Working: All the 3D printers’ posses five basic process functions for creating a three-dimensional model.

First – The Print Surface is fed with a unique powder.

Second – The powder is spread on print surface by a roller at a preset depth. This process takes just a few seconds for its completion.

Third – Color is applied to the powder’s initial layer by the Standard Inkjet Print Heads.

Fourth – The solidification of powdered layer takes place.

Fifth – The lowering of print surface for powder’s another layer is enabled.

This process goes on repeating till the completion of the whole 3D model occurs. The mixture of Ink Jet Color and powder results in formation of a bond. The solidification occurs this way. So, if no printing is carried out at the specified layer or location, the powder retains its state, i.e. it does not get solidified. Once the printing process comes to a halt, the powder gets blown out, thereby leaving the output which is the reflection of the original model or drawing. Depending on complexity and size of output, this process takes around ½ an hour. These 3D printers do a commendable job, especially when pre-production examples or working prototypes of the specified objects are seen on the computer monitor.

Self-replicating 3D printers: The ’self-replicating rapid prototype’, better known as RepRap is believed to lessen the price of three-dimensional printers, thereby paving way for the future where spare parts and broken objects are just re-printed on a homely basis. There would also be a way out for creation of unique and novel objects.

At present, 3D printers of the above type cost around $25000. They are still to capture the domestic market. They are instead being used by the industry for developing parts for machines like aircraft engines, hearing aids, and spaceships.

Plummeting Prices: Adrian Bowyer has strongly believed the prices of self-replicating 3D printers to lower to around $500, as no cost other than that of raw materials would be involved. He has further stated that these machines would turn out to be more competent and build up new capabilities. Once the soft ware guiding the process of self-replication becomes available, it would be there at the free service of the customers. This has also been said by Adrian Bowyer.

Tepid Metal: Circuits are normally built by 3D printers by carrying out the fusion of powdered metal and laser. However, the self-replicating 3D printers are aimed at use of metallic alloy of cadmium, tin, lead, and bismuth that have a low-melting point and squirting them to have the circuits formed from a syringe that is thoroughly heated. It’s not compulsory for the machine to be capable to assemble itself. Just production of all those parts that are very necessary excluding the lubricating grease and microprocessors is required.

Go to Prototype Zone to get your free ebook on Prototyping at Prototyping. Prototype Zone also has Rapid Prototyping Forum, 3D Printer Blog and other information on Prototype Information and daily news. You can Find Prototype Zone at http://www.prototypezone.com/

Article Source: http://EzineArticles.com/?expert=Ryan_Rounds

* Composite Injection
* Kirksite Injection
* Silicone Vacuum Cast
* Zinc and Aluminum Plaster Cast
* Spray Metal Injection
* Sand Cast

Rapid tooling is becoming a new model for the industry. It’s used as prototype tooling and used mainly for low-volume production. Depending on the part design and the choice of the material being injected, there can be numerous parts developed through this technique. The rapid prototype tooling services creates precise molds faster and with high-speed milling capabilities. The RT machines can run up to 42,000 RPMs and can have a tolerance of .0002″. It is the most accurate method of any rapid prototyping equipment used for rapid tooling. RT is not about the process but it is all about fast results that can be achieved and success is gained by employing a leading-edge technology. It is the combination of tools, methods, processes and people that makes the solution rapid. Rapid tooling is the result of an additive process driven by 3D (Dimensional) CAD (Computer Aided Designs and requires little or no machining. The use of “rapid tooling” in work area attracts the attention of buyers and consequences are direct increase in sales.

EMS USA provides rapid prototyping services, such as stereolithography (SLA), rapid tooling, rapid manufacturing

Article Source: http://EzineArticles.com/?expert=Jon_T_Smith

The race in rapid tooling to get either functional prototypes or low-volume production parts has created many methods of rapid tooling, which have worked well and not so well. The downside to each of these methods has been the consistency and the lack of broad use from application to application.

