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Thread Turning Inserts Technical Section
Thread Turning - Step by Step
Step 1 : Choose Thread Turning Method from page 63
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.
Step 7 : Find Thread Helix Angle
Step 8 : Choose Correct Anvil
EXAMPLES:
Example No. 1:
Step 1: Choose Thread Turning Method ISO
from page 63, we chose EX - RH Insert & Toolholder
1.5 mm
Step 2: Choose Insert from page 9: 16 ER 1.5 ISO
30mm
Step 3: Choose Toolholder from page 39: SER 2020 K16
Step 4: Choose Insert Grade from selection on page 60
Our choice for Alloy Steel is Grade P25C
Step 5: Choose Thread Turning Speed from chart on page 61,
we chose 100 m/min
100 1000
Rotational Speed calculation: 1065
30
Step 6: Choose Number of Threading passes
from table on page 63, we chose 8 passes
Example No. 2:
Step 1: Choose Thread Turning Method from page 63
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
Step 2: Choose Insert from page 13: 16 IL 12 UN
Step 3: Choose Toolholder from page 41: 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
Step 4: Choose Insert Grade from selection on page 60
Our choice for Brass is Grade K20
Step 5: Choose Thread Turning Speed from chart on page 61,
we chose 150 m/min
150 1000 1254
Rotational Speed calculation: 38.1
Step 6: Choose Number of Threading passes from table
on page 63, we chose 9 passes
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