Woodworking machine

Shop Guide: Buying a Woodworking Bandsaw

When it comes to woodworking bandsaws, bigger is often desirable but not always better. Larger 16″ bands saws are less prone to vibration because of their mass, have greater power, and a larger cutting capacity. However, they cost more, are heavier to move, and take up more space in your shop. They can also be more intimidating for novice users. A 14″ saw is an excellent machine for the average home workshop, whether you are a novice woodworker or a dedicated hobbyist. It will do 95% of whatever is required, and ingenuity will take care of the other 5%.

 

There are quite a few 14″ models to choose from. Here are some things you need to keep in mind when you shop for a bandsaw.

 

Open or Closed Stand

All 14″ saws either sit on an open stand, or a closed, cabinet style stand. The closed stand will do a better job of keeping dust away from the motor, and it can provide a space for tool storage. However, an open stand is just as stable as a closed one.

 

Frame Style

Most saws will have a cast iron frame. Some of the newer models use welded steel frames, which are more often found on larger saws. Cast iron is a good choice. Avoid steel frames on a single cabinet, as the frames are simply not strong enough. Better saws have a second frame sandwich- welded to the first, and the best have a third frame and/or a lateral box-beam to provide the necessary support. The number of layers is easy to see and count, but make sure to compare the thickness of the sheet metal and to check the quality of the welds. Overall fit and finish is an indication of general quality, but a great paint job does not compensate for a weak frame.

 

Motor Size

Motor sizes range from ½ to 1 ½ HP. Smaller sized motors obviously have to work harder. However, the size of motor you will need depends upon the kind of work you are doing. For craft work and cutting primarily softwoods, a ½ to 1 HP should suffice. For furniture making or cabinet work opt for a 1 ½ HP. For occasional re-sawing, a slow feed rate and the right blade will do wonders.

 

Wheels

There are both top and bottom wheels. Opt for cast iron wheels over alloy wheels. The momentum their mass generates smoothes everything out and helps compensate for less than optimal power. The wheels will need to be aligned, which is an easy, but essential job (see Wheel Alignment sidebar). The wheels are usually spoked, and more spokes contribute to less vibration and smoother operation.

 

Trunnions

Trunnions are semi-circular brackets that support the table top and allow it to tilt. Big, strong, cast iron trunnions are far better than the flimsy pot metal (zinc alloy castings) on many, if not most, smaller saws. You are most likely to grab the table top when moving your saw, putting a lot of stress on the trunnions. Some saws may have heavy gauge steel trunnions, which would be preferable to pot metal.

 

Blade Guides and Thrust Bearings

As you push stock against the bandsaw blade, it flexes backward. A set of bearings, one above the table, the other below the table, counteract this movement. These are the thrust bearings. The blade also has a tendency to move sideways, particularly when you are cutting curves. Two sets of guide blocks, above and below the table, sandwich the blade, preventing lateral movement. Likely you’ll need to adjust both the bearings and guide blocks on a new saw. Doing so is very easy. Just position them so that they are a paper thickness from the blade. Also, position the blocks about 1/16″ behind the gullets on the blade.

 

The bearings and guides are usually made of metal. Many woodworkers replace their guides with ‘Cool Blocks’ a synthetic, graphite impregnated, phenolic laminate that helps extend the blade life and performance. You can also replace the metal bearings with ceramic bearings, which run cooler.

 

Cutting Speed

The optimal cutting speed for a woodworking bandsaw is about 3,500 feet per minute. While some saws offer a couple of speed rates, the slower speed doesn’t make enough difference on hardwoods, and isn’t slow enough for other than very light metalwork. In addition, changing the belt on these can be a nuisance.

 

Table Top

The table top should have a standard ¾” by ⅜” miter slot designed to accept commonly available gauges. Tables tend to be on the small size and many woodworkers build an auxiliary plywood table to provide a larger work surface.