Due to thick wall sections and dimensional warping, the mold was modified to core out the plastic part. Images courtesy of Vista Technologies.

Old school rapid tooling was very niche-specific. One method would work well for open and closed molds, while another method was better for running 20,000 parts. Previous methods that were used include Direct Aim tooling, epoxy tooling, SLS Laserform and Keltool. These methods had their strengths, but carried stronger weaknesses–such as poor tolerance, tool life and narrow material selections that you could inject under pressure.

Since people tried to use these niche methods of RT across a broad base of projects and had more failures than successes, people started to label all methods of RT as very limited. Once people were exposed to a less than successful RT project, these labels became gospel.

However, times have changed, and it is time to dispel these rapid tooling myths, which have plagued the RT industry and prevented many people and customers from successfully benefiting from the technology. It is important that people are exposed to the truth about RT. Here are the six main myths of RT that have plagued the industry.

You cannot make tool modifications in a rapid tool.
You cannot capture undercuts in a rapid tool.
You cannot shoot clear parts in a rapid tool.
You cannot shoot high volumes in a rapid tool.
You cannot shoot large parts in a rapid tool.
You cannot shoot most engineering grade materials in a rapid tool.
Before the myths are dispelled, we should first describe what method of rapid tooling we are discussing. This method is using 7075-T6 aluminum rapid tooling that has been milled using high-speed milling (30,000-42,000 rpms). Delivery of these molds varies from vendor, but in general you can get a consistent delivery in two to three weeks.

Six Truths of Rapid Tooling

1. You can make tool modifications in a rapid tool.

Aluminum tools can be welded, inserted and re-machined. In fact, for every 10 molds made, six get modified after the first sampling due to part redesign. This has been a great advantage because now people can spend less time and money making tool modifications on a prototype mold rather than spending even more time and money in changing the production mold.
Changes in molds can vary from changing part features, hole sizes, eliminating sink and even changing gate locations. Most of these changes occur after first parts are shot, assembled and tested. With spec materials fit and function are now easy to test under real elements. If adjustments are required the tool is then modified to meet the new part design.

2. You can capture undercuts in a rapid tool.

Undercuts, side actions or side pulls can all be designed to be captured in aluminum tools. These features can be captured by hand pick-outs and manual slides. By making these pick-outs manual, it keeps cost and delivery to a minimum. This is advantageous to the customer, but not the supplier because it adds complexity to the mold design, the machining and the mold assembly.

The biggest disadvantage to the supplier is that you need to run these molds in a press with a processor at the machine to manually disassemble all the pickouts. If you only run open and close tools, these molds can run unattended. This is the reason many people did not offer making rapid tools with undercuts. With newly developed moldmaking software and a better awareness of cycling at the press, molds are being shot everyday capturing undercuts with hand pickouts and manual slides.

3. You can shoot clear parts in a rapid tool.

Aluminum molds can be polished and/or textured to shoot clear or transparent parts. This is a secondary procedure, the same as you would have in a production mold. The aluminum can be polished up to an A-2 finish. A-3 is more typical and lasts longer in production runs. Depending on the material being run, the A-2 finish might see more wear and dull the finish over time.

Polycarbonates and acrylics are the most commonly run materials to get a clear plastic part. Many materials have been run
with a custom transparent tint from Udel to polycarbonate.

4. You can shoot high volumes in a rapid tool.

High volume is a relative term, so let’s define it as 50,000 parts. Obviously, a lot of projects need runs larger, but 50,000 is quite a contrast compared to the 500 quantities that were rumored off rapid tooling. These volumes are limited to material and part design, but many molds have shot abrasive materials with multiple pickouts in the tens of thousands.

Again, processing at the press and having the need for speed, but not the greed for speed are the important variables in running larger runs. If you are trying to match production mold cycle times with aluminum, you will eventually run into issues. If you use common sense and finesse, you will capture benefits of higher volumes from your aluminum tool.

5. You can shoot large parts in a rapid tool.

Again, this is a relative term. Large parts for a medical company may not be considered large for an automotive company. The point in this myth being dispelled is that aluminum tools are not limited to a six-inch cube.

