DIY Wire EDM

Posted in Uncategorized on February 8, 2010 by future man

Electrical discharge machining (EDM) is a process that involves cutting or deforming metal by expelling many hot sparks at a high rate of disbursement along a substrate. The sparks work to shave down layers of the metal until the proper cut has been accomplished. Wire or wire cut EDM employs a wire fed from a spool that is guided along the workpiece, usually while submerged in deionised water. As the wire travels over the workpiece, it rapidly emits the sparks to machine the substrate, while CNC controls guide it in two or more axes. Although a wire EDM machine may be capable of multiple-axis movement and control, the technique is not typically used for complex geometries, but rather holes, punches and simple tools. Because of the strength of EDM, the process can be used to machine pieces as thick as 300 mm.

Wire EDM is a complex process that requires an appropriate amount of space within which to properly operate. However, because of the process’s strengths, it has gained popularity in home shops and at the hobbyist level. Home wire EDM construction requires experience and patience, but can be accomplished and put to use to obtain desirable results.

How Wire EDM Works

A typical wire EDM system features a platform area for the workpiece to sit during machining, over which an arm hands like a gallows. The wire, usually copper or brass, is connected to this arm on wheels to control the wire feed’s speed. Because copper and brass can wear through quickly, the wire constantly unspools along the wire path. When the arm moves along the workpiece, it acts like string cutting clay, but instead of pressure, there is a spark discharge to cut the path. The most commonly used wire is 0.355 mm in width, but both smaller and larger wires are used for different jobs. Any cut made by wire EDM will be slightly larger than the wire’s width, because the sparks will discharge around the wire as it machines. Wire EDM also requires a dielectric fluid, often deionized water, to both control the spark disbursement and flush away debris that gathers as it is cut away from the workpiece. Special dielectric EDM-specific oil is available as well.

Homemade and DIY Wire EDM

Making a homemade wire EDM machine requires patience and safety. There are numerous websites and books that can aid in the process; professionals recommend The EDM Handbook by E. Bud Guitrau (ISBN 1569902429, Hanser Gardner Publications) and Build an EDM by Robert P. Langlois (ISBN 0941653528, Village Press).

There are a few things to keep in mind to avoid dangers or malfunctions before getting started. First, professionals agree that obtaining the kind of precision in a homemade wire EDM machine that is available at a machine shop is incredibly difficult, largely because of the level of adaptive controls relative to the machine. In higher end wire EDM machines, adaptive controls are capable of maintaining a steady rate of movement, factoring in the wire strength, voltage, and machine movement. Additionally, maintaining wire integrity and dielectric flush pressure is performed electronically in modern machines, and designing or implementing the older type of jockey pulley and weight systems used to do this can be difficult. If a wire loses proper tension, it can create abnormal cuts, while it can simply snap if it becomes too taut. Dielectric fluid pressure is important to guide the sparks and ensure safety.

Additionally, because a homemade wire EDM system is unlikely to be as electronically advanced as a newer machine shop system, operating the homemade system requires extra attention. There will be no electronic devices surveying tension, guidance and pattern, so the operator must be experienced to properly move the workpiece or table to properly cut the material. It is important to position the machine in such a way that these movements will be fluid and not hampered by other pieces of machinery.

More technical information is readily available from DIY EDM books and various websites.

