![]() 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. 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! Any help or advise would be appreciated, Thanks 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. ![]() I'm not a fan of the coolant, but there's no getting away from it. 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. (.0068 x of Thread Desired) Threads Per Inch 068 x 250. 4 ) / 147.06 = 1.796mm (.0707"), we're using a 1.8mm drill (.0709") TO ESTABLISH TAP DRILL SIZES FOR INCH SIZE ROLL FORMING TAPS TAP DRIIL SIZE Basic Tap 0.0. Desired thread size and of full thread are input parameters for the calculator. Calculations are done according to roll form tap drill charts which are given in the Machinerys Handbook. ![]() ( desired thread% x pitch ) / 147.06Įxample: (M2x.4) 2 - ( 75 x. Roll Form Tap Drill Chart Calculator for calculation of recommended roll form tap drill sizes for Unified threads. Using appropriate size solid carbide drills - 118° drill tipįormula for determining appropriate drill size for 75% metric threads: Tap O.D. 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. Trying a drill the next size up drops the thread percentage causing ripped threads at assembly. 5 holes in aluminum with 75% thread percentage. Material Hardness - Hardened materials over 30 HRC can be problematic when form tapping, is this case thread milling is recommended.Long time Forum reader, first time poster.We often use dedicated tapping fluid when possible vs. Cutting oils are generally preferred because of their lubricity compared to water soluble coolants. Lubricity - Forming taps require good lubrication.A combination of tap class of fit and pre tap hole size can be experimented with to find the perfect strategy. It is possible to enlarge a hole slightly if tap breakage is an issue, so long as the hole still gauges correctly. Select the closest drill size possible for the thread percentage desired. Pre Tap Hole Size - Reaming is always recommended.With form taps, the load is often less upon reversal. With cut taps, the point at which the tap reverses to retract is often the most critical. In our case, the correct tap drill would be the closest to 3.4 mm from below, and that is the 3.3 mm or 0.13-inch tap drill. ![]() Consistency - Tool load is consistent throughout the tapping operation. A rule of thumb is that the right tap drill is around 85 for coarse threads and 90 for fine threads which feature a higher number of threads per axial distance.Tool Life - Form taps can last multiple times longer than cut taps with the right recipe, there is simply less wear as the tap does not rely on sharp cutting edges.More Consistency - Without random chips smearing or wiping out threads accidently, form taps gauge more uniformly.Tap Strength - Form taps do not have conventional flutes which means the tap has more supporting material and rigidity vs.These benefits include improved thread finish, stronger threads, longer tap life, faster tapping speeds and no chips. This makes form tapping ideal for blind holes, especially in materials like copper and stainless steel. Jarflo roll form pipe taps (NPT & NPS) have significant advantages over cutting taps in many applications. Chipless Tapping - No chips are created when form tapping, the material is simply displaced into the thread shape.
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