Tuesday, April 21, 2015

Greasing Your CNC Cutting System

We’re always talking about how to maximize the longevity of your CNC machine and consumables. Proper and timely maintenance is of course the easiest way to ensure you’re getting the biggest bang for your buck. Just as you would change the oil in your car or use WD40 on a squeaky door, adding grease to your CNC machine ensures it runs smoothly.

We recommend re-greasing your machine every month. There are 3 main areas for greasing: the bearing cars, the racks, and the ball screw (in most CNC models).

Bearing cars

Bearing cars can be found on either side of the x-axis gantry, y-axis, and z-axis. Using your grease gun, position the tip directly over the small ball inside the bearing car. Make sure you are compressing the ball. For a properly primed grease gun about 3 squeezes should do it. Wipe off any excess grease and repeat for all bearings.Greasing the bearing cars
On some older CNC machines the ball will not be directly accessible for the grease gun. Use the smaller attachable tips to compress the ball, and squeeze the grease inside.
Smaller attachment on grease gun

Racks

A light coat of grease is recommended for all of the racks. Lightly squeeze your grease gun as you move along the racks. Then use you finger to ensure the grease has gotten inside the teeth of the racks, as well as removing any excess grease. Remember only  a light coating of grease is needed; too much will just cause a mess and trap dirt and debris.Greasing the racks

 Ball-Screw

On most MultiCam models, a ball screw is used to move the Z-axis up and down. Same as the racks, use just a small amount of grease around the screw. Usually just using your finger is sufficient. Again, if you use too much grease you will be trapping too much dirt, which can be especially problematic around the ball-screw. You don’t want chips or debris flowing down the ball-screw as this can damage the ball nut. For our V-Series models, there isn’t a ball-screw. Instead there is another rack and pinion so you can follow the instructions above.

After 6 months we recommend a complete grease clean-up. Using a de-greasing agent, de-grease all bearing cars and racks, and then re-grease them. Why go through all this trouble? Grease is a lubricant but it also traps dirt and debris, which can eventually lead to build ups. Too often we get calls from customers about poor cut quality or cut chatter and the reason stemmed from a build-up of dirt. Save yourself a potentially expensive service call by instituting a semi-annual clean-up.
For the ball-screws however, do not use a de-greasing agent. Instead use another lubricant, like a torch lubricant in a plasma system. Lubricate the ball screw and then wipe everything clean with water, then re-apply the grease. We say this because it’s extremely important that chips and debris do not travel down into the ball nut. A de-greasing agent can do it’s job too well and debris will slip down into the ball nut. Dirt in the ball nut can cause binding which eventually results in a motor fault. If debris is stuck in the ball nut, the motor needs to work harder to move the Z-axis, drawing too much amperage, thus causing a fault.
We sell grease cartridge packages and grease guns. Just visit store.multicam.com and order yours today! Save yourself the hassle and expense of machine down time by just sticking to a proper greasing maintenance schedule.
Grease and grease gun pack

Thursday, April 2, 2015

Pro-Tip: MDF Spoilboards

We talk a lot of about spoilboards and sacrificial material, yet we still have customers encountering problems. Lately, we’ve had an increased number of customers call in about a lack of suction on their tables. There are a number of reasons why this could be happening. Perhaps the vacuum pump isn’t working correctly or the fittings aren’t secure. And yet the most common reason why a customer is experiencing a lack of suction? Their spoilboard.
We get that materials can be expensive and that picking up a piece of MDF at the lumber yard (or a piece that’s been lying around in your shop) is an inexpensive means of having a spoilboard. However, if you choose to use MDF you must TABLE MILL BOTH SIDES OF THE BOARD. This cannot be emphasized enough. MDF is created with a sealant, and this sealant prevents air from flowing properly through the board. If you do not route both sides of the board, air cannot pass through, and thus there will be a lack of suction on the piece you’d like to cut.
To create an MDF spoilboard, use a bit such as Onsrud’s 91-000 CT Spoilboard Cutter. If you’d like to use a material that doesn’t require the milling first, we recommend using LDF. LDF does not have the sealant that MDF has and its lower density means that air can more readily pass through, thus increasing your suction.
Onsrud 91-000 for MDF milling
So before you’re frantically calling your CNC support technician think, could the suction have anything to do with my spoilboard? By ensuring you’re using the correct spoilboard, you could save time, money on service calls, and headaches.