On average, many parts do fit into this frame. There are still many parts that exceed the 18″ x10″ x6″ envelope that are being made in an aluminum rapid tool. This is a very common practice that allows for great price reductions and helps in reducing leadtimes.

6. You can shoot most engineering grade materials in a rapid tool.

Using aluminum tools allows you to sample the same materials as you would in a production mold. Glass-filled Nylon, Ultem, Peek and PVC have all been run in aluminum tools. These molds can be cooled or heated to meet the processing requirements. The day of only shooting ABS or Santoprene is over. Filled materials, exotic materials and waxes are all being sampled in aluminum tools everyday to get functional prototypes or low-volume production parts.

These are the six main myths that have held aluminum tooling back from helping to jumpstart projects into a smoother transition in production. Other myths that should not be ignored are the ability to also do insert molding, over molding and making family tools. Also, tolerance in a rapid tool does compare to a production tool. This has been proven time and time again from first runs to final runs.

In conclusion, many projects have been brought to production with questions unanswered, over budget and with forecasts and timelines being missed that could have all been prevented by using rapid tooling. The next time you have a need for 50 to 50,000 parts from a spec material, do not let the myths of rapid tooling lead you astray.

Owner of Mold Making Technology

Advisor to Rapid Tooling

Article Source: http://EzineArticles.com/?expert=Dan_Mishek

Stereolithography Apparatus, or more commonly known as SLA, is a commercially Rapid Prototyping process which is still widely used today to provide better accuracy and finish to a surface than the other rapid prototyping technologies on the market.

The Stereolithography Apparatus (SLA) technique was originally developed by 3D Systems of Valencia, California back in 1986. SLA allows for a rapid prototyping service, turning a 3D CAD drawing into a solid object. Most SLA can be used as master patterns for injection molding core and cavity inserts, thermoforming, blow molding, and various metal casting processes. Rapid prototyping exploits a SLA Pattern, which can be generated using a CAD file. SLA is a pattern used in place of a wax pattern for the lost wax process of investment casting. The result is a casting that can be put into use to prove the process without the heavy investment in permanent tooling.

Some benefits for utilizing a SLA Rapid Prototyping process are that it is:

* Inexpensive
* Does not require much time
* Uses a light-sensitive liquid polymer
* Requires no milling step or masking steps
* Investment casting patterns allow rapid production of metal prototypes

Investment casting companies have created castings for customers using the SLA Patterns across the nation. These investment companies utilize the SLA pattern and process it through the foundry in the same manner as the wax pattern. This has allowed their customers to evaluate the effectiveness of their overall design. Once verified, a decision can be made on investing in permanent tooling with the security of knowing the design functions properly with no additional changes needed.

Hello, my name is Pat Shebby and recently I have been doing a lot of research in the lost wax casting process in the steel industry.

Article Source: http://EzineArticles.com/?expert=Pat_Shebby

Origin: Rapid prototyping has taken virtual designs through ‘animation modeling software’ or ‘computer aided design (CAD)’. Thereafter, transformation into virtual, thin, horizontal cross-sections takes place. Each cross-section then gets created in the physical space. This process goes on till the model gets completed. It is better known as WYSIWYG process. Let’s understand this process in detail.

WYSIWYG: WYSIWYG as the abbreviation for ‘What You See Is What You Get’. It is used in ‘computing’ for describing a system wherein content looks similar to final product at the time of editing. It is generally used in word processors. However, this use is in the form of HTML (Web) authoring. The popularization of this phrase was carried out by the comedian ‘Flip Wilson’. His character ‘Geraldine’ used to say this very often to give an excuse against her idiosyncratic behavior.

This expression came to be applied later to computer-based applications as practicality in technology arrived. At times, it is phonetically spelled as ‘Wizzywig’ or ‘Wizywig’. It has also been used as a brand name for a ‘lighting design tool’ utilized in theatre industry to pre-visualize the shows and 3D CAD.

