Page 102 - Carmex - Metric Catalog 2021

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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.
Step 7 : Find Thread Helix Angle
Step 8 : Choose Correct Anvil

EXAMPLES:

Example No. 1:

Step 1: Choose Thread Turning Method ISO
from page A04-5, we chose EX - RH Insert & Toolholder
1.5 mm
Step 2: Choose Insert from page A01-7: 16 ER 1.5 ISO
Step 3: Choose Toolholder from page A02-3: SER 2020 K16 30mm

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 100 m/min
Rotational Speed calculation: 100 1000 1065
30
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 A02-8: 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

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 150 m/min
150 1000 1254
Rotational Speed calculation: 38.1
Step 6: Choose Number of Threading passes from table
on page A04-5, we chose 9 passes

A04-8