Monday, March 16, 2015

How to Increase Spindle Life

SpindlePM
Here is an excellent article by Lindsay Luminoso from the Canadian MetalWorking Magazine, offering expert advice on how to extend spindle life.
“Out of sight, out of mind.” When it comes to spindle maintenance, this adage is more common than not. However, when manufacturers take this approach, they can often find themselves with spindle failures that can be both costly to repair and cause downtime and lags in production.
Overlooking this critical component can spell disaster and affect the bottom line. When you purchase a car, you don’t simply drive it without understanding the specific features and needs of the vehicle. Why would you do the same with your CNC machine and its spindle? Many operators will turn on the machine and run it without really understanding the capabilities and limitations of the spindle. Adding small checks and scheduling preventive maintenance can ensure long spindle life and increase productivity.
The spindle really is the heart of the machine and is designed with the application and user specifications in mind. Regardless of what type of machine you are running, the spindle allows the machine to function.
“Typically, when someone purchases say for example, a large milling centre, the spindle is so buried, but it’s the heart of the machine. You can build the most rigid machine in the world but you have to have a good spindle motor in there,” says Gary Quirion, corporate president of GMN USA.
Because the spindle is often hidden, it is sometimes forgotten about when the operator does machine checks and worse, can be unknowingly pushed beyond capabilities.
This is why it is so important to understand the features and specification of this critical component. The onus is on the owners and operators to keep their spindles in good working condition in order to maintain longevity. End-users need an education on the [specifications] of the machine. It’s not just plug-and-play for all its life,” explains Alexandre Maurais, president of MEC PRECISION. Maintaining proper machining practices and inspection of parts can mean the difference between a seized spindle and a spindle that lasts.
“The spindle life can be infinite, but only if it doesn’t crash,” says Gus Gustafson, service manager for Thomas Skinner & Son Ltd. Crashes occur when the operator pushes the machine to do something that it isn’t normally supposed to do; this can cause the spindle to stall and halt operations.
Unfortunately, this is a common occurrence on the shop floor. The spindle life really depends on how the operator treats it and how they run the machine. “The spindle life really varies. They can last 10-15 years under normal use. But if someone crashes it on a regular basis, it could last only a year or less,” continues Gustafson.
SIGNS OF A PROBLEM
There are some clear indicators that your machine’s spindle is in need of inspection or repair. Obviously, if the machine is no longer rotating, this could mean that the spindle has failed. The spindle itself is a highly sensitive component with many intricate parts. Rotating parts like the chucks, drawbars, quills, rotors, shafts, etc., should be handled with care to ensure that they are never hit and jarred, which can cause serious damage to the overall spindle abilities. Tolerances for the rotating parts are so tight that even the smallest push can cause failure. However, a spindle may not stall entirely, but there are some factors that can point to a future spindle failure. “Old school, if it’s noisy, or if you have part finish issues, or the spindle is running hot, those are good indicators,” says Quirion.
The experts agree that uncharacteristic noise is one of the key signs that there is a problem. Monitoring the spindle from the install and confirming that there are no abnormal or different noises is one way to keep the spindle spinning, say Maurais.
Cracking, humming or banging noises should be a clear indication for the operator to contact the maintenance department or spindle repair service to diagnose the problem.
A part finish can easily determine a problem with the spindle. Oftentimes, you can clearly see if a part has too much or too little material removed, or the workpiece finish is not correct. Slight variances in the tolerances can cause a part to fail inspection, and if several parts are constantly failing to pass quality inspection, then this can point to a spindle problem. Temperature can also point to a significant problem. When the spindle runs hot, abnormally hot, the operator should stop running the machine before further damage is done. The complex interior components of a spindle can vary significantly depending on the manufacturer or application. However, if the spindle is running above the average temperature, this can be an early indicator of a future problem. There are many ways to measure the temperature, including spindle temperature sensors that are often placed at the top and the bottom of the spindle providing live temperature feedback. Gustafson says that another option for measuring spindle temperature is a heat gun. The operator can measure the temperature themselves and compare against baselines set at that facility.
TIPS FOR OPERATORS
Enhancing spindle life is a fine balance between proper care and proper understanding of this high-precision component. The operator should know the ins and outs of the spindle as well as the machining applications. For example, machining titanium with low speeds and heavy loads can put a lot of stress on a spindle, while light grinding applications and lower speeds can extend spindle life. A typical spindle is designed with the application in mind but the external design is very similar. Internal components, like the angle of the bearings, the number of bearings, the preload, etc., that are developed for each machining application. This is why it is very important to read the manual and specifications for the spindle, especially because the spindle is tucked away in the machine and most operators generally don’t access it.