The process further : The additional fabrication causes the machine to read data from CAD drawing. After that, consecutive layers of powder, sheet material, or liquid are laid down. Likewise, a model gets built-up from a chain of cross-sections. Such layers, corresponding to CAD model’s virtual cross section, are then fused automatically or joined together for creating the ultimate shape. The basic advantage of additive fabrication goes to state that any geometric feature or shape can be created through this.

The CAD software and machines are interfaced by the ’standard data interface’ in the ‘STL file format’. The function of STL file is approximating the shape of an assembly or a part by making use of triangular facets. Surfaces of higher quality are produced by smaller facets.

The word ‘rapid’ can be used relatively. The construction of models using present-day methods could take time ranging from a few hours to a few days. This depends on the technique used, along with the complexity and size of the model. The additive systems take less time. They can produce models within some hours. Some techniques such as ’solid freedom fabrication’ make use of two materials for construction of parts. The 1st material is known as ‘part material’ and the 2nd one as ’support material’. The removal of support material takes place by heat. It might also be dissolved with water or any other solvent. When it comes to manufacture of plastic products, that too in large quantities, injection molding proves to be a cheaper alternative.

Go to Prototype Zone to get your free ebook on Prototyping at Prototyping. Prototype Zone also has Rapid Prototyping Forum, Prototype Manufacturing Blog and other information on Prototype Information and daily news. You can Find Prototype Zone at http://www.prototypezone.com/

Article Source: http://EzineArticles.com/?expert=Ryan_Rounds

If you need the highest quality of trade show displays stuff which will give you the best display for your exhibition, you should come to the CamelBackDisplay.com which will give you the best offer of any kinds of display that you need. They also have the high quality of truss that will give you the other kind of satisfaction in any table that you need to have in your exhibition. The exhibit booths that they have also will give you the best show in your exhibition which will make you get the best popularity of any product that you have. They also have the best design of logo floor mats that make you satisfy with their services.

Due to their ability to produce data models that can be directly manufactured from, 3D laser scanning services are primarily associated with the traditional engineering and reverse engineering processes. However, the use of additive manufacturing technology in contemporary rapid-prototyping also requires the aid of laser scanning, particularly in the form of solid CAD models. Laser scanning produces three types of data models: polygon mesh models, surface models and solid CAD models. Polygon mesh models-also known as mesh models-are virtually un-editable, and are typically used for archiving or product visualization. Surface models are more editable than mesh models, but are only editable at their surface, making them ideal for modeling artistic and organic shapes. Solid CAD models, on the other hand, can incorporate design intent.

When a future product is expressed in solid CAD form, its data points can be used to begin the rapid prototyping process, which commonly commences with the What You See Is What You Get (WYSIWYG) process of transforming the model into thin cross sections, or “layers”, that are then realized as physical layers of material that can be melted together to form a product identical to the Solid CAD model. A laser scanning service that offers rapid prototyping services will generally offer various 3D digitization technologies for rapid prototyping, including but not limited to: Stereolithography (SLA), which offers the advantage of making functional parts with production quality materials; Computer Numerical Control (CNC) Machining, which is ideal for creating concept models that require specific material qualities; and Fused Deposition Modeling (FDM), which offers the advantage of using stable thermoplastics for highly durable prototypes.

Rapid prototyping is relatively inexpensive to implement on a commercial basis, with most rapid prototyping machines costing roughly $30,000. However, the laser scanning equipment necessary for contemporary prototyping methods can easily lead to a six figure cost for a single scanner. As a result, many companies choose to outsource their scanning needs to scanning service providers, many of whom travel to worldwide locations due to laser scanning’s universal approach and the easy portability of scanning equipment.

In my research on 3D laser scanning services, I’ve researched the value of a 3D laser scanning service to rapid prototyping operations.

Article Source: http://EzineArticles.com/?expert=Jimmy_Drago

Nonetheless, both these machines are used in fabricating scale models used in engineering, automation, manufacturing and mechanics. In recent years, however, the use of these machines has expanded beyond the confines of engineering to medicine, education, and even the arts. But what makes these machines different from each other?

