should now be adjusted to produce the overhang
required. (See table for overhang and Fig.2).
Tighten locking nut on slide bracket, raise the lip
stop and secure behind cutting edge of the drill and
tighten drill clamp. (Fig.3).
2. Unscrew butterfly nut on the base and move whole
unit until drill tip touches the grinding surface and
then secure.
3. Swing the attachment back and forth on the pivot
pin so that the drill tip just touches the grinder.
4. Start grinder and slowly swing attachment back and
forth, using the feed screw to achieve grinding.
5. Experience with use will tell you when an edge has
been ground. At this point turn off grinder, release
drill clamp screw and turn drill bit over to grind the
opposite angle. Tighten clamp and commence as
before.
To produce the best results, the attachment must be
situated in the right position in conjunction with your
bench grinder.With the varying designs in bench
grinders, either the bench grinder or the attachment
may have to be raised with packing.
The attachment must also be securely fixed with bolt
washers and butterfly nut in the slotted base, which
also helps with adjustment.
The attachment must be positioned so that it brings the
head of the trough to the face of the wheel (Fig.1).
Varying positions can be obtained with the aid of the
slotted base, pivot pin and adjusting nut, for setting the
drill angle.
Operating Instructions:
1. Unscrew drill clamp and lip stop just enough to allow
for the drill to be inserted into trough. At the same
time, release the locking nut and adjust the feed
screw on the slide bracket, allowing the drill to
protrude at the trough head. The feed screw nut
FIG.1
HEAD OF
TROUGH
LIP
STOP
DRILL
OVERHANG
DIMENSION
FIG.2
FIG.3
LIP RELIEF
ANGLE
8˚ TO 12˚
CUTTING
LIP ANGLE
Angle
Overhang
Usage
88˚
1.16"
Hard materials, thin sheet. Helps to prevent snatching.
68˚
Half drill diameter
Small drill for high volume production.
59˚
Half drill diameter
General purpose drilling.
49˚
Drill diameter
Soft materials, (plastic, wood, lead, copper, light alloy, etc.)
41˚
As required
Countersinks.
Drill angles obtainable and overhang required:
10751 Instructions 12/2/02 5:20 PM Page 3
