101 Preparing the arm mounting board
Where the deck is not already cut to accept an
SME arm, it will need to be prepared as follows:
Pierce the centre point A of the mounting
template to accept a pin or needle about 50mm
long. Place the template on the record spindle
and keeping it parallel with the surface on which
the arm will be mounted pass the pin vertically
through the centre point A and spike it into the
pick-up mounting board.
102
Disengage the template from the spindle and
maintaining the same alignment slide it down
the pin and onto the mounting board. This will
position the base for maximum effective
movement when adjusting the horizontal
tracking angle (HTA), see 125. Anti-clockwise
rotation from this position up to approximately
40° can be made to meet individual needs but
is not critical provided that the requirements of
the alignment protractor can be satisfied. Note
that the rear overhang requires a 51mm radial
clearance from the point shown on the
template.
103
Using a scriber or a compass point, spike
through the centre points B and centres of the
four fixing holes. Remove the template and
mark two Ø28mm circles about the points B
already centred. Join these together
tangentially with two parallel lines to complete
marking out.
Drill four Ø4mm fixing holes and two Ø28mm
holes. Cut away the remaining area to form a
slot and finish the edges with a file and
glasspaper. If a hole saw is not available chain
drill a series of small holes around the inside of
the line, saw and file out.
With suitable tools and technique the procedure
is similar for materials other than wood.
9
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