What Are Rapid Prototype Machines?

The term “rapid prototype machine” actually refers to a wide range of machines that use many different technologies to create scale models. These technologies have names such as stereolithography, where photosensitive resin is shaped and hardened by a laser beam; solid ground curing, where the resin is cured with ultraviolet rays; or fused deposition modeling, where melted polymer is built in layers around a support structure.

Regardless of the technology used in these machines, the procedure used in creating models is almost uniform. A model is generated using CAD software, and the model is then converted into a file with an STL extension. The rapid prototype machine then processes this STL file by slicing it layer by layer. These layers are then produced on a platform using resin, and once completed the model is finished and cured.

3D Printers Are Rapid Prototype Machines

As for 3D printers, they are actually a subclass of rapid prototype machines. What makes them distinct from the other rapid prototype machines is that they are faster. The word “rapid” in rapid prototype machines can be misleading because creating models with them can still take days, even weeks. With 3D printers, you can have your model within a matter of hours, even minutes.

Most machines that are classified as 3D printers make use of inkjet printing technology, which is why they are called “printers” in the first place. This does not mean that 3D printers use inkjet technologies exclusively. There are such machines that also use derivatives of the fused deposition modeling process or the ultraviolet curing process. In 3D printers that use inkjet technology, the resin is sprayed on the printing platform using inkjet nozzles.

Another characteristic of 3D printers is that the base materials they use are usually non-toxic and do not require curing or finishing. This is a big contrast with 3D models created with stereolithography, for instance. In stereolithography, the resins that operators work with can become toxic if left uncured.

In addition, 3D printers are a lot less expensive. A starter 3D printing machine can cost US$15,000. While that figure cannot be considered cheap, it is relatively inexpensive compared to high-end rapid prototyping machines that can cost hundreds of thousands of dollars. There are also 3D printing machines that you can make on your own using starter kits and open source software.

This Article is written by John C Arkin from PrintCountry the contributor of PrintCountry Articles. More information on the subject is at PrintCountry, and related resources can be found at Printer Cartridges.

Article Source: http://EzineArticles.com/?expert=John_C_Arkinn

Advantages and Disadvantages:
Stereolithography provides a quick and simple means to convert CAD models into real objects. This is very useful where time is money. The constraint as mentioned above is that the time to produce three dimensional parts depends upon the size and complexity of the object. The accuracy is very good having tolerance within .004″/inch. The problem again is that SLA devices or machines are too expensive. Photo-curable resin used in Stereolithography can cost as high as $800 per gallon. Then the process involved in SLA produces fumes due to which it requires a well ventilated environment

Best Part of Rapid Prototyping:
Since 1986, the year of its invention, SLA has taken large steps equally in its machine design and resources used for it. SLA is real rapid modeling and is fast switching from rapid prototyping to rapid manufacturing. It can be an exceptionally convenient and valuable process in many conditions and for many industries. It has been used effectively to aid surgeons with ear implants and can be used in almost every industry from jewellery manufacturing to military, power, marine etc. This makes it the best part of rapid prototyping.

At EMS-USA we deliver 3d scanning, reverse engineering, and rapid prototyping service involving both on-site and off-site engagement models. Contact us for Stereolithography Services and other product and services we offer.

Article Source: http://EzineArticles.com/?expert=Jon_T_Smith

Initial Prototyping

3M began this phase by creating stereolithography (SLA) patterns with its in-house SLA equipment. Overflow SLA work was sourced to Vista Technologies. The SLA prototypes were used by engineers and industrial designers to check fit and form. The same prototypes were used by 3M packaging engineers to create conceptual mock-ups of product packaging. They also made excellent tools for ergonomic and usability studies.