One of the most important tips Quirion has for extending spindle life is be safe. “I’ve seen many things over the years. I always say read the manual. You’d be surprised how many people call and ask a question, and I ask, ‘Did you see the manual on page such and such?’ and they don’t even have a manual,” he explains.
Speaking to the spindle manufacturer before operation can ensure proper use of the spindle. The manufacturer can provide guidelines that you might not even be aware of. One of the first things the operator can do is run a spindle warm-up program every shift, says Gustafson. As previously mentioned, increased temperature is an indicator of spindle issues. Measuring the temperature the spindle runs at after the warm up cycle is important for establishing a baseline.
Once the baseline is set, the operator can determine normal function of the spindle. If it is running hot, “then you know it is pointing towards a problem,” he explains.
Checking the cooling system to make sure it’s functional is also important. Whether the spindle is cooled through compressed air, liquid, or fan, it is important to make sure that the cooling mechanisms are running smoothly. In most cases, grinding and milling spindles will be liquid cooled. If you are able, it is always a good idea to observe the temperature of the bearings on the front housing. Maurais also points out that there are quite a few spindles that have a positive pressure around the nose. “There is air that is blown all the time so the coolant doesn’t go near the spindle or bearings. The air will stop blowing if the airline is dirty or cracked. [This] will contaminate the bearings quickly and the spindle won’t last long. We are telling customers to watch [out for this]. Make sure there is pressure of air around the bearings at the spindle nose,” he continues.
Experts agree that you must use caution when working with longer tools, as they may alter the rotor dynamics if not careful. For example, Quirion explains, “a spindle might run 60,000 rpm as advertised, but if a long grinding quill is put in it, the speed will be limited. And if the [operator] exceeds that, twofold, you will damage the spindle, and it’s a safety factor and someone can be injured.”
Ensuring that you are using the proper toolholder and appropriate concentricity of the taper to meet the manufacturer’s specifications is key. The toolholder’s tapered shank must fit perfectly in the spindle taper every time it is inserted. “There should be 100 per cent surface contact of the toolholder,” explains Maurais. This will keep the tool on the centre line of the spindle and allow for accurate and proper use.
Examining the contact surface of the taper can also be helpful. You want the contact to be at 100 per cent. Cleaning the toolholders and spindle can help maintain precision and prolong the life of the spindle and ancillary tools. Chips and coolant can often get caught between the tool and the taper interface, damaging both the spindle and the tool holder. Spindle cleaners are quality control products that can be used regularly to remove residual particles that can affect machining capabilities.
Another way to prevent a spindle failure is by making sure the load on the controller is normal. In many cases, the spindle load condition can be defined for particular tools, whereby the machine stops if it reaches this limit. However, verifying the proper settings ensures that an overload won’t occur.
As mentioned, machining something like titanium with heavy loads can put a lot of stress on a spindle. Make sure the spindle is qualified to perform such operations.Spindle Preventive Maintenance
Proper care is really dictated by the type of spindle and application. For an oil-air system you have to make sure that all the settings are adjusted. Quirion explains, “You have to adjust the air and the oil flow rate. The drive unit has to be correct, the tool clamping for automatic tool change spindles have to be monitored, the tool retention should be checked and all the operating parameters with tool/without tool, those safeties should be checked.”
Day-to-day care can mean all the difference when it comes to spindle life. The operator should be aware of the spindle specifications and run the machine accordingly.
SCHEDULING PREVENTIVE MAINTENANCE
Aside from operator control, manufacturers can schedule Preventive Maintenance appointments with expert technicians who can come into the facility and run diagnostics on the spindles, providing data to allow for trending and extend general lifespan of the parts and spindle.
Experts agree that setting a Preventive Maintenance schedule at 3-, 6-, or 12-month intervals, can ensure spindle longevity.
There are many diagnostic tests that should be conducted on a regular basis. Having a thorough history or trending the machine and spindle function allows for manufacturers to plan ahead when it comes to a rebuild.
With Preventive Maintenance, “what we can do is tell you that ‘hey, your spindle probably has about six months left in it before it’s going to fail.’ And we can order the part and change it out for a customer before it even fails,” explains Gustafson. This allows for machine owners to anticipate future failures, which can be extremely costly, especially when it comes to unexpected breakdowns. Not all spindle manufacturers have all parts on the shelf and with new models, parts are not always readily available.
Preventive Maintenance tests can give a good indication when the spindle will need to be rebuilt, so parts can be pre-ordered, without expensive next-day delivery charges and production lags due to shipping times.
“The customers have a machine that cannot be down, cannot be in breakdown situations. The more we are able to prevent that, the more money everyone will make and the less emergency situations everyone will go through,” says Maurais.
There are 4-5 general Preventive Maintenance tests, including vibration test, checking the bearings, testing the pull force of the drawbar, and temperature checks.
Understanding how the spindle functions in the machine and the appropriate machining applications for the spindle can make all the difference when it comes to spindle longevity. Scheduling Preventive Maintenance appointments partnered with proper day-to-day operating techniques can ensure the spindle keeps on spinning for as long as you need.

