Actual depth and size must be controlled by gaging. NOTE: If tapping idfficult to machine materials or using small taps, use a lower thread percentage such as 60 to 70. 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. Form taps are ideally suited for both blind & through holes. Roll Form Tap Drill Chart Calculator for calculation of recommended roll form tap drill sizes for Unified threads. Because no chip is produced, breakage due to chip packing and bird nesting is eliminated. 75 to 80 thread roughly equals 5/8 th of this maximum height. Forming Taps Forming taps, unlike cut taps that remove metal, work by compressing the work material to generate the desired thread. Email: Helvetica 8.00pt color:#FF0000)/CreationDate(D:20180302145305-05'00')/Rotate 0/Subj(Textbox)/T(khackney)/CA 1/BS/DA( 1 1 0 rg /Helvetica 8 Tf)/BE/Rect/Contents(For information call 180\rEmail: 0 obj The UN specification specifies that the common height of a thread should be 5/8 th of this maximum height.
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