CNC Machining is a subtractive manufacturing process to cut material from a block and get the solid in shape from the 3D programming, it is one of the important processes for prototyping and low volume production. It fulfills most of the manufacturing requirement by the fast turn-around, multi-axis, high-speed CNC machining, turning (lathing), milling, grinding and EDM solutions.
CNC machining for metal parts enables designer to get a final metal Prototype model directly by machining the 3D concept out of a block of metal material. These metal material options for CNC machining can be Aluminum , Magnesium, Zink, Titanium, Brass, Bronze, Copper, Tool steel and all kinds of stainless steels like AISI, SUS,SS ,17-4PH and so on.
CNC machining for plastic parts enables client to have the far-range material selection for high precision and tested quality plastic parts no matter it is big or small, master patterns or final products, rugged prototype mockups or short run productions. material options are ABS, PC, ABS PC Blend, PMMA, PP, POM, PA, PA+GF, PEI, PVC, PEEK, PPS, PTFE, Bakelite, PU molding board (renshape), Ceramics and so on.
Aluminum alloy and Magnesium alloy are two kinds of soft metal that in low density but in high fatigue resistance. Their performance are close to or even superior to high quality steel, and they own the good plasticity and excellent process-friendly ability in rapid metal machining prototype and production.
Zinc Metal and Titanium Metal Machining are also one of the most important metal prototyping processes for CNC machining. They are in higher density and high mechanical property compared to Aluminum alloy and magnesium alloy. They are stronger in strength, and in harder and heavier performance.
From carbon steel to alloy steel, tool steel to stainless steel, steel is widely used in industrial production, Mild steel and Stainless steel like AISI, SS, SUS, 17-4H 49alloy and so on, are the most common steel that use for CNC prototype machining and low volume to mass production manufacturing.
Brass material, bronze material as well as the copper material is under a very good thermal conductive and eletrconic conductive property, they prefroms diffrent under different ratio contents of Cu element. They are mostly applied for heating components, conductive function components and fitting parts
Clear Acrylic (PMMA) Parts machining is an important process for clear parts prototyping and low volume productions, PMMA CNC machining Process Includes the 3-axis, 4-axis and 5-axis machining and milling centers, which makes it all possible to cut the block material into shape of the 3D structure.
Clear Acrylic PMMA CNC machining is a high skilled required process. The part appearance, status, tolerance function and finishing acts prefect or not in the final prototype parts depends a lot on the original machining process. Small defeats and operating miss during machining will cause big issues for the final product which can only be found till the end of the high polish, it means all the previous work in put will be wasted and can only be discovered till the end.
High polish is starting right after the 2000# sanding process when the part is smooth but foggy, this clear polish process is under the help of the polish paste and skills to make the part optical clear as the original material block.
However, for this process, except the important assembly position, the surface tolerance is hardly to be high precision because there are a lot of hand sanding works to remove material from the part that tolernce will miss from the back and forward polish, so the important tolerance should be marked in 2D .
Polycarbonate (PC) is a good mechanical properties plastic material, the same as PMMA CNC machining, Clear PC is also processed by 3-axis, 4-axis and even 5-axis CNC machining and milling centers. the Clear Polycarbonate (PC) is used for those functional parts in structures and required to be Clear.
The transparence finish treatment for Polycarbonate (PC) after CNC machined is sanding and Vapor polish process. As PC material is in good strength, PC part sanding is a tough and slow work to use a pieces of sanding paper to remove the spare material from the part. Hence most of the time, PC parts CNC machining requires programing to make the part with the minimum machining tool to get the CNC mark and CNC lines light for easier the sanding work .
Vapor polish is the polish finish for PC CNC machining, like hand highly polish for optical PMMA parts, but they are totally two different process. The PC vapor polish is using the steam of methylene chloride to melt and remove the small roughness features and defeats on top of the part surface inside out ,
CNC machining Polycarbonate (PC) vapor polish prototype is widely applied for complex geometries parts, like medical device housing covers, engine covers, security protected parts, Car lens housing and mechanical parts.
What kind of prototype parts will use Clear PMMA CNC machining process?
Well, first of all, the application for CNC machining and high optical polishes are automotive lighting prototype products and car lamps prototype products like eyebrow bezel optics parts, wing bezel optics parts, lens filter parts, Lens inner parts, car lamps cover and light guide pipes , these parts are all required to be optical clear polish after CNC machining. and the second, display parts or display windows, show boxes, exhibition parts like mini cars, coffee machine containers, covers, front panels Etc., as long as the requirement is Optical clear prototype, PMMA CNC machining and high polishing is always the first option.
there is another situation that the light pipes with the optical area for the light transmits, will need to left the optical area with machined finish only, becasue a tiny dierection change of the teeth will impact a lot on the light transmits.
Opaque Plastic material including all the machinable block plastic material are mostly color in black ,white and beige. These opaque materials are the most important plastic for CNC prototype machining , in the application of plastic prototypes, plastic product shells, housing, enclosures,frames and mockups.
The Opaque material options are ABS, PC, ABS PC Blend, PMMA, PP, POM, PA, PA+GF, PEI, PVC, PEEK, PPS, PTFE, Bakelite, PU molding board (renshape), Ceramics and other could-buy opaque plastic materials, as long as the plastic material is machininable, it is support able from our CNC machining process.
Among all, ABS plastic is the most common used material in opaque plastic machining, it is the less cost and most easier peeling plastic block . The ABS material allows the spliting & glue bond process, and it is suitable for all kinds of post finish treatments like sanding, polishing painting, plasting and printing.
At Sandi rapid made, we are full aware of the importance of clients’ requirements. Our goal is to provide client the professional prototyping and productionservices, technical processes solution and excellent final products. we are your CNC machining EXPERT.
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