Machines include Citizen L20, A20, L32 and B12, INDEX ABC, Gildemeister Twin 32, Nakamura WT150 and a Hydromat HW20 rotary transfer machine.
Materials we machine
Metals, and what we use them for
We provide CNC machining services for a wide range of metal materials. Material choice drives tool life, cycle time and process stability, so we will tell you honestly if a specified grade will make your part more expensive than it needs to be.
| Material | Typical application |
|---|---|
| Stainless steel — austenitic | Corrosion-resistant fittings, medical-adjacent and food-adjacent parts |
| Stainless steel — ferritic | Automotive components requiring magnetic properties |
| Stainless steel — martensitic | Hardenable shafts, pins and wear parts |
| Aluminium | Lightweight housings, covers and thermally conductive parts |
| Carbon steel | General machined components in volume |
| Hardened steel | Wear-resistant pins, bushings and shafts |
| ETG free-cutting steel | High-strength parts machined without subsequent heat treatment |
| Forged steel | High-load components with pre-formed geometry |
| Heat-treatable steel | Parts hardened and tempered after machining |
| Tool steel | Wear parts and tooling components |
| Spring steel | Elastic components requiring high yield strength |
| Cold extruding steel | Machining of pre-formed cold extruded blanks |
| Brass | Hydraulic and pneumatic fittings, electrical contacts |
| Copper & copper alloys | High conductivity electrical components |
| Zinc alloys | Cast components requiring machined features |
| Titanium alloys | Aerospace and high strength-to-weight applications |
| Nickel alloys (Inconel, Monel, Hastelloy) | High temperature and highly corrosive environments |
| Thermoplastics | Insulating and low-friction components |
Industries we serve
Where our components are used
Our precision-machined components are used by companies operating in:
- Automotive and vehicle construction
- Hydraulic and pneumatic industry
- Electrical and electronics industry
- Lighting industry
- White goods industry
- Mechanical engineering
- Drive and gear engineering
- Machine tool manufacturing
- Aerospace and aviation industry
- Railway and rail vehicles
- Telecommunications industry
- Precision engineering, mechatronics and optics
- Air conditioning, refrigeration and ventilation
- Fittings engineering
- Boiler, container and tank construction
- Military engineering
Typical parts
- Sensor housings
- Screws
- Pins
- Pivot pins
- Shafts
- Connectors
- Bolts
- Washers
- Bushes
- Nuts
Gallery
CNC turned parts from our production
Questions
CNC precision turning FAQ
What diameter range can you turn?
We machine precision turned components from 2 mm to 52 mm in diameter, from bar stock and from castings.
Do you machine to customer drawings?
Yes. All production is based on customer drawings and technical documentation. We are a contract manufacturer and do not sell a standard catalogue of parts.
What tolerances can you hold?
Our measuring equipment resolves to microns and our sliding head machines are specified for micron-level tolerances. The achievable tolerance depends on material, geometry and process, so we confirm it per part during quotation — and we will say so if a drawing calls for something that is not economically machinable.
What is the minimum order quantity?
Our minimum lot size is 5,000 pieces, up to 5,000,000 pieces per series. Programming, tooling and setting a CNC turning machine cost roughly the same at any quantity, so below that figure the setup dominates the price per part. We are at our most competitive on repeat series.
Can you handle secondary operations and surface treatment?
Yes. Grinding, heat treatment and galvanic coatings are managed through our qualified supplier network, so you receive a finished, plated, washed and inspected part. See finishing on products.