![]() ![]() Material Hardness - Hardened materials over 30 HRC can be problematic when form tapping, is this case thread milling is recommended.* Permisable values for thread Class 4g # Description Value (mm) Value (Inch) es Allowance 0.032 (Ref) 0.0013 (Ref) d Major Diameter 11.818 - 11.968 0.4653 - 0.4712 d 2 Pitch Diameter 10.904 - 10.994 0.4293 - 0.4328 R Root Radius 0.188 (Min) 0.0074 (Min) C Root Truncation 0.188 - 0.342 0.0074 - 0.0135 LE Normal Length of Engagement 5.6 - 16 0.2205 - 0.6299.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. Consistency - Tool load is consistent throughout the tapping operation.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.This makes form tapping ideal for blind holes, especially in materials like copper and stainless steel. Chipless Tapping - No chips are created when form tapping, the material is simply displaced into the thread shape. ![]()
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