Seven Keys to World Class Manufacturing

Posted in Uncategorized on January 26, 2010 by future man

What does it mean to be a world-class competitor? It means being successful in your chosen market against any competition—regardless of size, country of origin or resources. It means matching or exceeding any competitor on quality, lead time, flexibility, cost/price, customer service and innovation. It means picking your battles—competing where and when you choose and on terms that you dictate. It means you are in control and your competitors struggle to emulate your success.
What does it take to be world class? Richard Schonberger, a leading manufacturing consultant,
created the term “world-class manufacturing.” According to Schonberger, “manufacturing is gained
by marshalling the resources for continual rapid improvement.” To achieve world-class status,
companies must change procedures and concepts, which in turn leads to transforming relations among
suppliers, purchasers, producers and customers. Enterprise automation is indispensable to
manufacturing innovators who aim to gain market share, operate at peak efficiency and exceed
customer expectations so they can be world class in their industry.
How can your company become and remain world class? There are seven keys to becoming a world-class manufacturer that distill the broad concepts above into specific actions that can be addressed and accomplished in your company. Each is presented with a brief discussion and examples of its impact on a manufacturing organization and its competitiveness. A more detailed discussion of each of the seven keys is available from Infor.
The keys to success, in no particular order, are:
1 Reduce lead times
2 Speed time-to-market
3 Cut operations costs
4 Exceed customer expectations
5 Manage the global enterprise
6 Streamline outsourcing processes
7 Improve business performance visibility
Each of these objectives is important in and of itself; however, taken together, they describe the focus of the activities and attitudes that define world class.
Reduce Lead Times
Shorter lead times are always a good thing. In many markets, the ability to deliver sooner will win business away from competitors with similar product features, quality and price. In other markets, quick delivery can justify a premium price and will certainly enhance customer satisfaction. In all cases, shorter lead times increase flexibility and agility, reduce the need for inventory buffers and lowers obsolescence risk. Lead times are cumulative and bi-directional—that is, order handling, planning, procurement, inspection, manufacturing, handling, picking, packing, and delivery all contribute to the lead time; and the time it takes to get signals down the supply chain to initiate each activity adds to the overall time it takes to get the job done.
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Inflexible business rules and policies can drive undesired effects. Purchasing rules too focused on
unit cost lead to large quantity buys that result in high inventory and long lead times. Ironically, this type of buying can also lead to shortages, since longer lead times mean you will be making and buying to a less accurate forecast. The best combination of price and lead time often comes from a stable buyer-supplier collaborative relationship based on long-term contracts with deliveries according to a forecast that is shared with the supplier and updated frequently. The same is true on the customer side. Instead of focusing on securing large, one-time, single orders that clog up the supply
chain, companies must focus on creating long-term contracts with customers and sharing forecast
information with customers to reduce lead times.
The same issues concerning large lot sizes also apply to internally produced parts and products. Large lots, driven by a focus on lowest unit cost, raise inventory and lengthen lead times while reducing flexibility and responsiveness, increasing eventual cost through premium expediting instead of using large fixed lots, companies must dynamically adjust the lot size based on market demand, product mix and capacity. Ongoing continuous improvement efforts focused on reducing setup times can help companies reduce lot sizes, which provides flexibility in responding to market demand.
Appropriate measurements contribute to high performance on the plant floor. On-time shipment and
inventory turns are good examples of high-level measures that tie to company objectives. Focusing on
isolated measurements like equipment utilization on non-constraining resources encourages “busy work” that creates excess inventory and longer lead-times. Shop floor measurements must encourage overall performance—shipping orders on time at minimal total cost and minimal total cycle times.
Performing manual transactions often slows down the supply chain and adds to lead time. Reporting
transactions at each operation or creating a paper purchase order before suppliers work on a component are just two examples. In addition, manual transaction reporting often introduces errors and impacts work productivity. Companies must eliminate non-value added transactions and automate transactions to speed up the supply chain. For example, backflushing can be used on the shop floor, and supplier purchase orders can be electronically sent or completely eliminated using Supplier Relationship Management (SRM) solutions.
Cut Operations Costs
Although recent developments in planning and Customer Relationship Management (CRM) have focused more on top-line benefits—growing revenue—the bottom line is still greatly dependent on controlling costs. Companies with a lower operational cost structure enjoy an obvious advantage in profitability, and the ability to adjust pricing to meet competitive pressures if necessary, to maintain or gain market share.
