High-efficiency milling has been on the news for quite some time, and for all the good reasons. Right now, roughing cycle times using chamfer end mills can be reduced by as much as 80% when using strengthened tools and methods such as solid carbide and enhanced tool paths. Newer software and CAM systems even provide faster feed rates and deeper depths, while keeping temperature and chatter under control. However, we still encounter limitations when machining part features and areas that force us to be more conservative when it comes to cycle reduction.

Remember that the whole point of high-efficiency machining is to reduce cycle times and improve tool life. These mentioned obstacles can really hinder our ability to increase productivity, but there are ways to circumvent them.

Keep Chip Thickness Constant
Changing force loads on your cutter is one of the main causes of tool deterioration. Abrupt changes in material engagement cause sudden shocks and vibrations that increase tool fatigue. Part features, like pocket corners, tend to produce these sudden shocks and force us to be much more modest in our goals.

To solve this problem, you need to be able to dynamically calculate varying feed rates for crucial points of your toolpath so you can get close to keeping a constant cutting force for your tool and spindle. It sounds like a ton of work but newer CAMs provide incredible toolpath generation options that will help you take care of your carbide chamfer end mills.

Do Not Disengage
The same principle applies here. The longer you keep your tool engaged, the longer its lifespan. However, some parts will present features that create extensive areas of “air cutting”, such as bosses or islands, that will traditionally negate fluid toolpath engagement. The trick to achieving the highest percentage of cutter engagement time is to create trochoidal paths around these features to incorporate them into larger patterns on your piece.

Carbide Cutters
Carbide is the to-go material when you want to achieve high efficiency. It is harder than steel and can withstand extreme temperatures without losing material integrity. However, carbide is also very rigid and brittle. It can stand up to incredible compressive forces, yet be very sensitive to tensile forces. It means that carbide is not as flexible as steel and that the sharp edges of your carbide chamfer end mill can withstand elevated performance levels as long as it does not see tensile forces that can cause microchipping. This allows you to run the tool to its full depth of cut and spread the forces out over the whole area instead of localized points of your tip.

However, your carbide tools must be of the highest quality if you expect them to resist the full force of a full-depth cut at high feed rates. Online Carbide is a trusted all-American carbide tools supplier committed to providing the best tools for high-performance machining. Visit them today and take advantage of their direct manufacturing prices.

For those who are getting used to carbide tools, machining a piece with a spindle loaded with a high-speed steel drill mill feels like watching paint dry. Not to say that HSS does not have its uses. But today´s performance standards require manufacturers to churn out as many finished pieces as humanly possible.

Carbide end mills do offer outstanding performance, especially when combined with advanced toolpath strategies that newer CAM software now brings to the table. However, some tools require you to push them to the limit to get the best out of them.

TiAlN coated end mills, or titanium aluminum nitride tools can increase service life up to ten times longer than regular tools. The coating provides the tool with a protective shield against heat and oxidation. You can say that these tools are made for working at extremely high cutting speeds, and they excel at cutting hardened materials such as stainless steel and titanium alloys, even if you go dry on the material.

TiAlN coated end mills are incredibly hard, even more rigid than carbide. But the most interesting part is that the coating properties kick in when the tool runs hot. When it reaches certain temperatures, say from friction, a protective surface layer of Al2O3 or aluminum oxide ceramic is formed around the tool. The layer wears out and then reforms again in a continuous cycle, prolonging the life of the tool. It means that the tool performs best in high temperatures.

It is important to note that TiAlN coated high-speed steel tools do not hold well when operating for long periods. If you run a coated HSS twist drill on a stainless steel piece, the heat will eventually cause the tool to fail. Remember that while the coating is heat resistant, the core should also be able to withstand external conditions.

That is why it is better to use coated solid carbide cores when going through a lot of material if you want to avoid unnecessary downtime caused by tool failure. This is especially true when machining superalloys that push your tools through high cutting forces, abrasiveness, long chipping, and extreme temperatures. TiAlN coated end mills with a carbide core should be your go-to tools if you´re aiming at increased production and reduced downtime. Carbide holds better tolerances than steel tools, allowing you t5o take full advantage of your TiAlN coated end mills.

High-Performance machining has opened new opportunities for many shops to drastically increase their throughput levels several times above what was considered normal a few years ago. Of course, this would not be possible without enhanced machines and CAM software. But without modern cutting tools, advanced tooling strategies would have remained in the realm of theories.