Friday, February 6, 2015

EnRoute Workshop Schedule for 2015

EnRoute Workshop Schedule for 2015
To help with your carving and engraving needs, get more hands-on with EnRoute CNC router software and learn more about utilizing this program from SA International in special two-day workshops that will be conducted throughout this year at various locations:
• March 5-6: Phoenix, Arizona @ MultiCam Technology Center
• March 19-20: Atlanta, Georgia @ Madera Arts
• April 16-17: Dallas, Texas @ MultiCam Technology Center
• May 14-15: Chicago/Great Lakes @ MultiCam Technology Center
• September 16-18: Denver, Colorado ***VIP Event*** (Meet the EnRoute developers at this special 3 Day “EnRoute Pro” event. This will be a more advanced, three-day class focused on 3D surfacing, carving and texture creation specifically for the sign and woodworking industries.)
• October 8-9: Hackensack, New Jersey @ MultiCam Technology Center
• December 3-4: Anaheim, California @ MultiCam Technlogy Center
“The EnRoute workshop was worth every cent. The instructors patiently relayed, in detail, every aspect of EnRoute’s 2.5D, 3D, Rapid Texture techniques and the many other functions of Enroute,” says New York/New Jersey workshop attendee Henry. I am now able to take advantage of the tremendous features provided in the software.”
Bring your own computer and follow along on your PC with a demo version of EnRoute the workshop will provide. No key required. Here is the two-day class schedule:
Day 1, 8:30am - 5pm
Morning – It Never Hurts to Know the Basics
• EnRoute Concepts Review
• Toolpath Basics
• Nesting
• Output & Ordering
Afternoon – Advanced Toolpathing / Cutting
• Inlays
• 2-1/2 D
• Rough, Fine & Clean Tools
• Advanced Entry/Exit
• Day 1 Wrap-up and prepare for Day 2
Day 2, 8:30am - 5pm
Morning – Now for some Fun Surfaces
• 3D Surface Concepts
• Building a Relief
• Parametric Textures
Afternoon – EnRoute Rapid Texture
• Seed Contour, Objects as Seed Contours & 3D Reliefs with Rapid Texture
• Rapid Picture (Photo Cutting)
• Noise and Distortion
• Day 2 Wrap-up and Q & A
Space is limited, so register early to guarantee your seat. It’s $995 to attend a 2-day class or $1,295 to attend the EnRoute Pro 3-day class, but you save $200 when you register 30 days before the event. Attendees from 2014 save $300 when you register 30 days before the class.
To register, contact Terri Wright at 800/229-9066, ext. 114, or EnRouteSales@ThinkSAi.com.
For more machine and software training courses visit www.multicam.com/training.html