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Costs are really just part of the scoreboard. When a company implements world-class operational
processes, it improves multiple measurements simultaneously, including cost, lead times, inventory
and customer service. This approach is superior to a pure cost reduction focus without associated business process change, which can negatively impact other operational measurements. Localized cost reduction efforts can often increase costs in other areas. Moving production overseas to an area with lower labor rates, for example, will increase costs for procurement, transportation, inventory and reduced flexibility, among others.
The relative cost of source/make/deliver, and therefore, the opportunities for cost reduction, will vary
with the specific industry and the kind of products the manufacturer makes. Most manufactured products today have relatively little direct labor content, generally less than 20% and often less than 10%, whereas the material content of most products is more than one-half the cost-of-goods sold (COGS). The rest is “overhead.” Since most direct labor costs tend to be fixed, effective deployment of these resources can reduce unplanned manufacturing overtime, premium expediting and outsourcing, as well as dramatically reduce cycle times. Since material cost is the dominant cost, significant opportunities for reduction lie in analyzing current spending and devising effective sourcing strategies for material. Overhead reduction is always a fertile area for cost reduction, using automation to streamline the procurement, manufacturing and customer management processes.
Additionally, fulfillment costs have not received as much attention as it deserves; inventory cost,
transportation, admin costs, electronic communications, and storage account for a significant
part of the cost of doing business. Fortunately, improving customer service can also generate cost
benefits at the same time. Improve business performance visibility Today’s fast-moving, ever-changing manufacturing environment demands faster responsiveness to changes in the market, product innovation and supply chain events. In this environment, ignorance is one of the greatest threats to a manufacturing company’s health and success. Executives and senior managers must understand how the enterprise is meeting strategic objectives. Middle-level managers need visibility into how they are performing against tactical objectives. Responsible individuals must be notified immediately when supply chain issues threaten the completion of objectives, so actions can be taken to ensure customer delivery and quality requirements continue to be met.
A well-implemented and effective business solution delivers overall visibility into the health of the company and its operations and provides detailed information for performance measurement, process
management, and problem identification and remediation. Such a system can help improve revenue
through competitive advantage, help you understand your business and therefore, manage it better, reduce operational costs, improve performance and improve results for all stakeholders—owners, executives, managers and employees.
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An enterprise business solution will capture literally thousands of pieces of information each day, as
activities are reported throughout the enterprise. All of this detailed data is of little use without placing it in context and seeing each activity in relationship with all the other activities and the overall plan. To turn data into meaningful information is an up-and-down process. Bits of data, taken together and summarized, form higher level contextual information that shows status, accomplishments and importance. From high-level summaries, the observer must be able to drill down to details to understand exactly what is happening and how to drive those activities toward the goals and objectives.
Management information and analysis is only as good as the data it is based on. Therefore, data must be collected as quickly as possible and with the least amount of human intervention, which tends to
introduce delays and errors. It is equally important to collect data from supply chain partners through
automation as much as possible. Electronic Data Interchange (EDI) is the most commonly used method today but EDI is rapidly being replaced by XML-based e-commerce communications and Web-based portal technologies.
All systems should be integrated so information can pass freely between them without manual re-entry.
Many manufacturers are left with “islands of automation” after implementation of specialized
information systems in isolated portions of the business over the years. While each contains valuable
information, absence of integration prevents the effective use of that information for overall
management and coordination of effort toward company objectives.
Speed Time-to-Market
Developing and introducing new products and services is vital to most manufacturing companies.
Good ideas are not enough; well-managed processes for bringing new products to market can lead to
significant competitive advantages. Those activities, however, represent a significant risk that can lead
either to missed opportunities or to huge financial losses.
In addition to new product development, the same processes and resources are applied to product
improvements, corrections and variations throughout the product lifecycle. Based on market research,
products are often subject to frequent engineering changes due to customer requests, technological
advances, regulatory concerns or competitive pressures.
