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Thread Turning Technical Section
Thread Turning - Step by Step
Step 1 : Choose Thread Turning Method from page A04-5 Step 2 : Choose Insert
Step 3 : Choose Toolholder Step 4 : Choose Insert Grade Step 5 : Choose Thread Turning Speed Step 6 : Choose Number of Threading Passes
In most cases the above mentioned 6 steps would be the steps needed to ensure a good thread. When cutting more complicated threads such as TRAPEZ, ACME, BUTTRESS or SAGE, it is advisable to check the effect of the thread “HELIX ANGLE” on the “RESULTANT FLANK CLEARANCE” . If is smaller than 2 ° , an anvil change is required.
EXAMPLES: Example No. 1: Step 7 : Find Thread Helix Angle Step 8 : Choose Correct Anvil
Step 1:
Choose Thread Turning Method from page A04-5 Usually, an IN-RH Toolholder and Insert will be chosen, however, in this particular case we prefer to pull the metal chips while thread turning outward, thus we chose to work with IN-LH Insert & Toolholder Choose Insert from page A01-11: 16 IL 12 UN Choose Toolholder from page A02-8: SIL 0025 R16 Note: since we thread cut IN-RH thread outward with an IN-LH tool, do not forget to replace the standard anvil (supplied with the holder) with a negative anvil AE16-1.5 Choose Insert Grade from selection on page A04-2 Our choice for Brass is Grade K20 Choose Thread Turning Speed from chart on page A04-3, we chose 150 m/min Rotational Speed calculation: Choose Number of Threading passes from table on page A04-5, we chose 9 passes Choose Thread Turning Method from page A04-5, we chose EX - RH Insert & Toolholder Choose Insert from page A01-7: 16 ER 1.5 ISO Choose Toolholder from page A02-3: SER 2020 K16 Choose Insert Grade from selection on page A04-2 Our choice for Alloy Steel is Grade P25C Choose Thread Turning Speed from chart on page A04-3, we chose 100 m/min Rotational Speed calculation: Choose Number of Threading passes from table on page A04-5, we chose 8 passes 100 1000 30 1065 1254 150 38.1 1000
ISO
1.5 mm
Step 2: Step 3: Step 4:
Step 5:
Step 6:
Example No. 2:
Step 1:
Step 2: Step 3:
Step 4:
Step 5:
Step 6:
A04-8
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