 

Fence and Gauge

Few saws seem to come with a good quality fence and gauge. The fence must move easily and lock securely, offer at least modest adjustment for alignment to the band, and be easily removed. It should also be easy to true the fence, whether to the miter slot or blade. Fortunately there are good aftermarket replacements.

 

Blades

The three keys to straight tracking are a well-tuned saw, sufficient blade tension, and a blade that is reserved only for straight cuts. Cutting curves changes the set of the teeth and leaves the blade with a tendency to track to one side.

 

A ½” blade requires about 15,000 psi of tension, so the saw must possess the necessary frame and spring strength to provide and manage the tension. Many saws have a blade tension spring that is not nearly strong enough to handle the required tension. Good, inexpensive, after market replacements are readily available. Also keep in mind that while all bandsaws will have a tension knob to adjust blade tension, some lack a tension scale.

 

Blades are subject to considerable drag as they slice wood. Drag is caused by the hardness, thickness, and moisture content of the wood and by the width of the blade. The way to reduce drag is to get rid of the sawdust as fast and effectively as possible. Do that by choosing the correct tooth configuration, and by using the narrowest blade that is practical. A ½” 3 TPI hook tooth blade is an excellent choice for general purpose re-saws. It cuts quickly, but does make a wider kerf and leaves a rougher surface than blades with more teeth. Wider blades are more expensive, and require more horsepower and more tension than small saws can deliver, yet they do not produce any straighter cuts.

 

Parts Availability

Generic brand saws are almost always clones of the Delta saw. Delta parts are readily available and usually fit import saws. When I cracked the pot metal guide holder on my 20 year old Taiwanese copy I replaced it with a Delta guide holder and it fit perfectly.

 

Other Considerations

Look for high quality, easy to grasp metal handles, knobs, and catches rather than plastic. Not only are they nicer to use, they don’t break. The upper and lower doors should be hinged rather than bolted in place, and operate independently of each other. A brush fixed to the lower wheel that sweeps dust off the tire is a real bonus. So is a dust port, but only if it is well-placed – preferably on the back bottom of the saw. A magnetic switch is an important safety component, and a further indication of the quality of the whole unit. Most saws don’t come with a lamp, but it’s a good idea to attach one to your saw, particularly if you are making a lot of intricate and precise cuts.

 

Riser Blocks

You can easily increase the re-saw capacity of your saw by adding a riser block. An 18″ saw, for example, provides a 12″ re-saw capacity under the guides. Installing a riser block on a 14″ saw will give you the same 12″ resaw capability. The riser block is simply a rectangular piece of cast iron, about 6″ in height. It’s installed between the upper and lower cast iron arms of your bandsaw, effectively increasing the distance between the table and the blade guides. To reduce frustration make sure that the riser block you purchase is well machined. Otherwise the saw halves won’t line up without fiddling and fitting.

 

Wheel Alignment

It’s important that you align the upper and lower wheels of your band saw. All you’ll need is a straightedge (a straight length of hardwood will do). Start with your bandsaw unplugged. Open the wheel covers and place the straightedge against the outside edge of the bottom wheel (the edge facing you). The top edge of the top wheel should be kissing the straightedge – invariably it won’t. Loosen the nut that holds the blade tracking knob in place, and then turn the knob gently until the top wheel just touches the straightedge. Don’t forget to tighten the locking nut on the tracking knob when you’re done. Its good practice to check that the wheels are coplanar each time you change blades.

 

If you need more details or want to buy woodworking bandsaws, I recommend you to visit Boarke Machine Co., Ltd. – they are the professional woodworking machinery manufacturer in Taiwan. You can find various woodworking lathes and other machines there. To get more information of it, please do not hesitate to check out their website and feel free to contact with Boarke.

 

Article Source: https://www.canadianwoodworking.com/tools/buying-bandsaw

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A Shaper or A Router – Which Is Best For Your Shop?