Friday, January 16, 2015

Realizable Capacity - How to get the most out of what you already have.

efficiency2
Original Author: Dick Kallage
Originally posted in Digital FABRICATOR, January 2015                                                                                                                                      
In his informative article The Capacity dilemma – Why today’s churning markets require a new viewpoint about capacity Mr. Kallage outlines an effective strategy to overcome capacity issues in the slow growth, churning market we are currently experiencing. We will bring you up to speed on the main points of the article, deliver Mr. Kallage’s solution and conclude with why we believe that MultiCam CNC machines naturally support the practical lean methodologies recommended in this article.
To begin Mr. Kallage discusses the characteristics of a churning market, which he defines as ‘one in which customers are restless, demanding more on service and pricing to offset the lack of revenue growth, and are willing to churn the supply base – change suppliers – to get what they want.’ This is an important concept to keep in mind, especially when considering capacity planning decisions.
When performing capacity planning it is critical to take into consideration the state of the market. Depending on whether we are in a slow growth churning market or one with steady growth, our capacity planning decisions can have very different consequences. Generally there will be some degree of error in any forecast, so we must decide if we want to set up our capacity so that it will be slightly greater than or less than what will be required to meet actual demand.
If we choose to play it safe and plan to have excess capacity then this will detract from our profits. On the other hand if we opt for having slightly less capacity than may be required, then the time it takes to meet customer orders will increase and our customers may become upset with the longer lead times.
Mr. Kallage says that in normal times with standard growth, businesses tend to gravitate towards having too little capacity. They can pocket the up-front savings from the lower amount invested in capacity and as long as the market isn’t in that slow growth churning state then customers will generally accept the longer lead times. However, given that we are in a churning market, it is very risky to assume customers will be content with this level of service.
Mr. Kallage also emphasizes that if customers do leave to seek suppliers with shorter lead times then it will likely be the major, large order customers, as they are the ones with the most power to obtain improved levels of service. He therefore concludes that in a slow growth churning market it is simply too risky not to choose the excess capacity route, also described as having a capacity buffer.
This brings us to the crux of the capacity dilemma. Do we risk losing key customers due to longer wait times because we opted for too little capacity? Or do we choose to go with excess capacity which could impede profits but would ensure customer satisfaction. Mr. Kallage says the solution can be found in the difference between realizable and absolute capacity and the utilization of practical lean methodologies to reduce this difference.
Now there could be a myriad of factors for why a company is operating at a level considerably beneath their absolute capacity potential, but listed below are the key culprits Mr. Kallage identified in the article.
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In order to combat these factors and improve efficiency Mr. Kallage recommends employing lean practices such as; ‘machine uptime monitoring, 5S and the visual workplace and any other practices that increase machine uptime, scheduling discipline, cross-training and information standardization’
If a company can adopt strategies to improve the utilization of the capacity they already have (thus decreasing the deficit between realizable and absolute capacity) then they can avoid having to settle for either of the tradeoffs we discussed above. By improving realizable capacity they can achieve the required capacity buffer (critical to reduce risk in the slow growth, churning market) without having to sacrifice profit margins investing in more capacity.
We believe that MultiCam’s products synergise extremely well with the strategy of adopting lean practices. The end goal of these practices is to improve realizable capacity by eliminating activities that result in unnecessary down time. MultiCam CNC Cutting Solutions inherently facilitate these improvements given the flexible and custom nature of their design. Every one of the MultiCam machines is built to order based on each customer’s unique manufacturing requirements.
One of the key culprits listed above is higher than expected machine or people downtime. Unlike some companies that simply assemble machines after outsourcing parts, MultiCam’s In-House Manufacturing ensures quality control through the manufacturing cycle. MultiCam also has more than 70 Local Technology Centers worldwide so our team of experts are set up to be in close proximity if a customer does require parts, maintenance or even programming assistance.
Another listed key culprit that could contribute to unnecessary downtime was employees’ variation in skills performance or attendance. MultiCam’s EZ Control system is the elegant solution to this common, yet serious productivity concern. Incorporating state-of-the-art CNC technology, it features an incredibly easy-to-use human-machine interface that allows companies to utilize their existing workforce. The controls hand-held interface eliminates the need for operators to be G-code literate; meaning any shop employee with a few minutes of training can operate a MultiCam machine. Flexibility is essential and not only is EZ Control a common part on all MultiCam machines; many of our standard parts are interchangeable.

