![]() We have tried anything in between S3555 and S300, thinking that might help. The recommended RPM for a Balax M2 is S3555. The speeds and feeds in this code are generic. So it is not just that individual mill that can't tap. HOLE SIZING (mm) WITH PROBABLE DRILL VOLUMES: 6H TOLERANCE RATING: 4H TOLERANCE GRADE: Thread. Additionally, most of the parts have M3 STI holes in them that we cut tap. These parts run in multiple locations throughout the shop. Some have may six M3 holes, some may have fifty eight M2 holes and eighteen M2.5 holes. This is a package of parts that gets assembled by our customer. So the breakage is likely related to the tap diameter. As the taps increase in size, the tap breakage is less often. Mostly we cut tap or thread mill on parts for other customers. M2, M2.5, and M3 are the only 3 form taps we are struggling with for this customer. Thanks everyone! A lot of great stuff here! Maybe there's something I just don't know about. Maybe there's something simple that I just haven't thought of. And some other off-brand, thick as molasses, tapping compound. We've tried Tap Magic for aluminum - comes in a red/white spray can and is supposed to be cinnamon scented. of tap drill (inches) tap drill size decimal equiv. limits (after tapping) tap drill size decimal equiv. I'm not a fan of the coolant, but there's no getting away from it. tap drill sizes sti (screw thread insert) taps sti tap size aluminum steel, plastic, magnesium minor dia. The coolant we use is a local brand I think, AFT (Advanced Fluid Technology) 619M2. We have purchased an Emuge Softsynchro high performance tap holder. Probably another 5 or 6 brands that I can't remember. Using appropriate size solid carbide drills - 118° drill tipįormula for determining appropriate drill size for 75% metric threads: Tap O.D. Spotting with a 1/4" x 120° NC spot drill Tapping retract is set at 4, but we've tried both slower and faster Torque specs for the assembly screws are mandated by our customer's customer.Ģ015 Haas VF-4SS. ![]() Form taps and thread percentage is mandated by our customer. To get the tap drill size in other depths, use our Tap Drill Size Calculator. You can learn more about thread depth in tapping here. Trying a drill the next size up drops the thread percentage causing ripped threads at assembly. If not specified, assume a thread depth of 75. 5 holes in aluminum with 75% thread percentage. * Values are calculated for Length of engagement of 5xPitch.Long time Forum reader, first time poster. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.3656 - 0.375 9.286 - 9.525 d 2 Pitch Diameter 0.3312 - 0.3344 8.412 - 8.494 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator * Values are calculated for Length of engagement of 5xPitch.
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