Page 102 - Carmex - Inch Catalog 2022

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Thread Turning Inserts Technical Section

Thread Turning - Step by Step

Step 1 : Choose Thread Turning Method
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 UN
from page A04-5, we chose EX - RH Insert & Toolholder
16 TPI
Step 2: Choose Insert from page A01-11: 16 ER 16 UN
Step 3: Choose Toolholder from page A02-3: SER 0750 K16 1.25

Step 4: Choose Insert Grade from selection on page A04-2
Our choice for Alloy Steel is Grade P25C
Step 5: Choose Thread Turning Speed from chart on page A04-3,
we chose 330 ft/min
330 12
Rotational Speed calculation: 1.25 1008
Step 6: Choose Number of Threading passes
from table on page A04-5, we chose 8 passes
Example No. 2:

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

Step 2: Choose Insert from page A01-11: 16 IL 12 UN

Step 3: Choose Toolholder from page A02-7: SIL 1000 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 A04-2
Our choice for Brass is Grade K20

Step 5: Choose Thread Turning Speed from chart on page A04-3,
we chose 450 ft/min

Rotational Speed calculation: 450 12 1146
1.5
Step 6: Choose Number of Threading passes from table
on page A04-5, we chose 9 passes
A04-8