Do you need a spindle shaper, or are a router and router table the better choice for your shop? Here are three expert opinions, courtesy of our friends at the Woodworker’s Journal:

 

Q:A woodworker wants to know if there is any real advantage to getting a spindle shaper. He wonders if there are any operations on a shaper that he can’t duplicate with a good router, router table and an Incra Jig.

 

A:(Michael Dresdner) “You can move the same amount of dirt with a 1/2-ton pickup truck as you can with a 2-ton pickup … it will just take more trips. A shaper typically has a much larger motor and spindle. It does the same thing but can take larger cuts — both in depth and height — in one pass. It also requires cutters that are, by and large, much more expensive than router bits. The prevailing issue will be the same as it always is when you decide how heavy-duty a tool you need: is the speed and durability worth the money?”

 

A:(Rick White) “The short answer is no. There’s very little a shaper can do that you can’t duplicate with a router table. Shapers are used more often in industrial woodworking shops, and I do almost all my machining of wood with a really good, well-built router table. The one thing a shaper has going for it is that it comes with a split fence, but you can build that into your router table design without much hassle.”

 

A:(Ian Kirby) “A good quality spindle shaper is preferable to a good quality router. The shaper is sturdier and should have a better fence, and will likely have more power and speed and flexibility. The most important thing is that it can be easily fitted with a power feeder, which is the key to getting the best results with most molding and shaping operations.”

 

Here’s our opinion: a shaper may be your best choice if millwork figures prominently in your woodworking – for example, you frequently find yourself  milling a couple hundred feet of molding. Or, a spindle shaper may be the best choice if you just like the idea of using a machine that’s designed to make exceptionally smooth profile cuts all day long, even in large stock. On the other hand, you can do a lot with a router and a router table. And there are some very sophisticated set-ups available – that’ll cover just about anything that all but the most industrious of us will ever need to do.

 

If you have any interest in learning more information about spindle shaper, come and visit Boarke Machine Co., Ltd. – the company specializes in kinds of woodworking machines. Get more details please contact Boarke at 886-4-25209798.

 

 

Article Source: http://www.rockler.com/how-to/a-shaper-or-a-router-which-is-best-for-your-shop/

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3 Must Have Woodworking Machines for Every Workshop

If you are an aspiring woodworker, who wants to take up woodworking professionally you should give ample thoughts to buying essential woodworking machines that you will need to carry out woodworking projects efficiently. Just like any other craft, woodworking begins with mastering the basic skills and knowledge to use the fundamental tools efficiently. Of course, a lot depends on the kind of projects you want to take up. But make sure that you invest in the essential woodworking machinery gradually. This way you will be able to assess if you really need a particular machine or not. As you gain more experience in the field, you will be able to find more specialized tools that allows you to do more things efficiently.

 

In this article we will not discuss about the basic hand tools that you will need to get started in woodworking, rather we will concentrate on choosing the power woodworking tools, which will take your woodworking experience to a whole new level. The first three woodworking machinery, that we would recommend any aspiring woodworker are: a table saw, a portable planer and a plunge router. With these, you will be able to carry out a number of tasks, right from milling, joinery and shaping.

 

These Three Different Pieces Of Woodworking Machinery Are Very Important:

 

  1. The Table Saw:

 

A table saw is at the heart of every woodworking workshop. There are several reasons why it has that coveted place among the woodworking machinery you have in the workshop– it not only allows great precision in ripping a stock in straight lines but is also useful in cutting it at various angles. It does the basic milling of a stock with ease and is well suited for joinery works.

 

When choosing a table saw, there are a number of factors that you need to consider. The first thing you need to understand is that – it is going to be one of the most used machinery in your workshop, so you must always buy a quality one. The work surface of the table saw should be rigid and strong, and should be able to sail through all types of projects. Ideally, you should buy one that has a handle to raise and lower the blade easily, and another handle that will enable you to adjust the angle of the blade. Another essential feature that it must have is the connection for dust collector. It should have powerful motor that will let you cut through hard wood and make deep cuts. The blades of the table saw are incredibly sharp, so they should come with a blade guard and a power switch that is within easy reach while working on it. Many table saw today come with a paddle switch that can be pressed with your knee or foot if you need to shut it down in an emergency.

