ADJUSTING THE FEED PAWL:
The Feed Picker (59) height must be
adjusted to place the picker as far forward into the front face (hook) of the tooth as
possible. This ensures the picker does not have the opportunity to catch in the gullet or
high up the face of the tooth, causing irregular tooth placement to the grinding wheel.
The height of the picker is set by loosening the Clamp bolt (55) and turning the Height
Adjuster Tab around so it rests on the top of the rear plate while presenting the tooth
picker at the correct height into the tooth. Additionally a pawl guide is positioned below
the Pawl Arm (52) to minimise sideways movement. Loosening it’s retaining bolt, which
then allows the guide to be turned to a position to capture the pawl arm when in it’s
lowest position. It is generally preferable that the Feed Pawl Block (45) moves evenly
over an arc either side of vertical. To achieve this may require the picker protrusion
from the clamp to be lengthened or shortened relative to the Feed Pawl Arm (52).
The Feed Pawl Tooth Stroke must be set to the
pitch of the teeth. The teeth are indexed by means of an oscillating mechanism actuated by
a Feed Cam. The amount of movement (oscillation) imparted by the cam is governed by the
position of the Bearing along the slot of the Translator Arm.
Shifting the bearing (34) left (towards the
cam), decreases the total movement (oscillation) while moving it right (away from cam)
increases this movement.
The bearing (34) is secured to the
Translator arm by a bolt (32), which in turn is adjusted along the Translator Arm with a
5mm screw thread (64) actuated with a 4mm Hex. Key. Loosening the bolt and turning the
socket screw allows accurate adjustments to the bearing position to be achieved. A good
starting point is to have the picker return half way (50 to 60%) into the next tooth. For
example, a 25mm (1”) pitch blade will require a total stroke of 38mm (1 1/2”)
Increasing the tooth stroke allows the grinding wheel to go further down the tooth face
before the picker contacts the next tooth and moves the blade along. This lengthens the
face and gives a smaller radius to the throat (transition between the front face and the
gullet).see Fig. 12