Monday, December 29, 2014

4 Trends in Woodworking for 2015


Both Cabinet Maker FDM and Woodworking Network have come out with their predictions and trends to be on the lookout for in 2015. Here we present a few of these trends that are of particular interest:
Investments in New Technology
The president of the Cabinet Makers Association, Matt Krig, is expecting many woodworking shops to finally make the leap into new technologies, or to replace their aging equipment. “Most CMA members are optimistic,” he says. “A lot of guys bought a lot of things at the show (IWF) and are at the point of making significant investments (in new technology).” Not only are they projected to invest in capital equipment, but woodworkers are predicted to expand their product in knowledge in plastics and other non-wood products. The demand for mixed medium projects, especially in the housing market, is on the rise and shops are adapting.
With the increased popularity of cable networks such as HGTV, many customers are becoming more demanding when it comes to projects. They want shorter project times and lead times. Matt Krig also notes that there could also be a skilled labour shortage as those companies investing in technology require employees that are trained.
Lumber prices
Wood prices on the riseIn an interview with Cabinet Marker FDM, Gene Wengert, a wood technologist and a consultant to the woodworking industry, sees an interesting convergence of trends that will likely lead to higher lumber prices in the coming year. The lumber industry faces a shortage of sawmills and logging crews because many went out of business during the recession. “A third of them are gone,” says Wengert. But then there is another factor that most in the woodworking industry might not think about. “The big one is the tremendous need for railroad ties,” says Wengert.
He explains that the increase in domestic oil production fueled by shale oil development and fracking has increased the need for fuel transport by rail since there are not enough pipelines. That will increase the financial incentive for existing sawmills to saw more lower grades of lumber for railroad ties, which will create a shortage of those grades in the general lumber stream.
“The price will go up in all grades,” says Wengert. “We may have a 50 percent increase. We have to learn to be more efficient then we are now so we create less waste.” Companies will need to put more emphasis on how lumber is cut and graded, as well as confirming they are being supplied with the right grades and footages. “When you check grades and board footage, it’s amazing how often it is off,” he says.
5-axis routing5- Axis Routing
According to the Woodworking Network, the latest developments in advanced CNC machining centres have made 5-axis technology more accessible to the average woodworking shop. With the lines continuing to blur between CNC routers and CNC machining, 5-axis technology on a point-to-point router, for example, can give woodworkers the ability to manufacture high-precision and complex shapes and components. (If you’re interested in 5-axis, might we suggest checking out our 8000 Series Router).
Reshoring
As with many industries, reshoring activities in the woodworking and furniture making industries is estimated to continue. According to the Woodworking Network Almanac, 15% of new US manufacturing jobs between 2010 and 2013 were previously overseas. A stronger economy, the inflation of foreign currency, and a boom to the North American housing market have all contributed to companies choosing to manufacture on this continent, rather than look abroad.

Friday, December 5, 2014

MultiCam Celebrates 25th Anniversary


MultiCam Inc., a leading manufacturing of CNC cutting solutions, is pleased to announce that the end of 2014 will round out its first quarter century of operation. Since opening its doors in December of 1989, MultiCam's products have become an integral part of the manufacturing industry, advancing technology and value into systems that are highly productive, easy to use and built to last.

MultiCam Inc., originally Machine Automation Technology, was founded by Ken Koelling who began building complete CNC systems customized to the needs of his customers. His main goal was to ensure that every machine was engineered to perfection, built with passion and remained reliable for the life of the machine. He instilled a value equation into the company that ensured that the products built exceeded the industrial standards of the marketplace, yet remained affordable to small businesses around the globe.

Today, MultiCam has manufactured and installed more than 10,000 machines worldwide transforming Koelling's vision into a globally recognized, industry leader. "We continue to stand behind the goals and principles set forth 25 years ago," said Kelsey Smith, Marketing Director of MultiCam Inc. "Exemplary customer satisfaction, employee fulfillment and corporate citizenship remain the cornerstones of this company. Sustained success in these areas, we believe, will continue to yield long-term benefits for our brand, employees and our partners."