A word about tool quality. While there has been an increased number of cutting tools manufacturers who offer carbide and coated drills and bits, not all of them offer a quality that allows you to accurately predict tool performance. If you want high-performance tools that comply with the highest quality standards, visit www.onlinecarbide.com.

Not My Match by Ilsa Madden-Mills

My rating: 5 of 5 stars


No good deed goes unpunished when dealing with matters of the heart. Giselle and Devon are the type of beautiful that drives emotions crazy. Mills gives the heart a reason to feel. The mind something to ponder and the senses a reason to burn. Not My Match is the purest form of breathless, beautiful, crazy heartache.

"We are focusing on catechols given that the animals use this type of chemistry so successfully," Wilker said. The natural glues might be designed to give way when the animals are hunted by predators, breaking off when pulled from a surface instead of causing injury to internal tissues.While most adhesives interact with water instead of sticking to China band sawmill Manufacturers surfaces, the catechol groups may have a special talent for "drilling down" through surface waters in order to bind onto surfaces, he said. The bio-based glue performed better than 10 commercial adhesives when used to bond polished aluminium. Proteins in the glue contain the amino acid DOPA, which harbours the chemistry needed to provide strength and adhesion.Mussels extend hair-like fibres that attach to surfaces using plaques of adhesive. In order to develop new materials able to bind within harsh environments, we made a biomimetic polymer that is modelled after the adhesive proteins of mussels," said Wilker.It was the only adhesive of those tested that worked with wood and far out-performed the other adhesives when used to join Teflon.Scientists, inspired by substances shellfish create to stick to surfaces, have developed a super strong adhesive that works under water. "These findings are helping to reveal which aspects of mussel adhesion are most important when managing attachment within their wet and salty environment," Wilker said. Researchers inserted this chemistry of mussel proteins into a biomimetic polymer called poly(catechol-styrene), creating an adhesive by harnessing the chemistry of compounds called catechols, which are contained in DOPA. "Mussels, barnacles, and oysters attach to rocks with apparent ease. "Poly(catechol-styrene) is looking to be, possibly, one of the strongest underwater adhesives found to date," he said. "All that is needed for high strength bonding underwater appears to be a catechol-containing polymer," he added..One explanation might be that the animals have evolved to produce adhesives that are only as strong as they need to be for their specific biological requirements. "Our current adhesives are terrible at wet bonding, yet marine biology solved this problem eons ago," said JonathanWilker, a professor at Purdue University in the US. "In biomimetics, where you try to make synthetic versions of natural materials and compounds, you almost never can achieve performance as good as the natural system," Wilker said. The new adhesive also proved to be about 17 times stronger than the natural adhesive produced by mussels. When compared with the five strongest commercial glues included in the study, the new adhesive performed better when bonding wood, Teflon and polished aluminium.

Mr Sethi received severe injuries and collapsed to the ground in pain while the accused fled from the crime scene."The victim was celebrating Lohri when the accused came there in a car. The family refused to do so that led to an argument between the accused and them. It later snowballed into a scuffle," the police said. He asked the victim and his family to remove the bonfire that was about to be lit for celebrating the festival. The police official said that 36-year-old victim, Ajay Sethi, associate producer of NDTV show Gustakhi Maaf and anchor-cum-actor in another show Chhupa Rustam, was busy in preparations for his newborn daughter’s first Lohri outside his in-laws’ residence when he was allegedly attacked by one of their neighbours identified as Sachin Bajaj, saw mills Manufacturers a real estate dealer.Later a PCR call was made and the victim was rushed to a nearby hospital where he is currently undergoing treatment. The police has lodged a case in this respect and is looking into the matter.A senior police official said that the incident happened at around 8 pm on January 13.An anchor-cum-actor of a news channel was severely injured during Lohri celebrations last week when a neighbour, reportedly in an inebriated condition, hit him with a piece of wood over a parking dispute in South Delhi’s Malviya Nagar.The victim’s family has alleged that the police was trying to shelter the accused and did not lodge case under relevant sections of IPC, but the police denied their allegations.The accused, in a fit of rage, picked up a large piece of wood lying nearby and thrashed the victim and also hit him on his face. The doctors attending to him said that he suffered multiple fractures and received 40 stitches.