TECHNICAL TIP #29;
DRILLS; DRILLING ON INCLINED SURFACES:
Drilling on inclined or
curved surfaces can generally be accomplished by a reduction in feed. After the
drill tip has penetrated past the incline or curve then feed rate can return to
normal. Jobber length drills will need a greater reduction in feed than stub
length drills.
Incline
Stub Jobber
1°
0%
30%
2°
20%
40%
3°
35%
50%
4°
50%
6°
70%
Incline angles or curves more than 6° must be spot drilled or milled
flat.
Drills should be always have self-centering point geometry when used
on any irregular, inclined, or curved surface.
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You
can reach Kennametal-Greenfield Technical Support by phone at
1-888-GFI-TOOL, by fax at 1-888-GFI-FAXX or e-mail at
mailto:tech.support@gfii.com