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5.1.11.
To install chuck (46) open the chuck jaws completely by turning the chuck key (46A) counter-clockwise. Hold chuck on spindle and tap
into
place on taper with a hammer (fig.7).
5.1.12. Loosen clamp screw on safety guard mounting collar, pass guard up over chuck and fit collar round flange of quill (40). Ensure guard pivot
is central and tighten clamp screw (see fig.8).
5.1.13. Open pulley cover (48), loosen butterfly set screw (36) on motor adjustment and fit belt (73) to pulleys(19/79). Pull motor (69) back to
tension belt and retighten screw (36).
5.2.
Drill mounting
WARNING! For stability and safety it is imperative that the drill base is securely bolted to the workbench (GDM790BR) or floor
p
(GDM1630FR).
5.2.1. Ensure that the mounting surface is capable of supporting the drill together with the weight of the heaviest likely workpiece.
fig.5
6.
OPERATION
WARNING! Ensure the drill is unplugged from the mains power supply before commencing.
p
6.1.
Installing drill bit
6.1.1.
Insert drill bit into chuck jaws to 1" (25mm) deep (avoid inserting small bits too far) and centre bit in chuck before tightening.
6.2.
Adjusting the table
6.2.1.
To adjust table up or down, loosen lock handle (fig.3.B) then turn bracket handle (fig.3.A). Once at correct height tighten lock handle
(fig.3.B).
6.2.2.
To adjust table tilt, loosen the work table bolt (fig.3.C), adjust table to the desired angle, then re-tighten bolt.
6.2.3.
To turn the table around the column, loosen the rack collar slightly, then loosen the lock handle (fig.3.B).
Turn the table to the desired position then secure the lock handle and rack collar.
6.3.
Adjusting the speed
NOTE: the belt cover is fitted with a micro-switch to prevent drill operation with the cover open.
6.3.1.
Open the pulley cover (48) and loosen the motor adjustment screw (36).
6.3.2.
Choose the speed for the drilling operation (see drill speed chart - Section 7) and move the belt to the correct pulley grooves
for that speed, as shown on the pulley chart - Section 7.
6.4.
Belt tension
6.4.1.
With the motor adjustment clamp screw (36) loose and using hand pressure on the motor, set tension so that belt give is no more
than 10mm each side, at centre span, under finger pressure. Tighten clamp screw (36).
6.5.
Positioning the workpiece
6.5.1.
Rest the workpiece on a piece of wood to to prevent the drill bit damaging the table when it breaks through the workpiece. The wood
should rest on the table so that one end of it is against the left side of the column. This will prevent the wood spinning when the drill
bit breaks through into it.
6.5.2.
For small workpieces that cannot be clamped to the table, use a drill vice (not included). Vice must be bolted to table.
6.6.
Setting the drill depth
6.6.1.
Use the scale on the side of the drill head near the drill handle.
6.6.2.
Loosen locking screw (36) and set the scale to the depth required. Tighten locking screw.
6.6.3.
When ready to drill, simply pull the feed handle. The drill will stop at the set depth.
6.7.
Setting the drill head
6.7.1.
Fore and aft movement
6.7.1.1. Loosen clamping lever (fig.9.A) and turn feed knob (fig.9.B) to move head to the required position. Re-tighten clamping lever.
6.7.2.
Horizontal rotation
6.7.2.1. Loosen clamping lever (fig.10.A) and rotate head on column to required position (360° rotation is available). Rep-tighten clamping
lever.
6.7.3.
Tilting
6.7.3.1. Loosen clamping lever (fig.9.A), Pull out and turn - to hold out - vertical lock (fig.10.B). Head may now be tilted up to 45° clockwise
and 90° anticlockwise. Angular position is shown by line (fig.9.C) against scale (fig.9.D). When set, re-tighten clamping lever.
After returning head to the vertical position always re-engage the vertical lock.
6.7.4.
Head square to table
6.7.4.1. Confirm that head is in the 'vertical' position, that the vertical lock (fig.10.B) is engaged and that the clamping lever (fig.9.A) is tight.
6.7.4.2. Using a spirit level check that table is horizontal and, if necessary, adjust as in para.6.2.2.
6.7.4.3. Clamp a straight rod, or a drill bit, in the chuck and use a machinist's square to check that the rod is perpendicular to the table.
Adjust drill head as necessary by loosening the two set screws (fig.11.A) either side of the spindle housing and rotating the housing
on the horizontal tube (81). When correctly positioned re-tighten set screws.
© Jack Sealey Limited
fig.6
fig.9
Original Language Version
fig.7
fig.10
fig.8
fig.11
GDM790BR,GDM1630FR Issue; 6(S) - 07/02/18
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