| PROBLÈME |
CAUSES |
SOLUTIONS |
| Expension
de trou |
-Rotation excentrique
du foret
-Force de prise insufisante |
-Vérifier le support
et/ou le remplacer
-Vérifier l'excentricité du mandrin |
-Angle de pointe
asymétrique
-Taille différente de lèvre
-Excentricité de l'arrete de coupe |
-Rectifier correctement
-Vérifier la précision après avoir
effectué la rectification. |
| PROBLÈME |
CAUSES |
SOLUTIONS |
| Dimension
irrégulière de trou |
-Arrete de pointe
asymétrique
-Hauteur de lèvre élever
-Usure importante de la dépouille |
-Rectifier correctement
-Vérifier la précision après avoir
effectué la rectification. |
-Excentricité
importante après fixation à la machine
-Force de prise insufisante
-Manque de rigidité du montage |
-Vérifier le support
et/ou le remplacer
-Vérifier l'excentricité du mandrin |
| -Vitesse d'avance
trop élevée |
-Diminuer la vitesse d'avance |
| Not enough lubrication |
Use drill with an oil hole |
| PROBLÈME |
CAUSES |
SOLUTIONS |
Inexactitude
de position
 |
Large run out
when attached to the machine
Large spindle run out |
Check holder and/or select
another one
Check run out after fixing to the chuck |
| Run out when cutting
material |
Select more rigid tool and
machine
Increase work clamping rigidity
Select a low cutting resistance thinning
Use centering
Work piece should be horizontal
Use a drill bush |
| HAUT
DE PAGE |
Low alignment accuracy (for
lathing) |
Check alignment |
| PROBLÈME |
CAUSES |
SOLUTIONS |
Perpendicularité
de trou
 |
Excessive tool
wear |
Regrind |
| Low position accuracy |
Increase position accuracy |
Non-symmetric
point angle
Large lip height
Run out of chisel edge |
Regrind correctly
Check precision after regrinding |
| Not enough drill
rigidity |
Increase drill rigidity |
Drilling surface
is not horizontal
Poor alignment (for lathing) |
Work piece must be horizontal
Make a center hole. Check alignment |
| PROBLÈME |
CAUSES |
SOLUTIONS |
Inexactitude
cylindrique
 |
Non-symmetric
point angle
Large lip height
Run out of chisel edge |
Regrind correctly
Check precision after regrinding |
Large run out
after attached to machine
Loose hold
Low work holding rigidity |
Check hole and/or select another
one
Check run out after fixing to the chuck |
| Relief angle is
too large |
Regrind correctly |
| Low drill rigidity |
Use carbide drill or larger
web drills |
| PROBLÈME |
CAUSES |
SOLUTIONS |
| Finition
de suface inadéquate |
Poor regrinding |
Take off all the wear |
Not suitable coolant
for the material
Not enough coolant |
Change supply method; increase
volume
Select higher coolant quality |
Large run out
after attached to machine
Loose hold |
Check holder and/or select
another one
Check run out after fixing to the chuck |
| Feed rate is too
high |
Reduce feed rate |
Excessive tool
wear
Build up on margin is too large |
Regrind correctly
Select a coated tool |
| HAUT
DE PAGE |
Chip packing |
Select suitable drill (wide
flute, high helix oil hole drill). Change cutting conditions
(feed rate or adopt step drilling) |
| PROBLÈME |
CAUSES |
SOLUTIONS |
Forme cylindrique
incorrecte
 |
Non-symmetric
point angle
Large lip height
Run out of chisel edge
Large margin wear |
Regrind correctly
Check precision after regrinding |
| Feed rate is too
low |
Increase the feed rate |
