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12.3 Ploughing/
Grooving
'
Flat grourf«U>acUr>read
V-
Premium
ado Head
Fig. 47
12.4 Disc Sanding
Note: In this upright position, however, it is essential
that the Dado Head is covered by the standard
sawblade guard (with the riving knife assembly
removed) and no/the Shaping Head guard.
With repeated passes, the ordinary saw blade will often cut
grooves adequately. When a wider groove is needed a
Dado Head is more appropriate (Fig. 46). It is also ideal for
cutting rebates and housings, making a wide deep cut in
one pass.
Set at an angle the Dado Head can be used to make the
grooves for staircases (mitre position), long grooves and
rebates (rip position), and mortices or tenons (blade
horizontal).
There are two types of optional Dado Head available for
your machine (Fig. 47). The flat-ground type is the cheaper
of the two but is perfectly adequate for intermittent use.
The premium-quality Dado Head has a longer-life and is
resharpenable again and again for relatively intensive
Dado-ing. It is therefore correspondingly more expensive
than the first.
Mount the Dado Head as follows:
(i)
Remove the sawblade and its related flanges.
(ii)
Mount the special back spacer on the motor arbor
with the narrower side towards the motor,
(iii)
Mount the Dado Head on the shaft, having inserted
the necessary number of chippers or shims between
the two cutter sections to obtain the width of cut
required.
(iv)
Secure the Dado Head on the shaft with the standard
sawblade arbor nut (left-hand thread).
(v)
Mount the standard sawblade guard, having removed
the riving knife and its support bracket completely
from within the guard (Fig. 48).
(vi)
Then, by rotating the elevating handle lower the Dado
Head into position for the depth of cut required.
It may be necessary to place a supplementary table
on top of the standard worktable to raise the work
sufficiently depending on the depth of cut/thickness
of material.
Note: If you are dado-ing only in the crosscut or mitre
positions, the anti-kickback fingers on the back of
the guard should be adjusted up out of the way.
If, however, you are dado-ing in the rip position,
the direction of material feed is the same as for
sawing and the anti-kickback fingers must be
adjusted down so that their tips are "
e
" below the
surface of the material until the wood is fed
through, when the fingers should adopt the angle
illustrated in Fig. 23.
The basic machine if properly adjusted with a sharp blade
produces a clean cut that normally requires no further
finishing. For jobs needing a final sanding or having a
difficult shape, the two optional sander attachments can be
used for sanding cuts at any angle. The disc sander is
ideal for large scale flat sanding.
The disc sander mounts directly onto the spindle (Fig. 49).
(i)
Remove the sawblade guard and the blade itself,
(ii)
Return the outer sawblade flange to the spindle so
that both the inner and outer flanges are flat against
each other.
Fig. 46
Fig. 48
Fig. 49
21
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