Cutting Tool Shanks Improve Grip, Reduce Slippage : Modern Machine Shop

End Mills with gripping surfaces along the shank can prevent tool slippage and improve rigidity for aggressive roughing passes in aluminum machining. So many of us have lost parts from tools slipping out of their holders. The reassuring whir of chips being made gives way to a screech and a thud, and we jump into damage assessment, hoping that the part is salvageable and knowing that it likely is not. Tool slippage is becoming more and more common as feed rates that were unthinkable ten years ago become commonplace. Advanced cutting tools like the RobbJack end mill modeled here are capable of removing material at an incredible rate. However, toolholding also has to be up to the task if the user wishes to avoid tool slippage. Advanced machining technologies are drastically increasing feed rates for manufacturing, and this is especially prevalent in aluminum machining. The combination of more powerful machine tools and more aggressive machining strategies have pushed the material-removal rates towards levels that would have been unthinkable not long ago. Unfortunately, these high rates of material removal can put an enormous strain on the tooling. Even light metals such as aluminum...

Rancho Cucamonga steel mill cuts 110 jobs as it quits scrap metal, melting police-seized guns

Citing high costs and environmental regulations in California, a steel mill in Rancho Cucamonga is eliminating at least 100 jobs as it stops buying and processing scrap metal from outside sources. The change at Commercial Metals Co.’s Arrow Route factory also puts an end to its melting operation, which was one of the few remaining plants in California where law enforcement disposed of seized firearms. The facility will remain open and continue producing rebar for the construction industry made from steel shipped from other factories. But they will no longer buy and melt scrap metal, including guns confiscated from felons by police departments. One employee who received a layoff notice, speaking on a condition of anonymity because he feared retribution, said law enforcement agencies from as far away as Fresno dropped off guns on a regular basis, as did the police and sheriff’s departments from Los Angeles. Bill Russell, a spokesman from the Ontario Police Department, said they were looking for other ways to dispose of the weapons. “We know that there’s a place in Arizona that melts firearms, but that’s just not feasible for us,” Russell said. “We’re looking at alternatives.” Jodi...