 

  1. The Surface Planer:

 

A surface planer is another indispensable woodworking machinery to have in a woodworking workshop. It can help you to be incredibly creative in the work you do by smoothing any rough saw stock to your desired thickness. Gone are the days when a stock was hand planed tirelessly to get the designed thickness and smoothness, a surface planer can help you get the same result in a short time. Typically, a planer has a table of the dimension between 10” to 14” on which you can feed your stock. There are a set of blades that rotates, thereby cutting the wood as it is fed through it. You can adjust the depth of the cut b using the crank at one end of the planer.

 

Another important feature that you should consider having in your surface planer is a dust vacuum. This machine generates a lot of dust, so having a dust collection system in place with lengthen its life. This machine is quite noisy when it is at work, so always wear hearing protection when you are using it. If not used with care, it can be dangerous too. So, adhering to the safety precautions is of prime importance.

 

  1. The Router:

 

Every professional woodworking will have a router in his workshop. It is one of those wondrous pieces of woodworking machinery that can carry out a number of tasks for you – not only trimming and decorative edge treatments but also various joints like mortises, rabbets, and dadoes. By having a router in your workshop, you are adding versatility in your woodwork. By making use of patterns, you can create identical parts from wood.

 

A router makes use of various bits to produce a number of shapes. For beginners, a stationary base router is good enough. It will help you make cuts at a depth you make before making a cut. For advanced woodworkers, a plunge router can add a creative touch to the work. The plunge router bites into the wood, makes the cut and then allows you to lift it back. When choosing a router, choose one that is at least 2 HP or it won’t be powerful enough to carry out various tasks for you. You should also choose one that comes with variable speed. Collet size is another feature to consider. It is important if you want to use various bit sizes. It is important to remember that smaller bit can be put into larger collet size but not vice versa. The power should be within the reach of your fingers, and you should not need to take your hands off the router to switch it on or off.

 

Other than these 3 woodworking machinery, there are a few other power tools that you can consider buying. One is a good jigsaw. It is a very useful tool that can help you in varied tasks like cutting curves. When buying one look out for one that comes with blade guides as it will help in keeping the deflection of the blades to a minimum. Apart from that a handheld drill and a quality random orbit sander with a provision for dust collection are great power tools to have in your arsenal. Quality of these tools should always be of prime importance when choosing these tools and one should always remember to adhere to the safety norms while using them.

 

Learn more information about woodworking machines, try to visit TRUPRO-TEC: www.trupro-machine.com. The professional manufacturer of metalworking machines, woodworking machines, and metal forming machines etc.

 

 

Article Source: https://www.mikeswoodworkingprojects.com/3-must-woodworking-machinery-every-workshop/

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Telling You Some Basics of CNC Routers

A CNC router is an acronym for a computer numerically controlled router. This is a machine used in the manufacturing industry, mainly for cutting through materials like wood, metals and plastics. A router is special because it is controlled by software as opposed to mechanically by a human.

 

This is of interest to the manufacturing industry because it produces better results. You might wonder why that is, surely a human could do better work than a computer? The reason a router can work better than a mechanically controlled router is because the software that controls it allows it to move in a closer more detailed and steadier manner than a human ever could. This does not mean that there is never human intervention when it comes to the router, but what it means is that the movements are ultimately made by a computer, so are extremely accurate and detailed and the machine can move the tiniest amount if that is what is needed. This is why CNC routers improve manufacturing. They can also work continuously whereas a human would have to take a break and results would get lower in quality the longer they continue, due to fatigue.

