Drill-doctor XP Manuel d'utilisateur télécharger pdf (Page 8)

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Split Points

Split point drill bits prevent walk-around on the material

before they begin to cut.

This feature is described as self-centering. The need to

center punch is effectively eliminated. A standard drill bit

chisel point has to wear an area in the middle of the hole

to be drilled before the cutting edges will remove material.

Due to its additional cutting lips along the chisel edge, a

split point will begin cutting immediately. Up to 70% less

thrust (when compared to a non-split or conventional

point) is required to drill a hole with a split point.

Optional Step: Splitting the Point

Cause

The bit isn’t completely ground

yet.

Solution

Continue sharpening the bit until

the chisel is clean and straight.

If the machine quits removing

material before the chisel is

clean, re-align and sharpen again.

Problem

The Chisel Edge is not

clean or straight.

The entire surface from the Cut-

ting Edge to the Heel will have a

finely ground surface without

ridges or indentations. The Heel

will always be lower than the

Cutting Edge (positive relief).

Cause

Drill bit alignment.

Solution

Re-align the drill using the

Adjustable Alignment procedure

on page 18. To increase relief,

insert the Alignment Guide on

the Chuck closer to the (+) side of

the Alignment Port, then sharpen

the bit.

Problem

Insuffecient (negative)

relief or a slow cutting

drill bit.

Cause

Chuck is too loose or you are

using too much pressure when

sharpening.

Solution

Use more torque when tightening

the Chuck or less pressure when

sharpening. Clean the Chuck with

compressed air if the problem

persists.

Problem

Bit is backing out or

slipping out of the jaws

when you are sharpening.

Heel Cutting Edge

Leave bit in chuck after

sharpening

Always align and sharpen a

bit before splitting it. To split

the point, do not remove the

bit from the Chuck after

sharpening.

Align Guides

Align one of the Sharpening

Guides on the Chuck (short

white marks) with the Split-

ting Guide on the Splitting

Port. Port, making sure the

Alignment Guides insert into

the Split Point Guide

Rails in the Split-

ting Port.

Sharpening Guide

Split Point Guide Rails

Splitting Port

Splitting Guide

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Drill-doctor XP Manuel d'utilisateur Page 8

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