• Faq
  • How does CRP compare to western suppliers on price?

    This is a complex question. China’s greatest advantages is the labor cost. Comparing it with the developed countries as an average, workers’ pay is approximately 1/6th.

    As a general rule, labor rich work is considerably more competitive than technology and material rich work. But this is not always true.

    SLA & SLS is may not very competitive from China unless you start to do full cosmetic finishing to the raw SL/SLS model. Then it can be about 66% of the western prices.

    Vacuum Casting of PU is typically about 50% of western prices. The expensive content here is the imported Axson resin. That said, vacuum casting and the subsequent finishing is very labour intensive.

    Rapid Tooling for Plastics is almost always half the US/European price.

    Pressure Die manufacture and Die Casting of aluminium and zinc can be as little as 25% of the western prices, but certainly 50%.


    What are the main applications of Rapid Prototyping?

    Although there is a big listing of prototyping applications. This technology is maturing rapidly specially in automotive, medical, toys building, packaging, aerospace, electrical, scientific applications and so on.

    Few examples here :

    a) Imagine there is a major exhibition next week and your new product is still in development stage, How to get the part urgently? just send us your CAD file rest is up to us to meet your deadline.

    b) Why to take a risk of getting unrealistic quotes from your suppliers by sending 2d drawings, when you can send inexpensive 3d physical part which will not only help to save money at the end but also helps to open new options to manufacture the part or tooling.

    c) Manufacturers who need parts in small quantities where tooling or production cost is not justified.

    d) Sometimes it is difficult for the designers or toolmakers to visualize or find out the problems in the drawings, by having the 3d part in their hands, helps them to figure out the problem and redesign it if required before investing on actual tooling.

    e) Quickly making master model for vacuum casting to produce small quantity of Poly Urethane parts.

    f) If you are a student, scientist, teacher and you need to make a part for your next project or class demonstration, what to do? Rapid prototyping is the quick answer for you.

    g) Building my new home but like to see how the design will look like in real life.

    h) To make some Artistic or unique design for example statue, jewelry, special type of toy even some part is broken of your home appliance which is not easily available in the market.

    i) Any spare parts or auto part hard to find in the market.

    j) Tooling inserts for plastic injection moulding direct in steel able to produce thousands of parts.


    What about the part surface finish after finishing ?

    Normally all prototyping processes require post processing operation to give a smooth finish. SLA process still gives much better finish than 3D printing and SLS process. Normally parts are finished with standard finish; means outer or visible faces are lightly sanded and internal features are left machine finish. But surface finish can be further improved by fine sanding, polishing or painting which is only done upon special request from customer and increases the prototype cost. These prototypes can be even further machined or drilled as a secondary operation.


    What if we are not completely satisfied with the parts we receive?

    If it is practical to do so, we will replace free of charge any parts that you are not completely satisfied with. If that is not practical, then we will credit the customer a negotiated sum.


    Do you work in Millimeters or Inches?

    MM (Millimeters).


    What file formats does CRP need for Rapid Prototyping?

    We can take native Pro-E files and native SolidWorks files along with IGES and STEP and STL files.


    What file formats does CRP need for Rapid Tooling?

    we can take native Pro-E files and native SolidWorks files along with IGES and STEP files.


    What is preferred 3D Cad file format for cnc machining?

    We prefer cad files in one of these formats:

    •PARASOLID (.x_t or .x_b)

    •STP or STEP (.stp or .step)

    •IGS or IGES (.igs or .iges)

    •ProE Native Files (.prt)

    •ACIS SAT (.sat)


    Can you use STL file for machining?

    Sorry, we cannot use STL file for machining. We can use STL file for viewing or quotation purpose but need 3d CAD file in Parasolid or STEP or IGES format for machining.


    Can you use 2D file for machining?

    Occasionally we may accept 2D files like Autocad .dwg or .dxf formats for 2D machining, routing or wire-cutting jobs.


    What is CNC machining?

    CNC, stands for Computer Numerical Control, applies to machine control system but erroneously used as a replacement term for NC. CNC is a generic term for vast field of numerical controllers. Our application is related to CNC Milling; used for machining complex parts and shapes hard to machine with conventional machines. Firstly cutter path is generated direct from the CAD model, which is transferred to machine controller in the form of numerical data. This data is used to move the machine table and tool to create the high precision jobs.


    What are the Advantages of CNC machining?

    •No need to compromise with raw material because parts can be machined directly out of engineering plastics, ferrous or non ferrous metals.

    •Suitable for accurate and highly finished parts.

    •Economical for small to short run of production parts that require wide range of operations to be performed.

    •Generally large and bulky parts are economical by cnc machining compared to Rapid Prototyping processes because most of RP proprietary materials are expensive.


    What are the Disadvantages of CNC machining?

    •Need to spend considerable time for programming before actual machining.

    •Sometime sharp corners are difficult to machined due to cutter radius which need to be sharpened by secondary operation.

    •Undercuts are difficult to machine so sometimes parts need to be made in sections and glued to accommodate undercut features.

    •Deep and narrow pockets/slots could be difficult to machine due to cutter size constrains.


    What is your most common plastic material used for general purpose components?

    ABS, (Acrylonitrite Butadine Styrene) is general purpose rigid Thermoplastic with a combination of properties that make it ideal for the widest range of applications.


    What is suitable material for living-hinge featured components?

    •We normally use PP(Polypropylene) for living hinge parts


    What is suitable material for clear transparent lens like parts?

    •Acrylic, also known as PMMA (PolyMethyl-MetaAcrylate) is an amorphous thermoplastic material with very good optical clarity.

    •PC (PolyCarbonate) can also be used for clear parts but clarity is bit lower than Acrylic. If you need combination of clarity and strength then Polycarbonate could be better choice.


    What are other materials you use for machining?


    •ABS, Polycarbonate(PC), Acrylic(PMMA), Acetal(POM), Nylon(PA6), GF Nylon, PP(Polypropylene), HDPE (High Density PolyEthylene), Teflon.


    •Aluminium 6061, Aluminium 5083, Brass, Mild Steel, Stainless Steel, Zinc

  • Add:No.3 Building, Lane 7, Maiyuan Road, Xin’An district, Chang’An Town, DongGuan, GuangDong, China
  • Tel:+86-769-85356855 Fax:+86-769-85356355