 

A CNC router looks somewhat like a table top work station that operates on its own. Parts that a CNC router has include a cutting tool, a control panel, a worktop and, naturally, a router. There are many other parts that also make up this fascinating CNC machine.

 

CNC routers take a lot of skill to make. That is because the person or team that produces one needs skills from varying fields. That is they need to be able to design the machine to start with. Then they need to be able to source the parts and be able to assemble it from scratch in a safe manner. IT and programming skills also need to be thrown into the mix in order to create the software that the machine runs on. So, as you can see there really is a broad range of talents required to create a CNC router; it is certainly not an easy task.

 

If you need to use a router there are a few different ways of taking advantage of one. The best option is to go with a CNC machining provider. These firms have CNC routers that are ready to be used and can be programmed to match your productions needs. They are especially useful if you only need to manufacture a small amount, or a certain part. They also provide a team of experts with the broad range of talents mentioned above who can assist and advise you with your production.

 

There is also the option of building a CNC router. This will require a lot of skill but it is certainly possible to build a basic one and it can be a fun task if CNC machinery is a hobby of yours.

 

TRUPRO-TEC Industrial Co., Ltd. is the company of specializing in kinds of metalworking machines and woodworking machines. CNC router is one of excellent machinery manufactured by them. If you need further details about CNC router series, welcome to visit their website and feel free to contact with Trupro-Tec.

 

 

Article Source: http://EzineArticles.com/9158638

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Considerations for Buying a Used Belt Sander

Sanding is ubiquitous to woodworking. But the type and level of woodworking that you perform can greatly affect your sanding needs. If you plan to pursue woodworking as a hobby or as a small side business, an electrical handheld sander or even a manual sander may suit your needs. But if you want to pursue woodworking as a business and gradually increase your production, there will come a time when you need to purchase a wide belt sander. Unlike smaller sanders that are used to refine the surface of already sanded wood, belt sanders are used to remove a significant amount of material in a short period of time, making them essential for sanding rough wood stock in a high production atmosphere. Although acquiring an industrial grade wide belt sander is essential for high scale production, purchasing it can require a significant amount of money; that is, unless you purchase a used wide belt sander.

 

Although anyone would be skeptical about starting a new woodworking business with used machines, used industrial woodworking machines aren’t your average used machines. In addition to usually having a significant amount of their lifespan still ahead of them, they’re also designed to stand up to commercial level woodworking. When you buy used woodworking machines that have been well maintained by their previous owners, you can count on receiving machinery that performs like new. However, as you shop for a used wide belt sander, you’ll need to make some considerations in addition to how well the sander has been maintained, including: the width of the sander’s platen, its speed and how much vibration it produces.

 

If you’re buying an industrial grade wide belt sander that sits on the floor, the width of its platen isn’t of much concern. A belt sander’s platen is the flat part of its bottom section that sits against the floor or a table surface. While floor sanders are generally so heavy that nothing tips them over and are sometimes bolted to the floor, table sanders, depending on their weight, are recommended to have a platen that is one inch wider than the width of the sanding belt in the event that they tip over. Regardless of whether platen width is a concern with the belt sander that you buy, the speed with which its belt turns will be. Some sanders come with one-speed settings and other with variable settings, with the one-speed sanders usually intended for wood sanding only. If you’ll only be sanding wood, a single speed sander should work fine. But if you plan on sanding metal or plastic material as well, you’ll need a sander with various speed settings.

 

The last major concern when shopping for a belt sander is how much vibration it produces. Generally, sanders that sit on the floor don’t experience much vibration. But table sanders can be another story. To minimize vibration in a table sander, woodworking experts generally recommend buying a lighter table model instead of a heavier one. Although a little vibration might not sound like much of a problem, it can cause chatter marks in your wood stock, which is something that you can’t afford in terms either time or money.

 

Trupro has been in the sander industry for more than two decades. We provide wide range of sanding machines from light to heavy duty, for metal working to woodworking. With our extensive experience and know-how, our wide belt sanders have been recognized as the top quality and best selection for carpentry projects. If you have any question regarding our wide belt sanders or other products, please feel free to let Trupro know.

