b'Give and Take to help minimize vibration.Asignificantportionofthe newer tools that were developing machine, he explained. He said theand bringing in have a variable-ge-toolmaker can provide specials inometry component to them, Wal-about six days for uncoated toolsther said.and eight days for coated ones. MacArthur said RobbJack intro-MacArthur said the most com- duced a geometry that eliminates mon helix angle for a rougher isvibration and chatter by matching from 35 to 40. That design also cantooth passing frequency to part be suitable for finishing, which tradi- frequency. Called Mirror Edge, it tionally requires a slightly higherachieves stable cutting conditions helix angle. RobbJack, for example,by combining polished flutes, var-offers a combination tool for hog- ious corner radii, through-cool-ging and finishing. ant capability and chipbreakers. In the old days, you would roughThe geometry also eradicates wit-with a two-flute tool and finish withness marks and staircase-shaped a three, he said. We have the abil- grooves when, for example, deep ity now with new geometry to hogpocketing and finishing deep walls, with three flutes and finish with thataccording to the company.same tool. However, RobbJack reports that A tool doesnt necessitate thespring passes, which are cuts taken same geometry for each flute, andon a wall a second time or more a variable helix and/or variable in- that follow the same toolpath, might dexing is a well-established designbe needed to improve finish and Balancing Technology Measuring and Tooling Technology Shrinking Technology Presetting TechnologyHAIMER Tool DynamicFor highest balancing grade, best surface finish and maximum tool life www.haimer-usa.com34JULY 2020Aluminum.indd 34 6/15/20 6:07 PM'