Cut two lengths of the plywood slightly oversize. Glue together to
produce a board 18mm thick. When dry trim to exactly 800 mm wide
this is important to get a correct O gauge of 7mm. Cut two pieces of the
aluminium to the same length as your base. Lay inverted one on each side
of the base, clamp and drill 6 off 4BA clearance holes per side through
both angle and base. Position these holes to allow you space to slide
the positions of the bearings to suit your stock.
Invert the board and countersink the holes you have drilled in the
wooden base. Insert the bolts from underneath and secure with
appoxy-resin. Re fit the angle pieces and secure lightly with plain nuts
and washers.
Next make the bearing supports by cutting 6 pieces of angle 35 mm long
and de-burr. Scribe a line 4 mm down from the top edge on each piece.
find the centre point of that line and mark 2 drilling points 6 mm to
left and right of this centre. Drill clearance holes for the 4BA bolts
that will secure the bearings. Fit the bolts from the inside with a
bearing then a washer then the angle followed by another washer and
locking nut. Tighten these just enough to remove any side play.
Position these completed bearings as required under the main angle to
suit your particular loco.
To complete the installation cut additional pieces of angle to support
bogie wheels and tender. Lubricate the bearings sparingly with light
machine oil
Power is supplied by connecting the angle at each side of the unit to
your controller.
Bearings were sourced from yellow-pages looking under "Engineering
and bearing supplies" and were 90 pence each for the ones
manufactured in China.
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