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Thread Turning Inserts Technical Section
Example No. 3:
Step 1: Choose Thread Turning Method from page 63 EX-RH. AMERICAN BUTTRESS
We chose EX-RH Insert & Toolholder. 12 TPI on 40 mm diameter.
Step 2: Choose Insert from page 33: 16 ER 12 ABUT Stainless Steel 304
Step 3: Choose Toolholder from page 39: SER 2525 M16
Step 4: Choose Insert Grade from selection on page 60
Our choice for Stainless Steel is Grade BMA
Step 5: Choose Thread Turning Speed from chart on page 61
We chose 120 m/min.
120 1000
Rotational Speed calculation: 954 RPM
40
Step 6: Choose Number of Threading passes
from table on page 63. We chose 13 passes Replacing the standard anvil
with an anvil with negative
angle will eliminate side rubbing
Step 7: Find Thread Helix Angle: on page 48
for Pitch of 12 TPI and 40 Diameter
Helix Angle as shown in the chart is 1
Step 8: Choose correct Anvil: As can be seen
from the chart on page 65, for AMERICAN
BUTTRESS Thread, for 12 TPI and 40 Diameter
a negative anvil AE16-1.5 should replace the
standard anvil supplied with the toolholder Anvil chosen:
AE16-1.5
Troubleshooting
Chipping Crater Wear Build-up Edge
1. Use a tougher carbide grade 1. Reduce cutting speed 1. Increase cutting speed
2. Eliminate tool overhang 2. Apply coolant fluid 2. Use a tougher carbide grade
3. Check if insert is correctly 3. Use a harder carbide grade
clamped
4. Eliminate vibration
Thermal Cracking Deformation Fracture
1. Reduce cutting speed 1. Use a harder carbide grade 1. Use a tougher carbide grade
2. Apply coolant fluid 2. Reduce cutting speed 2. Reduce depth of cut
3. Use a tougher carbide grade 3. Reduce depth of cut 3. Index insert sooner
4. Apply coolant fluid 4. Check machine and tool stability
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