*_Relese Notes 8/e (A and B)
Drilling
_*1. The keylock hole has been pre drilled to make sure the art work
lines up
1.1 This hole has not been beveled inside as the method of doing it has
only just been devised and missed the panel run.
However the fix is not difficult. A fine grit conical grinding
wheel does the job with no damage to the panel.
2. The switch spindle hole has not been predrilled due to the following
issue:
2.1 DEC did an ECO to replace the selector switch.
Instead of six positions starting at 12 o'clock and steps
of 36deg
anticlockwise going to 6 o'clock. (A type panel) They
used a switch that started at 15deg
anti clockwise from top centre (12 o'clock) and that goes
in 30deg steps finishing 15deg short
of bottom centre (6 o'clock ).
Now the hole position no longer lies on the vertical line
between top centre and bottom centre.
Its offset to the right due to the crossing position having
moved due to the change of angle.
They then did something strange. They redrew the top and
bottom lines between the 15deg position
and what would have been the circle crossing point of the
original descending vertical line. That made it worse. In the end they
just drilled the hole very oversize and hid the line under the skirt of
the knob.
I only have a key and lamp board for an A type panel so I
can't tell if when they changed to the new
switch they moved it to the right to take care of the
change of angle.
So for B type I chose to draw the lines at the correct
angles.
A switch spindle located at the intersection of the lines
would then move through the correct angles
You can now drill the hole to suit your spindle position
Rod Smallwood
