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fig.1
5. OperatiOn
5.1.
Inserting drill bit Refer to fig.1
5.1.1.
refer to the point angle/drill overhang chart below and choose the correct angle for the material to be drilled.
5.1.2.
Place drill in trough. the amount that the drill point overhangs the lip rest is shown in the chart below for each point angle setting.
point angle
Overhang
88°
29.5mm
68°
50% diameter of drill bit
59°
50% diameter of drill bit
49°
100% diameter of drill bit
41°
As required
5.1.3.
Adjust the lip rest until it extends into the flute of the drill as shown in fig.2.
5.1.4.
move the rear bracket to support the end of the drill in this position.
5.1.5.
Tighten the clamp whilst keeping the drill flute against the lip rest see fig.3.
5.1.6.
the drill grinding attachment automatically sets the clearance angle of the drill point.
5.1.7.
ensure the grinder is switched off. loosen the mounting nut a little and move the slotted base towards the grinding wheel so that the
drill just touches the wheel.
5.1.8.
lock the base mounting nut. move the grinding attachment back and forth past the grinding wheel. if the pivot is too loose/stiff adjust
tension screws until the grinding attachment swings smoothly.
5.2.
sharpening
5.2.1.
feed the drill by small amounts.
5.2.2.
Turn grinder on and sharpen the first lip of the drill with short sweeps. Gradually advance the drill using the feed screw until the entire
surface is ground. the clamp should be loosened slightly whilst moving the drill forward then clamped to stop movement of the bit.
5.2.3.
to grind the second lip of the drill, move the grinding attachment away from the grinding wheel and only loosen the clamp.
5.2.4.
Rotate the drill until the opposite flute rests against the lip rest. Tighten clamp.
5.2.5.
turn grinder on and grind the second face with short sweeps as before.
this process ensures that the two cutting edges are the same length. switch the grinder off and remove drill from the grinding
attachment.
© Jack sealey limited
fig.2
Original Language Version
usage
Hard materials, thin sheet
small drill
General purpose drilling
soft materials (i.e. copper, Wood, Plastic)
countersinks
fig.3
1 clamp
2 trough
3 rear bracket
4 feed nut
5 lock nut
6 feed screw
7 Adjustable slide bracket
8 slotted base
9 mounting bolt/nut (not included)
10 Pivot pin
11 Angle adjusting nut
12 lip rest
13 tension screws
sms01 | issue:2 (4,5) 29/03/18
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