 

 

Article Source: http://EzineArticles.com/4010490

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The Right Way to Get a Dust Collector

In almost every woodworking functions, wood dust or saw dust is really a possible trouble. These types of wood particles or wood debris will be risky since they will produce really serious health worries and pose as likely fire risks. For you to fight off this matter, employing a dust extractor is vital. Commercial or heavy duty dust extractors are made to assist take away any of these airborne contaminants at its very origin.

 

You can find 3 considerations you might want to make when choosing the right piece of equipment or designing the right one for the shop. One, you should find out the amount of cubic feet per minute of air activity is necessary inside the system to deal with the dust production. Two, consider the makeup and build of the dust collector so that it may supply the best demands that you’ll require. Three, identify whether you will need a single or dual stage collection unit.

 

Some individuals, however, implement inferior vacuums while some will not use dust extraction devices whatsoever. Generally, the common vacuums that are supposed to collect dust are the ones that harbor the hazardous dust debris. In order to be safe, it is advisable to basically employ a reliable dust extractor.

 

If you’d like a highly effective filtration product, you need to ensure that the dust bag or filter systems will be properly sifting through the dust particles. Filters possess diverse capabilities, so you will need to decide how little a filtration system can sort through. Many of the best filters will sort through debris at 1 to.03 microns.

 

Uncover whether you’ll require a pair of filters or a single one would probably do. You will find tinier particles leads to a lot more problems to your health. Moreover, look at how dust collector units generate electric charges in order to ground it using copper wire and ward off a spark from igniting.

 

With over 20 years of experience in the woodworking field, TRUPRO-TEC has developed a series of dust collectors and air filtration products available in different power capacities. The special designs of Industrial motor and blower impeller make our products achieve maximum performance.

 

Durability, reliability and high efficiency are the reasons why our products are hot sales. We are always committed to ongoing innovation and make us a leader in the field of wood dust collectors. You can count on us for the products and advice you need. Welcome to visit the website of TRUPRO-TEC and feel free to contact us for more info about dust collectors.

 

Article Source: http://EzineArticles.com/3935776

 

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6 Key Factors to Consider When Buying Drum Sanders

Drum sanders are powerful and versatile in that they can be used as floor sander or bench sander among other uses. The market has a wide variety of models and brands and this means you would need to be a little careful when making your choice so that you can get a good drum sander for your use.

 

  1. Quality

 

The quality of the drum sander cannot be ignored because it directly affects functionality and durability. The ones made from alloys tend to be quite durable and make great investments. Look at the materials used and make sure you get yours from a distributor you can trust with quality brands and models.

 

  1. Speed

 

A good drum sander should have a speed that is easy to control. Variable speeds are very important because not all uses can use just one speed, hence you are better equipped if you can adjust the speed to match the use. High speeds are great for more polishing but other applications achieve best results with slow or moderate speed.

 

  1. Platen

 

This is the recumbent part on the tool’s lowest part. Your drum sander should have a platen that is constructed to withstand friction and vibration of daily normal operations. Platen that measures around an inch wider than the drum in terms of width definitely makes a great choice.

 

  1. Drum

 

The drum is a very important part of the machine and should therefore be made from good materials. Aluminum that has self-cooling abilities is, for instance a very good material for the drum. This is because the cooling prevents heat damage to the sanding strip or wood under load. A unit that also has drum height that is adjustable is a good machine because it gives you more flexibility in using for various purposes.

 

  1. Dust collection

 

A machine that has a dust collection feature included is a good drum sander. The dust system helps in keeping the tool clean and safe in operation and also keeps dust from the hair and clothes of the drum sander operator. It is actually possible to find one that has a detachable vacuum system designed to make it more effective.