To mimic the soft under pad of the sanding tool, Vista used PolyJet(TM) rapid prototyping technology. PolyJet was chosen because it can use either of two soft-durometer (a hardness measurement) materials that can be run to gain similar quality parts as SLA technology. TangoBlack, a material with a score of 61 on the Shore A durometer scale, was the best fit. Within days Vista was able to supply 3M with their simulated soft-durometer under pads for more testing.

The bottom pad for the hand sander was prototyped using TangoBlack material from the Polyjet technology. This material is a 61 Shore A material that mimics the properties of santoprene.

At the same time, a gripping/tensioning mechanism for the sanding media was being developed. At this point, the sub-assemblies were merged into a refined set of CAD databases. Additional SLA parts were created to evaluate the new mechanisms. With each new prototype, the team was able to investigate new features in the design. Because these rapid prototype parts could be created cost-effectively in a matter of hours instead of days or even weeks, the team had the ability to study complex forms and details in a manner not possible using traditional machining and fabrication techniques. In some cases multiple iterations were generated in one or two days.

On the left is the hand sander from the prototype tool and the hand sander on the right is from the production tool.

Second-Generation Rapid Prototypes: More Realistic Simulations
In the second generation of the prototypes, 3M needed the hinge function and material properties to be simulated more realistically. After a few design changes were made to the CAD data, Vista Technologies supplied 3M with a Fused Deposition Modeling (FDM) prototype.

The FDM part, made from extruded black ABS, allowed for more robust testing and provided similar specified material properties in weight and strength as the final part would have. This prototype was able to handle a variety of tests that allowed 3M to modify their design before production tooling was released.

Rapid Tooling Takes Over

Once 3M completed its work with prototypes, it was time for rapid tooling. Vista Technologies quickly created aluminum tools. Milled at 42,000 rpm with high-speed milling technology and a proprietary fixture system, these tools were made for quick turns and quick modifications.

A core and cavity of a 1+1 family tool of the hand sander top handle. The mold finish is as machined.

The aluminum tools could be modified, polished, textured, welded on, and were capable of shooting 10,000-plus parts. Vista Technologies supplied injection-molded parts within two to three weeks of usable CAD data. By getting specified material parts in hand, 3M could complete their required testing.

A computer rendering of the hand sander concept before prototyping.

The rapid tools supplied by Vista Technologies were for multiple parts that made up the sanding products. The parts were made in family tools–meaning several related parts were made in the same tool. By adding runner shut offs to the tools, 3M could turn on or turn off certain parts of the tool–thereby making only the parts they needed. This kept costs down while minimizing wasted material in extra mold inserts. The molds were made with hand pick-outs and manual slides to capture several undercuts in the part design.

3M chose the rapid tooling approach because it allowed them to quickly evaluate different part features and molding parameters. Tooling changes could be completed and parts resampled for evaluation in just a few days. This was a tremendous advantage to 3M.

From an engineering standpoint, they were able to sample several materials for strength and repetitive testing. They were also able to compare the functionality of various latch mechanisms and to check material flow and gate locations (points where material is injected into the tool).

A close-up of a production 3M hand sander. Many methods of rapid prototyping and rapid tooling were utilized before production tooling was released.

A 1+1 aluminum mold showing the handles molded in different colors for marketing review.

From a marketing standpoint, along with sampling different materials, they also were able to mold parts in a variety of colors to get important feedback from focus groups. By the time databases were released for production tooling, the mold designs had been optimized and the material and color strategies were in place.

By using rapid tooling, 3M discovered many things in the functional prototypes before cutting production tools. The gating was changed on the production tool, the snap-fit features were redesigned, the handle was modified and ultrasonic energy directors were added for sonic welding of parts in final assembly.

Summary

As rapid prototyping and rapid tooling technologies become more sophisticated, the importance of picking the correct technology for product applications can be critical to gaining a competitive edge. As 3M found, a combination of RP and RT technologies and materials helped them save money, speed development time and establish a foothold in the marketplace.

Owner of Mold Making Technology

Advisor to Rapid Tooling

Article Source: http://EzineArticles.com/?expert=Dan_Mishek