CNC Machining
 
SPG-ARRK is able to provide you with exceptionally high quality CNC milled parts based on your cad-files. Whether you need single parts or a complete assembly, using a combination of high speed CNC machining and traditional modelmaking, we provide what you need. These models are made from a variety of plastic materials. These components are then finished, painted, metalisized, screen or pad printed and finally assembled before shipping to our customer. For further details on this specialist service please contact us directly.
 
 
 CNC Machining
 How does it work?
Parts are realised from a 3D cad-file on 3- and 5-axis CNC centres. Prototype parts can be milled from a wide range of plasic materials can be milled, ABS; PC/ABS; PA; PA GF30; PC GF30; Acrylate.
 Applications
Mechanical, material, functional, assembly, thermal and aesthetic validation.
 Lead time
Typical lead time is ±14 days.
 Advantages
Excellent finishing.
Thin walled parts (minimum 0.5 mm).
Ideal starting point for silicone tooling.
Excellent realism, good accuracy and nice aspect close to true production material.
 Disadvantages
Longer lead time than SLA and SLS.
Higher costs.
 
 Materials
 ABS
ABS is widely used for making shell of product. Surface process includes metallizing, chroming, vacuum metalizung.
 PA6, PA66 and PA+GF30 (Nylon)
These materials combine high tensile strength with excellent flexibility. Also available with added fibreglass.
 PC and PC+GF30 (Polycarbonate)
Polycarbonate has excellent strength, flexibility, transparency. It is often used for lenses or products that require precise geometry. Also availabe with added fibreglass to improve rigidity and thermal resistance.
 PC/ABS
Generally combines specifications of ABS and PC. Also available with added fibreglass.
 PP (Polypropylene)
Polypropylene can be semi translucent, coloured or black. The material has good flexibility and has an excellent resistance for impact, so it's often used for products in some hard conditions of resisiting impact such as: auto parts, folio packing box. Glueing the material is difficult.
 PU (Polyurethane)
This material is casted and polymerized with two or three liquid materials in vacuum condition. The material is available with a very wide range of characterisitcs ranging from rubber to ABS. This vacuum casting method is often used to produce parts in low volumes.
 PU FOAM (Polyurethane)
Polyurethane foam is easy to cut, so it is the best choice for designers to make quick draft models that can be easily adjested by hand. Strentgh is low so , but it's heavy dust is polluted seriously to environment.
 POM (Polyoxymethylene)
Delran, Acetal, it's often used for making mechanical parts with durability and high ridigity, such as gear, cam, belt pully, rack etc.
 UREOL (Chemical Wood)
This material is often used for CNC machining block models, checking CAD-data accuracy, simplified measurement jigs, checking units, masters used to duplicate. It is sensitive to temperature and humidity.
 Acrylate
Acrylic material is also called plexiglass. It is the best material for clear parts. Finishing processes includes dyeing, plating, painting, silk screen printing, etc. It hasn't good colliquefaction, however it is easy to break, so it is not advised to be used for clips, hooks or other functional parts.