 

  1. Noise

 

Most drum sanders operate under distracting noise levels, but technological developments have made it possible to manufacture machines that have noise reduction features. A machine that has 95 decibels is considered to have non-harmful noise so be sure to check. Always look at the noise reduction features or noise levels before you go ahead and make your purchase.

 

Another important thing to consider when looking for a good sander is the levels of vibration. Important to remember is that excessive vibration can leave blabber marks on your stock or worse still it can lead to carpal tunnel syndrome. When buying, remember the weight can determine the levels of vibration with lighter drum sanders causing less vibration. You can also choose a model that has an anti-vibration design for safer and excellent operations.

 

If you need further details about drum sander and other woodworking machines, welcome to visit our website and feel free to contact TRUPRO – the professional and high quality woodworking machine manufacturer.

 

 

Article Source: http://EzineArticles.com/expert/Phanuwat_Phonphet/1861608

 

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Safety Regarding Magnetic Workholding

Resistance to the implementation of magnetic work holding usually begins with a concern for safety. These concerns can be allayed by assessing the technology, holding power and optimal operating conditions of magnetic work holding in terms of operational safety.

 

Despite the competitive benefits of magnetic workholding in reducing costs and improving productivity, there still exists a resistance to the implementation of magnetic technology as the primary work holder in machining operations. This resistance usually begins with a concern for safety. By assessing the technology, holding power and optimal operating conditions of magnetic work holding relative to operational safety, these concerns can be allayed.

 

Magnetic Work Holding as a Safe Technology

If a machine operator has held workpieces with mechanical clamps for decades, the idea of relying on magnetism to hold workpieces, especially in heavy milling operations, boils down to an issue of trust: Is this really safe? While understandable this opinion is rooted in subjectivity not objective fact. More than likely, those who hold this point of view may not fully understand the facts of how safe magnetic work holding is.

 

So, how can magnetic work holding be considered as a safe technology? By definition, it produces a uniform, consistent, and infinite holding power that does not relax, give, or decrease until an operator de-energizes it.

 

In general, magnetic work holders are constructed with an array of individual magnets embedded into a magnetic chuck or plate. Each magnet has a north and south pole across which flows magnetic energy called flux. When a workpiece is placed across the poles of these magnets, flux flows into it. When placed in this flux field, a magnetic field of opposite polarity is induced into the workpiece thereby creating a magnetic attraction between the chuck and the workpiece. This attraction will remain consistent, uniform, infinite, and reliable as long as the magnetic field is energized. This reliability makes magnetic workholding a truly safe technology.

 

Magnetic Work Holding as a Safe Holding Force

Holding power or strength is another factor considered when forming an opinion about the safety of magnetic workholding. If an operator does not know how strong magnetic workholding is, he may mistakenly believe magnetic technology is not strong enough to do the job safely. This opinion can be allayed by two facts:

(1) magnetic workholdings can have a clamping power up to 1000 daN and

(2) depending upon the application, an instantaneous clamping force of 12 tons per square foot can be generated by magnetic workholders. This level of holding force is more than comparable to mechanical clamps with one additional advantage: magnetic holding force is uniform, constant and infinite until the operator de-energizes it.

 

Optimal Operating Conditions

To implement magnetic work holding solutions may require some training to understand the technology’s optimal operating conditions. For example, magnetic work holding is best used with smooth-surfaced workpieces rather than rough ones because the smoothness decreases the air gap between the workpiece and the magnet; small air gaps increase magnetic attraction and the holding bond. Some materials are better conductors of magnetism than others. For example, annealed materials are ideal while hardened materials don’t absorb flux as easily and will retain some magnetism. This condition can be corrected within seconds with demagnetization. Finally, the direction of the holding force is yet another adjustment an operator may have to make to safely implement magnetic work holding. All magnets have 100 percent clamping force directly away from the face of the magnet, but only about 20 percent clamping force against side forces. So, the geometry of a cut must be considered in the machining process to reap the advantages of this type of workholding.

 

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

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