Changes and improvements are easiest to make— and least costly and disruptive—earlier in the process. It is good business practice to collaborate with all operational areas of the business while the product and process are still being designed. Cooperation should be focused on the following areas: making sure the new product meets market needs (marketing and sales), that it is priced to sell and generate a profit (marketing and accounting), that it can be manufactured efficiently (production, production engineering, quality, purchasing and key suppliers), and that the product can be maintained and serviced (service).
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Because customer expectations are increasing, and competition is coming from new players around the
world, bringing better and less expensive products quickly to market is more crucial than ever. Research and development is a key success factor in a manufacturer’s survival and growth. Efficiency and responsiveness of R&D processes will impact the top line as well as the bottom line.
Customers are quick to compare and switch vendors. The Internet empowers buyers by providing fingertip access to many more suppliers around the globe; they can even customize products over the Internet without having to ask an engineer to quote their specific requirements. These capabilities change behaviors and expectations, and success in today’s markets can only be achieved through innovation, agility and aggressive marketing.
Exceed Customer Expectations
The ultimate goal in any business is pleasing your customers. The most successful companies don’t just meet customer expectations, they exceed them and beat the competition by setting the bar at a level that makes it difficult, if not impossible, for others to surpass. Successful manufacturers manage the entire customer relationship—from prospect to post-sales service and support—involving the entire organization in a customer focus. Whether or not they have direct contact with customers, contributors must keep the customers’ needs in mind as they plan and carry out day-to-day operations.
Manufacturers must truly understand the customers’ goals and objectives. Your products and services must strive to support the customers’ vision. Communication is very important; neglect is the number one reason that customers terminate a relationship. The key is to give customers access to all appropriate information about your relationship and make it readily available whenever and wherever they might need it—the Web is your ally in achieving this objective.
As most companies have painfully learned in recent years, customers often change their mind. To be fair, market conditions are such that product cycles and demand patterns are constantly changing. Agility is extremely important. A solid, collaborative partnership with customers will provide the most reliable advanced information and therefore the earliest warning of upcoming changes.
In short, the best strategy is to make the customer want to do business with you. Strive to be the
preferred supplier through competitive products, high quality, the right price and superior customer service.
Arguably, the most important aspect of customer service is on-time performance. There are two sides to on-time delivery: promising a realistic date; then delivering on that promise. You must take that promise seriously, meaning that it is not given lightly—all considerations and constraints are factored in before committing to a delivery date. Performance measurements are a must; if you don’t know how you are performing, you cannot improve upon it. It is not unusual for companies to consistently have 98% – 99% success in meeting agreed-to shipment dates.
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Quality must be considered a given. Work with your customers and engineering as early as possible in the product development cycle to determine the required measurements. Measuring and improving all
processes through the order and fulfillment cycles, with an eye toward continuous improvement, will
allow you to achieve or even surpass expectations.
Streamline Outsourcing Processes
Outsourcing of manufacturing operations is a common practice today because it offers flexibility—
the ability to change products or processes rapidly— and can often save money by exploiting economies of scale or other favorable cost factors offered by the contractor. There are two approaches to outsourcing: a single process step or group of steps may be performed by an outside resource (heat treating, for example, or electroplating) or the entire manufacturing process might be contracted to a third party. In either case, the manufacturer relieves demand on its own plants and can concentrate on its core competencies— which might not include volume manufacturing—while its partner(s) provide the resources for producing products.
Depending upon your current resources and circumstances, outsourcing a part of the manufacturing process could save you from having to expand your manufacturing space (perhaps even adding a new plant), searching for and hiring experienced resources, training the new hires and paying various expenses involved in ramping up a new production line or process. Capital assets can become a liability in a fast-changing marketplace. As customer demands and technologies change the nature and makeup of products, it can be an advantage to not be tied to a relatively inflexible physical plant.
For companies large and small, the goal is to become a world-class organization and to be able to compete in today’s global markets. For manufacturers, the fastest and easiest way to achieve this goal is through partnerships with companies that have attained superior capabilities in particular phases of the process—like production. By partnering with world class contract manufacturers, you can reap the benefits almost immediately—well-managed processes, high quality, on-time deliveries—and
increase your performance and expectations. At the same time, you can focus your own resources on the things that you do best—product innovation, design, marketing, distribution, sales or manufacturing.

