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TECHNICAL INFORMATION
3.6. Troubleshooting guide for tapping
Problem: Tapping oversized threads (no-go gauge is too loose)
You used improper tap for material and thread application. You should use a suitable tap for hole type and material being
cutted according to the table in catalogue.
Cutting speed was too high. You should reduce cutting speed.
There was cold welding on the flanks of the tap. You should use more coolant/lubrication.
Chip packing in flutes occured. You should change your tool for new one.
Grinding burr occured. You should use coated tap.
Incorect fixturing or positioning of part. You should use more coolant/lubrication.
You should remove damaged teeth.
Inconsistent feed of tap.
You should use tap with another flute geometry.
Problem: Tapping oversized threads (no-go gauge is loose) There could be necessity of using set of taps .
The tolerance of used tap was too high comparing with required
class of the thread. Remove it with fiber brush.
Inapropriate reconditioning of a tap.
You should use tap holders with axial and parallel
compensation.
Try presicely fix cutted element.
You should control the feed while tapping.
You should check parameters of CNC machine (program).
Check lead screw for backlash.
You should use holder with compensation.
You should check marking on the tap and revise if it is suitable
for making required class of thread.
If you have any problems contact our Technical Representative.
While reconditioning it is required that all ground surfaces
maintain the original geometry put on by the manufacturer.
For instructive information please contact our Representative.
Problem: Tapping undersized threads (go gauge doesn’t enter part way into hole).
The chosen tap has not suitable geometry for multiple regrinds. You should limit the number of tap regrinds.
Try to use another tap.
A part of tap surface wasn’t renewed while resharpening.
Try to grind the tap again.
You used inapropriate tap for the tread being made and material You should use a new tap.
being cutted.
You should use tap suitable for the hole type and material being
cutted according to the table from catalogue.
The used tap has too small nominal size (tolerance). You should check marking on the tap and revise if it is suitable
for making required class of thread.
If you have any problems contact our Technical Representative.
Problem: Tapping bellmouthed hole (first few threads are oversized)
The tolerance of used tap was too high comparing with required You should check marking on the tap and revise if it is suitable
class of the thread. for making required class of thread.
If you have any problems contact our Technical Representative.
Inapropriate reconditioning of a tap. While reconditioning it is required that all ground surfaces
maintain the original geometry put on by the manufacturer.
For instructive information please contact our Representative.
Problem: Too low tap life Please read the table “torn and rough threads”
All reasons stated in next table “torn and rough threads”.
The tap lost its hardness by excess hear during regrinding. You should change the specification of the grinding wheel.
The loss of surface treatment occured after regrinding. You should use coolant while grinding.
Work hardened drill hole and hole chamfer.
Retreat surface of tap.
L. You should check suitability of surface treatment for material
being tapped.
You sholud frequently change or regrind tap drill.
You should check proper drilling speed and feed.
Please anneal part before tapping.
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