CNC Snowboard Creation.

Posted in Uncategorized on January 21, 2010 by future man

Here is a CNC Project that is shot in a tutorial sequence. It goes from the Design, CAD, CAM, Control, CNC Plasma Cutting and then final assembly. Check out this CNC How-To to learn how to make a stomp pad for your snowboard. The complete project is on Youtube.
and a step by step guide on Instructables

Reprap Acrylic Extrusion

Posted in Uncategorized on January 7, 2010 by future man

[Nophead] started the year off by successfully extruding acrylic using a RepRap machine. The problem when working with this material is that when the hot ooze hits the cold air the printed material tends to warp, badly. [Nophead] raised the ambient air temperature around the part being extruded by replacing the bed of the RepRap machine with a heated aluminum plate.

We took at look at his build details for the hotbed. The plate itself is aluminum that he had milled by a machinist friend of his. It looks like the heat is produced by a network of power resistors bolted and soldered to the bottom of the plate. The original idea was to produce a controllable SMT soldering platform. Unfortunately this heating method doesn’t have the power needed to raise the temp quickly but that failure turned out to be a RepRap success.

Autodesk Virtual Conference

Posted in Uncategorized on January 5, 2010 by future man

Got this info today and thought it might be of interest

What if you could move beyond 3D? What if you could reduce product development costs? What if you could gain competitive advantage by optimizing your software tools? What if you could get to market faster and at less cost? Well, now you can.
You’re invited to the Go Beyond 3D to Digital Prototyping Virtual Event, coming direct to your desktop on January 27, 2010. It’s your FREE opportunity to interact with Autodesk® experts, watch live demos, network with your peers, download product information, and more – without ever leaving your office.
The more you actively participate in the virtual event, the greater your chances to also win one of ten iPod Touches!
Register Now                    
Come see the Autodesk Manufacturing portfolio and learn how Autodesk® Inventor® takes you beyond 3D to Digital Prototyping. Find out how to solve your design and workflow challenges, including how to:
Create a single digital model, thereby reducing your reliance on costly physical prototypes
Design, visualize and simulate products digitally, to compete more effectively, better service your clients, and do more in-house
Bridge the gaps that typically exist among conceptual design, engineering, manufacturing, and customers and suppliers
Virtual Event Agenda (times in PST)
9:00 – 9:30am: Design – Webcast
Autodesk® Inventor® Takes You Beyond 3D to Digital Prototyping
9:30 – 10:00am: Design – Webcast
AutoCAD® Mechanical and AutoCAD® Electrical
10:30 – 11:00am: Visualization – Webcasts
Autodesk® Inventor® Takes You Beyond 3D to Digital Prototyping
Autodesk® Showcase® for Visualization
Conceptual Design in Autodesk® Alias®
11:00 – 11:30am: Simulation – Webcasts
Autodesk® Inventor® Takes You Beyond 3D to Digital Prototyping
Autodesk® Algor® Simulation for FEA
Autodesk® Moldflow® for Plastics
11:30 – 12:00pm: Moderated Chats
Autodesk Inventor Product Suites
Who Needs Autodesk Showcase and Alias?
12:30 – 1:00pm: Moderated Chats
Moldflow and Algor Simulation Product Lines
Simulation Capabilities in Inventor
1:00 – 1:30pm: Industry Solutions – Webcasts
BIM for Building Products Manufacturing
Parts and Multi-CAD in Autodesk® Inventor LT™
Mechatronics in Inventor & AutoCAD Electrical
Data Management with Autodesk® Vault
1:30 – 2:00pm: Moderated Chats
BIM Exchange for Building Products
Who Needs Autodesk Inventor LT?
2:00 – 2:30pm: Moderated Chats
Interoperability: Inventor & AutoCAD Electrical
Autodesk Vault Product Line
By attending the Autodesk Go Beyond 3D to Digital Prototyping Virtual Event you could win one of ten iPod touches! Points will be awarded for your participation, so the more events you attend the greater the chances of winning. Details are posted on the event registration page.
Get it all without leaving your desk!
Register Now                    
Thank You,
The Autodesk Manufacturing Team

Knowedge Guide: Scrap Aluminum Recycling

Posted in knowledge guide with tags on January 4, 2010 by future man

Aluminum recycling and aluminum scrap recycling have developed into two distinct industries over the past several decades. Initially, the aluminum industry focused on producing large amounts of new metal aluminum products to reduce the overall price, thus becoming competitive with other materials and products. Over time, however, a secondary industry developed that focused on recycling the left-over scraps generated by primary aluminum products. Eventually, the secondary recycling industry began to focus on creating higher quality products from scrap aluminum, thus making recycled-material based products that could compete with new metal products, while new metal processes slowly moved toward collecting and recycling their process scraps.

Aluminum is extraordinarily light and corrosion resistant, making it one of the most widely used metals in various industries, including packaging, automotive, and construction. Additionally, it can easily be manipulated to produce differently shaped components, which has further enabled aluminum to be used in both small and large applications.

Recycling Aluminum

Recycled aluminum typically comes originates from one of two industries: municipal waste, such as waste generated from containers and packaging, and industrial scrap, such as sheets and films. Aluminum generated by these industries is often recycled and used to aid in the production of aluminum from bauxite. Other sources, such as waste generated by the transportation industry, (typically aluminum silicon or aluminum magnesium) and waste generated by electrical and construction applications, are used in the secondary aluminum recycling industry.

Before recycling, aluminum products are divided into two categories: aluminum by-products and aluminum scrap. Depending on the form of the aluminum, the recycling process will vary. First, the aluminum scrap must be sorted, which also involves several different processes.

When sorting scrap aluminum, any large components should be removed—electronic parts should be disassembled—and then passed along to recyclers. Aluminum beverage cans (abbreviated UBC for “used  beverage cans”) are sorted magnetically to weed out steel cans, then compacted with a baler—a device that employs three hydraulic rams—while smaller scrap is passed into a briquetter, which depends on rotating drums as a means of compression. Scrap is compressed to reduce the cost of shipping and make it easier to load the furnace.

Shredding is used in the case of large parts, such as aluminum from automotive applications. Hammer mills can shred very large components into easily sortable pieces, which can then be separated magnetically to sort the aluminum from other types of metal. Steel and iron can be sold to their appropriate mills, while the aluminum is further shredded and separated using different processes, such as heavy media separation, eddy current separation, and color sorting.

Despite the thorough sorting process, the metal content of aluminum is often difficult to discern. Therefore, the metal recovery (percentage of metal gained from the content of the scrap material) and the metal yield (percentage of metal gained from the mass of the scrap material) can vary. Sometimes the metal recovery is higher than the yield because of loss during melting or the presence of contaminants in the material. Typically, between 85-95 percent of metal can be recovered from the scrap.

For recycling used beverage cans and other forms of aluminum scrap, there are several furnaces that can be used. A reverberatory furnace is typically used for applications that contain at least 70 percent aluminum. Rotary furnaces, on the other hand, tend to function best with aluminum scrap that contains less than 70 percent aluminum. Sweat furnaces are effective in separating aluminum from iron, especially in composite components.